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VILTech micro-controller
Operation and service manual
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Important Note:
Before applying power to the control panel, all wiring to the panel should be per NEC. Specifically check for
proper voltage and that the neutral is grounded at the source. An equipment ground should also be ran to
the panel.
*See W iring Instructions and Diagrams before proceeding.
Before start-up, enter all system values and options. See section on Setpoint Values.
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Table of Contents
Important Note: ......................................................................................................................................................................3
Domestic T erms and Conditions .......................................................................................................................................... 10
Export T erms and Conditions ............................................................................................................................................... 12
Chapter 1 .........................................................................................................................................................11
Spare Parts List .................................................................................................................................................................... 12
Pre-Startup Check List ......................................................................................................................................................... 13
Retrofit Kit Instructions ....................................................................................................................................................... 14
Operating Procedures .......................................................................................................................................................... 19
Definitions ........................................................................................................................................................................... 19
Keypad Functions ............................................................................................................................................................... 20
Main Screen Overview .........................................................................................................................................................22
Screen Types ....................................................................................................................................................................... 23
Menu Screens ...................................................................................................................................................................... 23
Menu Option Selection ........................................................................................................................................................ 24
Data Entry Screens .............................................................................................................................................................. 24
Cursors ................................................................................................................................................................................ 25
Data Entry Procedures ......................................................................................................................................................... 25
Data Screen Keys................................................................................................................................................................. 25
Field T ypes .......................................................................................................................................................................... 26
Selectable Fields .................................................................................................................................................................. 26
Numerical Data Input Fields.................................................................................................................................................26
Absolute Pressure Fields ..................................................................................................................................................... 27
Time Fields ........................................................................................................................................................................... 27
Date Fields ........................................................................................................................................................................... 27
String Fields ......................................................................................................................................................................... 28
T elephone Number Field ...................................................................................................................................................... 28
Hexadecimal Fields ............................................................................................................................................................... 28
Status Screens ..................................................................................................................................................................... 30
Confirmation Screens ........................................................................................................................................................... 31
Confirmation Screen Procedures..........................................................................................................................................31
Momentary Screens ............................................................................................................................................................. 32
Information Screens ............................................................................................................................................................. 33
Access Screens .................................................................................................................................................................... 34
Log Screens ......................................................................................................................................................................... 35
Alarms & Failures ................................................................................................................................................................ 36
Modes Of Operation ............................................................................................................................................................ 39
Chapter 2 .........................................................................................................................................................39
Compressor Controls ........................................................................................................................................................... 39
Starting the Compressor ...................................................................................................................................................... 40
Manual Start ........................................................................................................................................................................ 40
Automatic Start .................................................................................................................................................................... 40
Remote/Auto Remote Start .................................................................................................................................................. 41
I/O Control ........................................................................................................................................................................... 41
Network Control...................................................................................................................................................................41
Sequenced Start ................................................................................................................................................................... 41
Stopping the Compressor .................................................................................................................................................... 42
Manual Stop ........................................................................................................................................................................ 42
Automatic Stop .................................................................................................................................................................... 42
Remote/Auto Remote Stop .................................................................................................................................................. 42
I/O Control ........................................................................................................................................................................... 42
Network Control...................................................................................................................................................................42
Sequenced Stop ................................................................................................................................................................... 42
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Capacity Control .................................................................................................................................................................. 43
Manual Capacity Control ..................................................................................................................................................... 43
Automatic Capacity Control ................................................................................................................................................ 43
Control Groups .................................................................................................................................................................... 44
Cut-Out Setpoint..................................................................................................................................................................44
Cut-In Setpoint .................................................................................................................................................................... 44
Control Setpoint...................................................................................................................................................................44
Low Alarm/Failure Setpoints ................................................................................................................................................ 44
Time Proportional Control Strategy ..................................................................................................................................... 44
Control Deadband................................................................................................................................................................44
Normal Bandwidth ............................................................................................................................................................... 44
Normal Stage Delay .............................................................................................................................................................44
Fast Stage Delay - ................................................................................................................................................................ 44
Difference Above Setpoint .................................................................................................................................................. 45
Load Bandwidth...................................................................................................................................................................45
Unload Bandwidth ............................................................................................................................................................... 45
Difference Below Setpoint ................................................................................................................................................... 45
Remote Capacity Control ..................................................................................................................................................... 45
Auto-Remote Capacity Control............................................................................................................................................ 45
Sequenced Capacity Control ............................................................................................................................................... 46
Low Alarm and Failure Setpoints ......................................................................................................................................... 46
Running in Trim Mode.........................................................................................................................................................46
Running in Full Load Mode ................................................................................................................................................. 47
Anti-Cycle in Sequenced Mode...........................................................................................................................................47
Forced Unloading & Limiting............................................................................................................................................... 47
Ramp Start............................................................................................................................................................................47
Capacity Ramp Start Limiting ............................................................................................................................................... 48
Staging Setup....................................................................................................................................................................... 49
Minimum Capacity ............................................................................................................................................................... 49
Setpoint Scheduling.............................................................................................................................................................50
Daily Schedules .................................................................................................................................................................. 50
W eekly Schedule ................................................................................................................................................................. 50
Oil Pressure Computation ................................................................................................................................................... 50
Oil T emperature Regulation .................................................................................................................................................. 50
Anti-Cycle Timer .................................................................................................................................................................. 51
Power Fail Restart .............................................................................................................
Process T emperature Control (Option) ................................................................................................................................ 51
T wo Stage Configuration (Option).......................................................................................................................................51
Operational Procedures........................................................................................................................................................ 52
Status Screens ..................................................................................................................................................................... 54
Compressor Main Status Screen..........................................................................................................................................54
Status Banner....................................................................................................................................................................... 55
Current System State ........................................................................................................................................................... 56
CURRENT ST A TE DESCRIPTION ....................................................................................................................................... 56
Mode Area ........................................................................................................................................................................... 56
MODE DESCRIPTION ......................................................................................................................................................... 56
Alarm & Failure Area ........................................................................................................................................................... 57
ALARM SYSTEMS ST A TUS .............................................................................................................................................. 57
MESSAGE ............................................................................................................................................................................ 57
Operating Hours Screen.......................................................................................................................................................57
TERM DEFINITION ............................................................................................................................................................. 57
Active Alarms & Failures S tatus Screen .............................................................................................................................. 58
Active Alarms & Failures S tatus Screen Definitions ........................................................................................................... 58
Active Alarms & Failures S tatus Screen .............................................................................................................................. 58
Auto-Start Warning Screen.................................................................................................................................................. 59
................................................... 51
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SETPT Hot Key.................................................................................................................................................................... 59
AUTO Start Warning Screen............................................................................................................................................... 59
SETPT Hot Key Screen ....................................................................................................................................................... 59
Setpoints............................................................................................................................................................................. 60
Pressure Setpoints ............................................................................................................................................................... 61
Suction Pressure Control Groups......................................................................................................................................... 61
High Suction Pressure Setpoints ......................................................................................................................................... 63
Discharge Pressure Setpoints .............................................................................................................................................. 64
Oil Pressure Setpoints..........................................................................................................................................................65
Intermediate Pressure Setpoints (T wo Stage only) Option .................................................................................................. 66
T emperature Setpoints ......................................................................................................................................................... 67
Discharge T emperature Setpoints ........................................................................................................................................67
Oil T emperature Setpoints....................................................................................................................................................68
Process T emperature Control Group .................................................................................................................................... 69
High Process Temperature Setpoints ................................................................................................................................... 70
Note Page............................................................................................................................................................................. 71
Capacity Setpoints...............................................................................................................................................................72
Scheduling ........................................................................................................................................................................... 73
Control ................................................................................................................................................................................. 73
Active Group ....................................................................................................................................................................... 74
Active Schedule...................................................................................................................................................................74
W eekly Schedule ................................................................................................................................................................. 75
Daily Schedule ..................................................................................................................................................................... 75
CAP Control.........................................................................................................................................................................77
Suction Pressure Control Setpoints ..................................................................................................................................... 77
Process Temperature Control Setpoints...............................................................................................................................78
MISC Control ....................................................................................................................................................................... 79
LOGS Hot Key ..................................................................................................................................................................... 80
MENUS Hot Key ................................................................................................................................................................. 80
Chapter 3 .........................................................................................................................................................81
Logging Functions T echnical overview............................................................................................................................... 81
Logging Functions .............................................................................................................................................................. 81
Trend Log ............................................................................................................................................................................ 82
Alarm Log ............................................................................................................................................................................ 82
Failure Log ........................................................................................................................................................................... 82
User Log .............................................................................................................................................................................. 82
Logging Functions Operating Procedures...........................................................................................................................83
Operations and Trend Logs ................................................................................................................................................. 84
Alarm and Failure Logs ........................................................................................................................................................ 85
User Log .............................................................................................................................................................................. 86
Clear Logs ............................................................................................................................................................................ 86
Clear All Logs.......................................................................................................................................................................87
Set Log Rate.........................................................................................................................................................................87
Logon User .......................................................................................................................................................................... 89
Logoff User .......................................................................................................................................................................... 89
Automatic Log Off ............................................................................................................................................................... 89
Chapter 4 .........................................................................................................................................................89
Menu Functions .................................................................................................................................................................. 89
Set-up Menu ........................................................................................................................................................................ 91
Set Clock .............................................................................................................................................................................. 91
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Calibrate Sensors ................................................................................................................................................................. 91
Dynamic Sensor Calibration.................................................................................................................................................91
Static Sensor Calibration......................................................................................................................................................91
Passwords............................................................................................................................................................................ 92
Adding/Deleting Users ........................................................................................................................................................ 92
Screen Access Levels .......................................................................................................................................................... 92
Initialization..........................................................................................................................................................................92
Power Fail Reset...................................................................................................................................................................92
Set Factory Configuration....................................................................................................................................................93
Configuration ....................................................................................................................................................................... 93
Display ................................................................................................................................................................................. 93
Communication .................................................................................................................................................................... 93
Set Operating Status ............................................................................................................................................................ 93
Staging Configuration..........................................................................................................................................................93
Control Configuration .......................................................................................................................................................... 93
Adjust Contrast ................................................................................................................................................................... 93
Operational Procedures........................................................................................................................................................ 94
Logon User .......................................................................................................................................................................... 95
Logoff User .......................................................................................................................................................................... 95
Diagnostics .......................................................................................................................................................................... 96
System Information .............................................................................................................................................................. 96
View Discrete I/O ................................................................................................................................................................. 97
View Analogs ....................................................................................................................................................................... 98
Communication Status ....................................................................................................................................................... 100
Override Discrete I/O ......................................................................................................................................................... 101
Set-up................................................................................................................................................................................. 102
Set Clock ........................................................................................................................................................................... 102
Calibrate Sensors ............................................................................................................................................................... 103
Dynamic Sensor Calibration............................................................................................................................................... 104
Static Sensor Calibration.................................................................................................................................................... 105
Password Control............................................................................................................................................................... 106
Password Control Screen ................................................................................................................................................... 106
Add/Delete User ................................................................................................................................................................ 107
Access Levels .................................................................................................................................................................... 108
Initialization........................................................................................................................................................................ 109
Power Fail Reset...............................................................................................................
Set Factory Config ............................................................................................................................................................. 110
Setpoint Save/Restore ....................................................................................................................................................... 110
Save/Restore Status ........................................................................................................................................................... 110
Configuration ..................................................................................................................................................................... 111
Display ............................................................................................................................................................................... 111
Comm Setup ....................................................................................................................................................................... 112
Set Op Stats ....................................................................................................................................................................... 113
Setup Stages ...................................................................................................................................................................... 114
Control Configuration ........................................................................................................................................................ 115
Adjust Contrast ................................................................................................................................................................. 115
V ariable Frequency Drive Option....................................................................................................................................... 116
.................................................. 109
Sequencer Control ........................................................................................................................................118
Sequencer T echnical Section ............................................................................................................................................. 118
Sequencer System Control Parameters .............................................................................................................................. 119
Sequencer Staging Control ................................................................................................................................................ 119
Difference Above Setpoint ................................................................................................................................................ 120
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Load Bandwidth................................................................................................................................................................. 120
Unload Deadband .............................................................................................................................................................. 120
Unload Bandwidth ............................................................................................................................................................. 120
Sequencing Commands...................................................................................................................................................... 120
System Control Parameter and Setpoint Communication ................................................................................................... 120
Sequencer Operations........................................................................................................................................................ 121
Sequencer Lead List........................................................................................................................................................... 121
Enabling and Disabling the Sequencer .............................................................................................................................. 124
Sequencer Control Groups................................................................................................................................................. 124
Sequencer Setpoint Scheduling ......................................................................................................................................... 124
Alarm and Failure Setpoints............................................................................................................................................... 125
Setting up VIL Tech Panels for Sequencing ........................................................................................................................ 125
Sequencer Operating Procedures....................................................................................................................................... 126
Sequencer Status Screen ................................................................................................................................................... 126
SEQ Hot Key ...................................................................................................................................................................... 127
LEAD LIST ........................................................................................................................................................................ 127
CNTRL GROUP SELECT .................................................................................................................................................... 127
SCHEDULING .................................................................................................................................................................... 127
SCHEDULE SETUP ............................................................................................................................................................ 127
DAIL Y SCHEDULE ............................................................................................................................................................ 127
SCHEDULE 01 .................................................................................................................................................................... 127
SCEHDULE 02 .................................................................................................................................................................... 127
SCHEDULE 07 .................................................................................................................................................................... 127
HIGH ALARM ................................................................................................................................................................... 127
LEAD LIST A ..................................................................................................................................................................... 127
LEAD LIST B ..................................................................................................................................................................... 127
CURRENT ACTIVE LEAD LIST ........................................................................................................................................ 131
Control Group Select .......................................................................................................................................................... 132
CO NT ROL SE TPT.............................................................................................................................................................. 132
LOW ALARM.................................................................................................................................................................... 132
LOW F AILURE .................................................................................................................................................................. 133
Schedule Setup .................................................................................................................................................................. 133
Daily Schedules ................................................................................................................................................................. 134
SCHEDULED TIME ........................................................................................................................................................... 134
SELECTED GROUP ............................................................................................................................................................ 134
SELECTED LEAD .............................................................................................................................................................. 134
LIST ................................................................................................................................................................................... 134
High Alarm ......................................................................................................................................................................... 135
Addendum for Pump Down Program for VIL T ech.............................................................................................................. 136
APPENDIX A ............................................................................................................................................... 139
Alarm and Failure Data ...................................................................................................................................................... 139
Analog Alarms ................................................................................................................................................................... 139
High Suction Pressure ....................................................................................................................................................... 139
Low Suction Pressure ........................................................................................................................................................ 139
High Discharge Pressure ................................................................................................................................................... 139
High Oil T emperature ......................................................................................................................................................... 139
Low Oil Pressure ................................................................................................................................................................ 139
Low Intermediate T emp(T wo Stage)................................................................................................................................... 139
High Process T emperature(Option).................................................................................................................................... 139
Low Process T emperature(Option) .................................................................................................................................... 139
High Intermediate Pressure (T wo Stage)............................................................................................................................ 140
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Low Intermediate Pressure (T wo Stage)............................................................................................................................. 140
Discrete Alarms .................................................................................................................................................................. 140
APPENDIX B ............................................................................................................................................... 141
Analog and Discrete I/O .................................................................................................................................................... 141
Analog Inputs .................................................................................................................................................................... 141
APPENDIX C ............................................................................................................................................... 143
Communication Protocols.................................................................................................................................................. 143
Introduction ....................................................................................................................................................................... 143
Applicable Documents ...................................................................................................................................................... 143
Hardware Interface Description ......................................................................................................................................... 144
Hardware Requirements ..................................................................................................................................................... 144
Interface Connections........................................................................................................................................................ 144
Pin Name ............................................................................................................................................................................ 144
Message Addressing ......................................................................................................................................................... 146
Software Interface Description .......................................................................................................................................... 148
Protocol Overview ............................................................................................................................................................. 148
Status Only or Status and Control Options ....................................................................................................................... 148
Message Categories .......................................................................................................................................................... 148
MODBUS Protocol Description ......................................................................................................................................... 149
Preset Single Register ........................................................................................................................................................ 150
Preset Multiple Registers ................................................................................................................................................... 150
Error Messages .................................................................................................................................................................. 151
Data Formats...................................................................................................................................................................... 151
Status Message Description.............................................................................................................................................. 152
Analog Input and Computed Parameters ........................................................................................................................... 152
Discrtete Input and Outputs .............................................................................................................................................. 153
Alarm and Failure Data ...................................................................................................................................................... 154
Equipment Data.................................................................................................................................................................. 157
Alarm Status T able............................................................................................................................................................. 157
Compressor Mode Table .................................................................................................................................................... 157
Compressor State Table ..................................................................................................................................................... 158
Last RECIP Start S tatus T able ............................................................................................................................................ 160
Control Message Description ............................................................................................................................................ 160
Network in Control Command ............................................................................................................................................ 161
Compressor Start/Stop....................................................................................................................................................... 161
Set Comressor Capacity Command .................................................................................................................................... 162
Change Compressor Mode Command ............................................................................................................................... 162
Acknowledg/Clear Active Alarm Command ....................................................................................................................... 163
Change Current Setpoint Group Command ........................................................................................................................ 163
Change Control T ype Command ........................................................................................................................................ 163
Auto Start/Stop Contol Command ..................................................................................................................................... 163
Suction Pressure Setpoint Message Description............................................................................................................... 164
Process Temperature Setpoint Message Description ........................................................................................................ 165
APPENDIX D ............................................................................................................................................... 166
Condensor Control ............................................................................................................................................................ 166
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Notes Page
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Spare Parts List
QNTY Part# Item
1 3400A Microcontroller Board
1 3400B I/O (Digital and Analog) Board
1 3400C Display Interface Board
1 3400CG 240x128 Liquid Crystal Display
1 3400F Controller Fuse Pack Consisting of 1-15amp main, 3-5amp I/O
1 400K Controller Power Supply
2 3400M 120VAC Solid State Output Module
2 3400N 120VAC Solid State Input Module
1 3400R EEPROM
1 3400Y Cable Kit (incl display cable, p.s. to main, p.s. to I/O bd)
1 2611N DETECTOR -58/122DEG TEMP RESIST 4-20MA
1 2611P DETECTOR 32/392DEG TEMP RESIST 4-20MA
1 2783D2 TRANSDUCER AKS33 0-414.5PSIA 4-20MA OUT
1 2783D4 TRANSDUCER AKS33 0-200PSIA 4-20MA OUT
2 3122B CORDSET RK4T -4/S618 TURCK
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Chapter 1
Pre-Startup Check List
Pre-Wired done at factory . The necessary field wiring connections are described below.
1. Connect power (L1) to e-stop at terminal #2. Then neutral is connected on TB5 to the
middle terminal labeled “N”. Last connect ground on TB5 at the right end terminal
labeled “G”.
2. Connect the Compressor Motor to Channel 1, the hot lead connects to terminal 4 and
the neutral end to terminal 1.
3. Connect the Motor Starter AUX to Channel 9. The hot side of the dry contact to
terminal 34. The neutral side of the dry contact to terminal 35.
4. At this time connect AUX #1, AUX #2, Remote Start/S top, or water solenoid that
may have shipped loose per the wiring diagram.
5. First, press “Menu” key then press “#1” then next press “clear” now enter the password “999999”. Then enter setpoints by pushing “SETPT” key then #2 for Setpoints.
Now go through each screen for 1.Pressure, 2.T emperature, and 3.Capacity . Use the
“QUIT” or “SA VE” button to go to previous screen.
6. Still under “Setpt” screen setup Capactiy Control by pressing #4 and Misc Control by
pressing #5. If multiple control setpoints are going to be used then setup a Schedule by
pressing #3, please read the manual for more information.
7. Now press the “Menu” button then press #4 “System Setup” then #5 “Configure
Hardware” then #4 “Staging Configuration”, now on this screen please make sure that
the correct steps of unloading are shown on the right side of the screen, if the steps are
not correct then look in the manual or call Electrical Engineering at V ilter Manufacturing LLC. Now to get out of this screen press “Quit” key if no changes were done
otherwise press “Save” to get to the previous screen.
8. Next press #5 “Control Configuration” and verify the refrigerant and enable/disable
any options that are needed or not.
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Chapter 1
Retrofit Kit Instructions
Belt Drive
MountatMotorEnd of Unit
DirectDrive
Mount Suction Side of Unit
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WARNING
D
ONOTR
UNACand
DCw
Do not bring in or run any
wiring on top of panel.
Do not run DC voltage on
thesamesideasthe
AC Voltage.
All120V w ires must enter
the lower right corner of
panel o r all w arranties
will be void.
ires
TOGETH ER!!!
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NOTES:
1) CONNECT ALL SENSOR DRAIN WIRES AT THIS
LOCATION.
2) DOTTED WIRING REPRESENTS FIELD WIRING
3) DOTTED COMPONENTS NOT BY VILTER
4) FOR NEMA 3, 3R, 4 & 12 PANELS, ALL OPENINGS TO
BE GASKETED.
5) MOTOR STARTER WIRING WILL VARY. REFER TO
STARTER MANUFACTURER‘S DIAGRAM FOR ACTUAL
WIRING.
6) ALL CONDUIT CONNECTIONS TO THE PANEL MUST
BE MADE WITH FLEXIBLE CONDUIT.
7) FUSE 5 AMP FAST BLOW.
8) ONLY (4) FOUR INCHES OF SIGNA WIRES SHOULD
BE UNSHIELDED AT SENSOR END.
9) CABLE FOR ANALOG DEVICES UNLESS SHOWN
OTHERWISE IS BELDEN #9533 OR EQUIVALENT. 24
AWG, 3 CONDUCTOR, SHIELDED WITH DRAIN WIRE,
RUN IN SEPARATE CONDUIT FROM POWER WIRING.
MAX WIRE SIZE FOR TERMINAL IS #14AWG. USE
COPPER CONDUCTORS ONLY WITH TEMPERATURE
RATING 60°C OR HIGHER. TIGHTENING TORQUE 4 LBIN.
10) MAXIMUM TOTAL SENSOR DRAW IS 2 AMPS. IF
GREATER THAN 2 AMPS IS REQUIRED CUSTOMER
SUPPLIED POWER SUPPLY IS REQUIRED. CONSULT
MANUFACTURER FOR DETAILS.
11) MAX WIRE SIZE FOR I/O BOARD TERMINAL IS
#12AWG. USE COPPER CONDUCTORS ONLY WITH
TEMPERATURE RATING 60°C OR HIGHER. TIGHTENING TORQUE 4 LB-IN MAXIMUM CURRENT FOR FORM
C RELAY IS 4 AMPS MAXIMUM CURRENT FOR SOLID
STATE OUTPUT MODULE IS 1.5 AMPS.
12) DRAWING IS SHOWN WITH INTERNALLY SUPPLIED
POWER ALTHOUGH IT IS CONFIGURABLE TO CUSTOMER SUPPLIED POWER.
13) 120 VAC OUTPUTS MAX. LOAD: 1.5 AM RUNNING,
30 AMPS INRUSH.
14) MAX WIRE SIZE FOR INPUT POWER TERMINAL IS
#10AWG. USE COPPER CONDUCTORS ONLY WITH
TEMPERATURE RATING 60°C OR HIGHER. TIGHTENING TORQUE 4.4-5.3 LB-IN.
15) CABLE FOR COMMUNICATION BETWEEN PANELS
OR COMPUTER IS BELDEN #9843, OR EQUIVALENT. 24
AWG, 6 CONDUCTOR, TWISTED PAIR SHIELDED WITH
DRAIN WIRE, RUN IN SEPARATE CONDUIT FROM
POWER WIRING.
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Chapter 1
General Operating Procedures
Definitions
Cursor is a field indicator used on data entry screens. There are four possible cursor types:
* represents a number field input
> represents a selectable field
“ represents a string field
X represents a hexadecimal field
The cursor shows the user which fields are changeable on a data entry screen.
Display Area is the part of the LCD display that shows system information. The display area will
vary in size depending on whether a large character or small character screen is being viewed.
Fields are places where the user enters control parameters.
Highlight is when the letters appear light on a dark background instead of dark on a light back-
ground. The highlighted area may flash from light to dark to stress its importance and to gain the
user’s immediate attention.
Hot Keys are the top-level system functions and menus. The hot keys are located in a column to the
left of the Display area.
Large Character Screens are screens that use large, double high characters and also contain the
title banner and hot keys.
Main Status Scr een is a large character status screen, which is considered the main system status
screen. This screen will also contain the alarm status, mode, and state of the system.
Parameter is a system control value, which is displayed by the system or input by the user.
Examples are suction pressure and high suction pressure alarm setpoint.
Screen is a method of displaying information to the user. The system contains eight types of
possible screens: menu screens, data entry screens, status screens, confirmation screens, momentary screens, information screens, access screens, and log screens
Small Character Screens utilize the entire LCD display and use small characters to show system
information. These screens do not display the system hot keys.
T oggle is the process of moving from one selectable choice to the next by using the ENTER key.
User is an individual or group of individuals who will use the system. A user is identified by a user
number ranging from 1 to 10. The user may also be referred to as the operator in this document.
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Keypad Functions
The following is a brief summary of the V iltech keypad along with a description of its individual keys. Below
is a drawing of the V iltech keypad layout.
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Keypad Diagram
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STOP The red STOP key causes an immediate and orderly shutdown of a compressor. This key
usually has no effect on master panels.
0 – 9 The NUMBER keys select menu or hot key options. On data entry screens the number keys
are used to enter numerical data.
• The DOT key allows decimal point entry on data entry screens. This key also permits the
user to page forward one full screen at a time on log and status screens.
_ The MINUS key allows negative number entry on data entry screens. This key also permits
the user to page back one full screen at a time on log or status screens.
On data entry or menu screens, the UP ARROW key moves the cursor up to the next item on the
screen.
On data entry or menu screens, the DOWN ARROW key moves the cursor down to the next item on
the screen.
On data entry or menu screens, the LEFT ARROW key moves the cursor left to the next item on the
screen. This key also permits the user to page forward one full screen at a time on log and status
screens.
On data entry or menu screens, the RIGHT ARROW key moves the cursor right to the next item on
the screen. This key also permits the user to page back one full screen at a time on log and status
screens.
PG UP The PG UP key is used to page back one full screen at a time for status screens or to page up
to more current data on log screens.
PG DN The PG DN key is used to page forward one full screen at a time for status screens or to page
down to older data on log screens.
QUIT The QUIT key exits the current screen and displays the previous screen. Pressing the QUIT
key to exit from a data entry screen will result all changed data being lost.
SA VE The SAVE key is used with data entry screens to save any changed information. It also exits
the current screen and displays the previous screen.
CLEAR The CLEAR key within data entry screens will erase the current number field. On the main
status or alarm status screen it acknowledges and clears alarms and failures.
ENTER The ENTER key is used within data entry screens on a number field to accept numerical data
or on a selectable field to toggle through the available choices. On menu screens, the ENTER key will
select the highlighted menu item. The ENTER key may also be used to scroll forward through the
status screens.
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Main Screen Overview
Display Area
The MAIN SCREEN is the name for a set of features common to all large character screens.
The Main screen is broken down into two areas: the Display Area, and the Title Banner .
The following drawing shows a representation of the main screen layout and labels each of
its various areas.
Title Banner
Title Banner -The top highlighted bar contains the V ilter logo and the current time of day and
may only be found on large character screens.
Display Area -Contains all of the detailed screen information. Large character screens will use
only the designated display area, while small character screens use the entire LCD display.
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Main Screen Layout
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Screen Types
Viltech information is presented to the operator using eight different types of screens. The
different SCREEN TYPES each use specific data entry and control procedures. The screen
types let the user know which screen type heading to refer to for information on the specific
screens’ procedures. The following is a list of the eight different screen types.
Menu Screens
Menu Screen - displays a numbered list of options.
Data Entry Screen - used to modify system control parameters.
Status Scr een - displays real-time system summary data.
Confirmation Screen - used for verification, gives a choice for a yes or no option.
Momentary Screen - displays a message for three seconds.
Information Screen - used to display system information
Access Screen -a menu type screen with an number input field.
Log Screen - displays a record of system parameters and actions.
The MENU screen is used to present the user with choices for various system
operations. Menu screens are found throughout the Viltech system. The following is
an example of a menu screen.
Menu Screen
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The following table contains a list of the active keys on a menu screen and their function.
KEYS FUNCTION
NUMBER Used to choose a selection number.
KEYP AD
ENTER Used to choose the selection number that is highlighted.
UP/DOWN Moves the cursor from one selection to the next either up or down.
ARROW
QUIT Exits from current screen to the previous screen.
Menu Screen Keys Table
Menu Option Selection -Use the number keys corresponding to the desired menu item
or the arrow keys and press ENTER to select the desired menu item.
Data Entry Screens
DA T A ENTRY SCREENS are user interactive screens, which allow the user to change
or input system data. These screens contain a special cursor to signify the field type
at the cursor location. The cursor can be moved throughout the screen to indicate
each field location.
NOTE: Data entry screens may also contain information for reference purposes that is
not changeable. The following is an example of a data entry screen.
Data Entry Screen
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The following table contains a list of the active keys on a data entry screen and their function.
KEYS FUNCTIONS
NUMBER Used to enter numerical data.
KEYP AD
ENTER Toggles through the available choices on a selectable field. On a number field the
ENTER key is used to accept entered data and move to next field.
ARROW KEYS Moves the cursor from one field to the next either up, down, left or right. Any of the
arrow keys can also be used to accept the data entered on a number field.
CLEAR Will clear the current numerical field. The CLEAR key is not active on selectable
fields.
SA VE Exits from the current screen and all new data is saved.
QUIT Exits from the current screen and all new data is lost.
Data Screen Keys
A data entry screen may contain both numerical input and selectable fields, which are identified by
different cursors as shown in the following table.
Cursors
> Selectable cursor, indicated a selectable field.
* Numerical input cursor, indicates a number field.
Data Entry Screen Cursor Table
Data Entry Procedures
1. V erify Screen Type - One of the special cursors must appear on the screen. If
the cursor did not appear you are not on a data entry screen.
2. Change Fields - Use the arrow keys to move the cursor to the desired field.
3. Enter Data - Enter the desired numerical data or select the desired selectable
depending on field type.
4. SAVE OR QUIT - Upon completing the changing of data the user may press
SAVE to save all newly entered data and return to the previous screen. If the user
presses QUIT the entered data will not be saved. After pressing QUIT,
confirmation screen will ask the user to verify the desire to lose all changes
entered.
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Field Types
This section discusses the procedures used to work with each of the FIELD TYPES as well as the general
procedures that apply to all number entry fields. The following information applies to any field when entering
numerical data:
Decimal Number Entry -If the data you wish to enter has a zero in the decimal place there is no need to enter “0.”
Simply enter the whole number value.
Arrow Keys - The arrow keys will accept the entered data and move the cursor to the next field.
Errors - The flashing error message tells the user that the entered data is not within an acceptable range for the
field. The user must clear the error before proceeding. To clear an error message the operator presses the CLEAR
key .
Restoring V alid Data -The user can clear and re-enter data from any field prior to leaving the field. If the arrow key
or the ENTER key is used to move off the field after it has been cleared, the previously entered valid data will be
restored to the field.
Selectable Fields
A SELECTABLE FIELD gives the user a choice of inputs from which to toggle
through and is recognized by the “>” cursor preceding it.
1. V erify Cursor T ype - locate the “>” selection cursor .
2. ENTER Key - cycles the user through the available selections.
3. Arrow Keys - move to the next field and accept the selection.
Numerical Data Input Fields
A numerical field is used to enter control data and is recognized by the “*”
cursor preceding it.
1. V erify Cursor T ype - locate the “*” numeric input cursor.
2. Number Keypad - press the number keys that correspond to the number you wish displayed. Use the
decimal and minus keys where applicable. Each field will limit the user to a maximum number of whole and
decimal numbers for that specific field.
3. ENTER/Arrow Keys -move to the next field and accept the entered number .
4. V erify Cursor T ype - Upon pressing the ENTER or DOWN ARROW key , if the cursor moves across to
the units column and changes to the “>” selectable cursor, the user is in a suction pressure field which is
described in the next section.
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Absolute Pressure Fields
This field is actually a combination of numerical and selectable fields. The selectable or units section of the
field allows the user to adjust the units to select vacuum or non-vacuum ranges.
1. V erify Cursor T ype - locate the “*” numeric input cursor.
2. Number Keypad - press the number keys that correspond to the number you wish displayed. Use the
decimal and minus keys where applicable. If the numeric field already has the correct data and only the
units need to be adjusted, re-enter the existing numerical data and press ENTER.
3. ENTER/Arrow Keys - locks in the numerical data and moves the cursor across to the units section of
the field.
4. V erify Cursor Type - locate the “>” selection cursor next to the units section.
5. ENTER - cycles between possible units selections.
6. Arrow Keys - move to the next field and accept the entered data.
7. Errors -If an error occurs because the value entered is out of range the CLEAR key will clear the field
and return the user to the number portion of the field.
Time Fields
The TIME FIELD is a special case numerical field used to enter time data.
1. V erify Cursor T ype - locate the “*” numeric input cursor.
2. Number Keypad - use the number keys to enter the time you wish displayed. For example, to input the
time 5:59 press 0559, the system automatically moves from hours to the minutes. The “:” is automatically
entered in a time field. This field will allow for whole number acceptance. For example to set the time 8:00
the user may type 08 and press ENTER. The time on the screen will appear as 08:00.
NOTE:Time fields may be enter ed in 12-hour or 24-hour format depending on the system configuration. If the system
is in 12-hour format the user will be prompted to select “AM” or “PM” using a selectable field after a
number is entered.
Arrow Keys - move to the next field and accept the entered time.
3.
Date Fields
The DATE FIELD is a special case numerical entry field used o enter the date.
1. V erify Cursor T ype - locate the “*” numeric input cursor.
2. Number Keypad - use the number keys to enter the date you wish displayed. For example, to enter the
date 1/1/91 the user would type in 010191, the system automatically moves from the month to the day and
then to the year. The “/” slash symbol is entered for you.
3. Arr ow Keys - move to the next field and accept the entered date.
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String Fields
The STRING FIELD is a special case alpha-numeric entry field. It is similar to a selectable field but each character
in the string may be selected from the list of all possible letters, numbers, and special characters.
1. V erify Cursor T ype - locate the “ “ “ string input cursor .
2. Enter Key - Pressing the ENTER key first will clear the current contents and start entering characters.
The ENTER key is primarily used to cycle through the available selections for the current character
positions.
3. “+” Key - Selecting the Positive (.) key puts the field into edit mode and allows the current contents of
the field to be entered.
4. Arrow Keys - Allows you to move within a field to different characters.
5. Number Keys - These keys are used to enter numbers into a character.
6. Clear Key - This key is used to clear the content of the entire field.
7. Entering a space - If a space is allowed in the field, an “_” will be available in the character list.
Selecting this character will result in a space being inserted in the string. All trailing spaces are eliminated.
Telephone Number Field
The TELEPHONE NUMBER FIELD is a special case alpha-numeric entry field. It is similar to a string field but only
allows numbers and several special characters required for telephone numbers.
1. V erify Cursor T ype - locate the “ “ “ string input cursor .
2. Enter Key - Pressing the ENTER key first will clear the current contents and start entering characters.
The ENTER key is primarily used to cycle through the available selections for the current character
positions.
3. “+” Key - Selecting the Positive (.) key puts the field into edit mode and allows the current contents of
the field to be entered.
4. Arrow Keys - Allows you to move within a field to different characters.
5. Number Keys - These keys are used to enter numbers into a character.
6. Clear Key - This key is used to clear the content of the entire field.
7. Entering a space - If a space is allowed in the field, an “_” will be available in the character list.
Selecting this character will result in a space being inserted in the string. All trailing spaces are eliminated.
Hexadecimal Fields
The HEXADECIMAL FIELD is a special case alpha-numeric entry field. It is similar to a string field but only allows
numbers and several special characters required for hexadecimal numbers.
1. V erify Cursor T ype - locate the “ “ “ string input cursor .
2. Enter Key - Pressing the ENTER key first will clear the current contents and start entering characters.
The ENTER key is primarily used to cycle through the available selections for the current character
positions.
3. “+” Key - Selecting the Positive(.) key puts the field into edit mode and allows the current contents of
the field to be entered.
4. Arrow Keys - Allows you to move within a field to different characters.
5. Number Keys - These keys are used to enter numbers into a character.
6. Clear Key - This key is used to clear the contents of the entire field.
7. Entering a space - If a space is allowed in the field, an “_” will be available in the character list.
Selecting this character will result in a space being inserted in the string. All trailing spaces are eliminated.
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Status Screens
STATUS SCREENS are used to display a summary of significant system information. The
Main Status screen in a system is usually a large character text screen or graphics screen
and is the default screen displayed on the LCD. The Main Status screen will be replaced by
the Active Alarm and Failure screen when a new alarm or failure exists or by the Auto-Start
Warning screen if the compressor is online and ready to start.
The operator may view each of the system’s available status screens by scrolling through
using the ENTER, PG UP , PG DN, Right Arrow , or Left Arrow keys. The number of status
screens on a system will vary depending upon the individual system’s configuration.
Another feature of the system is that it will automatically return to the main status screen
after 10 minutes of no keyboard activity. Below is an example of a S tatus screen.
The following table contains a list of the active keys on a status screen and their function.
K E Y FUNCTION
ENTER Scrolls through the set of available status screens.
PG UP/PG DN
RIGHT/LEFT Pages forward or back through the available status screens.
ARROWS
QUIT Returns the user to the main status screen.
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Status Screen
Status Screen Keys
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Confirmation Screens
A CONFIRMATION SCREEN is used to ask the user to confirm a selection by answering a
question. This screen usually appears after the user has altered system parameters and
then presses the QUIT key or to verify a system control request. Below is an example of a
confirmation screen.
Confirmation Screen
The following table contains a list of the active keys on a confirmation screen and their
function.
KEYS FUNCTION
NUMBER Used to select a response number
KEYP AD
ENTER Used to select the highlighted response number.
UP/DOWN
ARROWS Moves the cursor from one selection to the next, either up or down.
QUIT Exits from the current screen to the pervious screen. Same as selecting
NO for most screens or YES when quitting from a data entry screen after
making changes.
Confirmation Screen Keys
Confirmation Screen Procedures
Number Keypad -Use the keypad to match your response with the numerical choices shown
on the screen or press QUIT to exit the screen.
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Momentary Screens
The MOMENTARY SCREEN is used to verify certain user selections by displaying an
informative message for three seconds. Rather than waiting for the entire three second time to
elapse, the operator may press the QUIT key to end viewing of the message. The following is
an example of a momentary screen.
Momentary Screen
The following table contains a list of the active keys on a momentary screen and their function
K E Y FUNCTION
QUIT Stops display of the message before the three second time limit expires.
.
Momentary Screen Keys
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Information Screens
INFORMATION SCREENS are used to display system data to the user. The information on
these screens may be real-time data, or a snapshot of data at the time the screen is first
displayed.
Information Screen
The following table contains a list of the active keys on an information screen and their
function.
K E Y FUNCTION
QUIT Exits from current screen to the previous screen.
Information Screen Keys
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Access Screens
The ACCESS SCREEN is used to index the user into a larger set of screens. This screen is
typically used in cases where more than eight screens are available for a particular option.
The access screen will perform error checking on the number entered. For example, if the
screen is used to access the daily schedules and the number eight is entered, the input area
will flash error since there are only seven possible schedules. The user will be required to
clear the error and enter a correct value. The data entry process is described in more detail in
the data entry section. The following is an example of an access screen.
Access Screen
The following table contains a list of the active keys on an access screen and their function.
KEYS FUNCTION
NUMBER Used to enter a number selection.
KEYP AD
ENTER Used to accept the selection number that is entered.
QUIT Exits from current screen to the previous screen.
Access Screen Keys
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Log Screens
LOG SCREENS are used to view recorded system information. The width and length of the
log screens may be wider and longer than allowed by the LCD display area. The arrow and
page keys can then be used to view the entire log. All systems are configured with the
following logs: Operation Log, Trend Log, Alarm Log, Failure Log, and User Log. Other
log types may also be included, depending on system options. Below is an example of a
log screen.
Log Screen
The following table contains a list of the active keys on a log screen and their function.
K E Y FUNCTION
PG UP Allows the user to page forward and back through the log entries.
PG DN PG UP shows more recent log entries and PG DN shows older log
entries.
UP/DOWN Scrolls line by line through the information. The Up arrow shows
ARROWS more recent log entries and the Down arrow shows older log
entries.
RIGHT/LEFT Scrolls to additional log pages while maintaining the same time and
ARROWS date for log entries.
CLEAR Returns the user to the beginning of the log.
QUIT Exits from current screen to the previous screen.
Log Screen Keys
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Alarms & Failures
The Viltech continually monitors the system parameters and compares them to ALARM AND FAILURE setpoints
to inform the operator of the system status. An alarm is intended to alert the operator that an undesirable
condition exists. A failure is an indication that a more severe system condition exists and may cause the system or
component to shutdown. The system parameters are compared to both operator-defined setpoints and Vilter
Manufacturing, LLC. safety setpoints. An alarm or failure is detected when a system parameter is outside the
acceptable range of the setpoints.
Certain alarms and failures may also be suppressed under specific conditions. For example, the low oil pressure
alarm is suppressed when the compressor is not running. Additionally, the detection of certain alarms and failures
can be delayed. For example, the low suction pressure failure is delayed for 10 seconds, in other words the suction
pressure must be below the low failure setpoint for 10 consecutive seconds before the system is shutdown.
Some alarm and failure setpoints are assigned factory default values, which may not be changed by the operator.
These are called OEM safety setpoints and typically indicate a condition that may cause damage to the equipment.
A detailed list of all system alarms and failures can be found in Appendix A.
When an alarm or failure is detected the sequence of operations is as follows:
The equipment controlled by the V iltech may be stopped, as in the case of a compressor, when a failure occurs.
The alarm or failure is entered into the active alarm and failure list and the current status screen on the
display is replaced with the active alarm and failure screen.
An entry is made in the appropriate alarm or failure log.
A special entry is made in the operation and trend logs listing the parameter values at the time of the alarm or
failure.
The current alarms and failures present on a system can be viewed on the active alarms & failures status screen.
The operator must acknowledge and clear alarms/failures from this screen or the main status screen using the
procedures covered in this section.
When a new alarm or failure becomes active, the Active Alarm & Failure status screen will be displayed as the
default status screen. The user can view all of the active alarms by scrolling through the alarms using the up and
down arrow keys. An example of the alarm & failure status screen is shown on the next page.
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Active Alarms & Failures Status Screen
The active function keys for this screen are described in the following table.
K E Y FUNCTION
UP/DOWN Scrolls line by line through the information.
ARROWS
CLEAR The CLEAR key is used to acknowledge and clear alarms/failures as well
as to silence the alarm horn.
Alarms & Failures Screen Keys
Use the following steps to acknowledge and clear any alarms & failures.
1. V erify Screen Type - The Alarm & Failure status screen or the Main Status
screen should be displayed.
2. Acknowledging an Alarm or Failure - Press the CLEAR button. When the
CLEAR button is pressed the previously flashing ALARM or FAIL in the lower
right-hand corner of the screen will stop flashing and go to a constant highlight.
This action will also deactivate the alarm or failure discrete output. When multiple
alarms are active the acknowledging function operates on the entire set of active
alarms or failures.
3. Correct Problem -The operator must now correct the problem causing the alarm
or failure. This may be a control parameter that is out of range, or various other
conditions which should be familiar to the operator.
4. Clear Alarm or Failure - Once the problem is rectified press the CLEAR button
on the keypad. The Alarm & Failure status area should become non-highlighted
and display the word NORM, the entry in the active alarm list will also be removed.
The clearing of each alarm is processed when the conditions causing the alarm are
acceptable.
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Chapter 2
Compressor Controls
The following sections discuss the standard and optional features contained in the Viltech RECIP
package.
Modes Of Operation
The RECIP Compressor package has several modes of operation. The mode is changed by using the
MODE key and making a selection from the Operation mode menu. The modes of operation are as
follows:
1. Manual - Starting, Stopping and Capacity Control are all performed manually .
2. Automatic - S tarting and Stopping can be performed manually or automatically based on Suction
Pressure or Process T emperature. Capacity Control is performed automatically to maintain a specific
control setpoint.
3. Remote - Starting, Stopping and Capacity Control in the Remote mode can only be performed from a
remote computer.
4. Auto-Remote - Similar to the Automatic mode except starting and stopping are performed using the
external Remote Start/Stop input or messages from a remote computer. The setpoint group can only be
selected from a remote computer.
5. Sequenced - This mode is utilized when two or more compressors are being used to control the same
load.
NOTE: The Remote, Auto-Remote, and Sequenced modes are available as system options.
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Starting the Compressor
The sequence that the RECIP compressor goes through during a start is as follows.
1. A five second minimum start delay timer is started. During this time, the capacity stages are unloaded,
the logs are enabled, and any discrete I/O overrides are cleared. The compressor is now in the
STARTING state.
2. After the five second timer expires, the motor is started, the Cooling Control output is ener gized, and a
15 second up-to-speed timer is started. The user-programmable anti-recycle timer is also started at this
time.
3. If the motor starter auxiliary contact closes within 15 seconds, the starting sequence will continue.
Otherwise, the compressor will be shutdown. Also, low oil pressure alarms will be inhibited within the 25
seconds, pressure failure will be inhibited within 30 seconds.
4. When the 15 second up-to-speed timer expires, the compressor will be loaded to a point greater than or
equal to the Minimum Capacity setpoint using the Fast Stage Delay Time between stages.
5. Once the compressor has loaded to minimum, the compressor transitions to the RUNNING state.
Normal capacity control can now begin.
The RECIP Compressor can be started manually, automatically, or remotely based on the operating mode chosen.
The compressor will not start in any mode if a failure condition exists.
Manual Start
MANUAL START is accomplished by selecting the MAN key. A manual start is used in Manual
mode.
Automatic Start
In AUTOMATIC START the compressor can be started automatically based on suction pressure or
process temperature. Automatic Starting is enabled on the Miscellaneous Control screen under the
SETPT hot key. Once the Auto Start/Stop feature is enabled, the operator must place the compressor
on-line using the Auto key. If the compressor is not needed at that time, it will immediately go to the
Cut-Out state and will start automatically whenever required. If the control parameter is already
above the Cut-In set-point, the compressor will start immediately. A failure or manual stop will take
the compressor off-line.
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Remote/Auto Remote Start
I/O Control
The REMOTE START/STOP input is used to start and stop the RECIP compressor in the Auto-Remote
mode only. The compressor must first be placed on-line by the operator through the use of the
key. Once the compressor is on-line, the Remote Start/Stop input may be energized to start the
compressor. When the input is de-energized, the compressor will stop but remain on-line. A failure or
manual stop command will stop the compressor and force it off-line.
NOTE: Before the remote location can control the system, the user must set the operating mode, and place the RECIP
compressor on-line using the RMT hot key . Then, and only then, is the system ready to accept remote contro l
signals.
RMT hot
Network Control
When the NETWORK CONTROL option is enabled, starting in the Remote or Auto-Remote mode is
performed using messages from a remote computer. It is required that the compressor be placed on-line
via the keypad or using an on-line message. For more information on Network Operation, please refer
to Appendix C.
Sequenced Start
In SEQUENCED START, the compressor takes commands from an V iltech Master Sequencer Control Panel.
The Sequenced mode can be selected from the operating modes. Once this mode is selected the RECIP
compressor must be placed on-line by using the SEQ hot key. Only when the RECIP compressor is placed online will the V iltech respond to control signals from the master sequencer .
Sequenced in Remote Start
The VILT ech panel can be controlled remotely and also be in sequence with other VILTech panels. In the
Sequencer Setup screens, this option can be enabled in the Control screen by choosing “Automatic”.
Once this mode is selected the RECIP compressor must be placed on-line by using the SEQ hot key. Now
all other panels in the sequence must be placed on-line by using the SEQ hot key otherwise the master
panel will not be able to communicate to the slave panels.
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Stopping the Compressor
The stopping sequence is as follows:
1. The Motor is stopped, the capacity stages are unloaded, and Cooling Control outputs are deenergized.
2. When the motor starter auxiliary contact opens within 15 seconds, the compressor will transition to the
STOPPED state.
3. Once the compressor is stopped, oil temperature regulation may begin using the Oil Heater output and
Oil T emperature input.
The RECIP compressor can be stopped manually or automatically depending on the operating mode. Any failure
will automatically stop the compressor.
Manual Stop
A MANUAL STOP is accomplished by using the stop button on the Viltech panel. The stop button
is active on all screens and causes an immediate shutdown of the motor. Use of the manual S top
button will also take the compressor off-line.
Automatic Stop
When the AUTO START/STOP feature is enabled and the compressor is in the Automatic mode, the
compressor will stop automatically when the control parameter falls below the cut-out setpoint.
Remote/Auto Remote Stop
I/O Control
When remote operation is desired using discrete I/O signals, the Remote Start/Stop input signal is used to stop the
compressor for the Auto-Remote mode. When the Remote Start/S top input is de-energized, the compressor will
stop but remain on-line. A failure or manual stop command will stop the compressor and force it of f-line.
Network Control
When the NETWORK COMMUNICA TIONS option is enabled, stopping in the Remote and Auto-Remote modes is
performed using messages from a remote computer. Separate messages are available to stop the compressor and
leave it on-line, or to stop the compressor and force it off-line. For more information on network operation, please
refer to Appendix C.
Sequenced Stop
When the STOP command is received from the master sequencer, the V iltech will stop the RECIP
compressor automatically and leave it on-line for sequenced operation. While stopped on-line, the
compressor is available for sequencing and in standby waiting for commands.
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Capacity Control
CAPACITY CONTROL on a RECIP compressor is performed by adding or removing stages. Loading the
compressor adds stages which increases the compressor capacity and Unloading the compressor
removes stages which decreases the compressor capacity. A stage can consist of one or more Loaders
which energize to add pistons, or Unloaders which de-energize to remove pistons. Capacity Control can
be performed manually or automatically depending on the mode of operation.
CAPACITY SETPOINTS there is a Max Time at 0% capacity which is a timer that is intended to NOT
allow the compressor to run too long at 0% capacity. The timer is activated in automatic and remote
modes. If the compressor runs at 0% capacity longer than the allowed time then the compressor will
perform a “Normal” stop and a log entry will be documented. When Auto Start/Stop is enabled then the
compressor will restart when the suction pressure rises above the cut-in setpoint. The compressor may
restart immediately, when two cases occur. Case #1- When the capacity ramp start delay is programmed
lengthy and a low max time is at 0% capacity, it is possible that the Max 0% capacity timer will expire
before the capacity ramp allows the machine to load. If, the suction pressure is above the cut-in setpoint
and auto start/stop is enabled, compressor will restart immediately. Case #2- When the suction pressure
is above cut-in and discharge pressure is above the limit/unload may be holding the compressor at 0%
capacity so the 0% capacity timer will expire and the compressor will restart immediately .
Manual Capacity Control
In MANUAL mode, the capacity is adjusted using the keypad on the Viltech. The up-arrow is used
to add stages and the down-arrow is used to remove stages. Each time an arrow key is hit, one
stage is added or removed until the compressor is fully loaded or unloaded. Manual capacity
control can only be performed when viewing the Main Status screen.
Automatic Capacity Control
AUTOMATIC CAPACITY CONTROL is accomplished by adding or removing stages to load and
unload the compressor in response to changes in the control parameter (suction pressure or process
temperature). Capacity changes are achieved using a time proportional control strategy with
setpoints for Control Deadband, Normal Bandwidth, Normal Stage Delay , and Fast Stage Delay.
Separate setpoints are provided for loading and unloading the compressor so that the operator may
tune the system differently for increasing or decreasing load conditions.
The operator can also define up to four Control Groups which consist of Cut-In, Cut-Out, Control,
Low Alarm, and Low Failure setpoints. The active control group can either be selected manually by
using the active group screen or automatically through setpoint scheduling. The operator can also
define a minimum capacity value which is used to limit capacity changes at the lower limit.
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Control Groups
Four groups of control setpoints can be defined for use with automatic capacity control. Each setpoint group
consist of a Cut-In, Cut-Out, Control, Low Alarm, and Low Failure setpoint.
Cut-Out Setpoint -The V iltech will stop the compressor when the suction pressure or process temperature goes
below the cut-out setpoint.
Cut-In Setpoint - The Viltech will start the compressor when the suction pressure or process temperature goes
above the cut-in setpoint.
Control Setpoint -The V iltech will change the capacity in an attempt to maintain the suction pressure or process
temperature at the control setpoint.
Low Alarm/Failure Setpoints -These are the low suction pressure or process temperature alarm and failure
values associated with the control setpoint. In Sequenced Mode, the local setpoints are replaced by the Sequencer
low alarm and failure set-points transmitted by the master sequencer controller.
Time Proportional Contr ol Strategy
For automatic capacity control, the amount of time between stage changes is a function of how far the Control
Parameter is from the Control Setpoint and how long the Control Parameter remains outside the Control Deadband.
A separate set of control parameters is defined for increasing or decreasing load conditions.
Control Deadband - When the difference between the Control Setpoint and the Control Parameter is less than the
deadband value capacity changes will take place. If the Control Deadband values are too small, the capacity may
increase and decrease excessively causing fluctuations in the Control Parameter. If the Control Deadband are too
large, the compressor may not hold the Control Parameter close enough to the Control Setpoint resulting in
inefficient capacity control.
Normal Bandwidth - If the difference between the Control Setpoint and the Control Parameter is between the
Control Deadband value and the Normal Bandwidth value, the Normal Stage Delay timer will be used to determine
when a stage will be added or removed.
If the difference between the Control Setpoint and the Control Parameter is greater than the Normal Bandwidth
value, the Fast Stage Delay timer will be used to determine when a stage will be added or removed. This ensures
that capacity changes will occur more quickly when the Control Parameter is far from the Control Setpoint.
If the Normal Bandwidth values are too small, the compressor will respond too quickly to small load changes and
may constantly overshoot the optimal position. If the Normal Bandwidth values are too large, the compressor will
react too slowly to load changes.
Normal Stage Delay - This is the amount of time used between stage changes when the Control Parameter is
between the Control Deadband and the Normal Bandwidth. This value should be greater than the Fast Stage Delay
time. If the Normal Stage Delay time is too small, then capacity changes will occur too often, possibly not allowing
the affects of the previous change to take effect.
Fast Stage Delay - This is the amount of time used between stage changes when the Control Parameter is outside
the Normal Bandwidth. This value should be less than the Normal Stage Delay time. If the Fast Stage Delay time is
too large, then capacity changes will not occur often enough, possibly allowing the system to exceed safe limits.
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The relationship of these parameters can be seen in the time proportional control strategy diagrams shown below:
Difference Above Setpoint
Stages added using the fast delay timer
Load Bandwidth
Stages added using the normal delay timer
Load Deadband
No stages added or removed
No stages added or removed
Unload Deadband
Unload Bandwidth
Stages added using the fast delay timer
Difference Below Setpoint
Control Setpoint
Stage Control Safety
Remote Capacity Control
When the Network Communications option is enabled, and the compressor is in the Remote mode, capacity
control is performed using load and unload messages from a remote computer. For more information on network
operation, please refer to Appendix C.
Auto-Remote Capacity Control
When the Network Communications option is enabled, and the compressor is in the Auto-Remote mode, capacity
control is performed using AUTOMATIC CAPACITY CONTROL. The control setpoint is selected using setpoint
messages from a remote computer.
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Sequenced Capacity Control
While in the SEQUENCED mode, Automatic Capacity Control is used to adjust the capacity as documented
above. This is also true for Sequenced mode in Remote control. The master panel will wait for a remote indication
to start and according to the parameter setpoints in the sequencer setpoints screen then the master will turn on
and off the slave panels. If the master panel receives a remote indication to stop then the master panel will
sequentially communicate to the other panels to unload and all the panels will stay on-line
When a sequenced compressor is on-line, one of the following three commands will be sent from the master
sequencer controller.
• Trim When the trim command is sent from the master sequencer, the V iltech will start the RECIP
compressor. The Control Parameter and Control Setpoint will be also be sent from the master , and the
compressor will begin making capacity adjustments using Automatic Capacity Control. Once the
compressor is started, the status area will display RUN-TRIM indicating that the trim command was
received.
• Full Load When the Full Load command is sent from the Master Sequencer , the Viltech will force and
hold the compression at full capacity. When the Full Load command has been received the status area
will display FULL LOAD.
• Seq-Stop When the Seq Stop command is received from the master sequencer the V iltech will stop the
RECIP compressor automatically and leave it on-line for sequenced operation.
.
Low Alarm and Failure Setpoints
When Sequenced mode is enabled and the compressor is online or running, the local low alarm and failure
setpoints are replaced by the Sequencer low alarm and failure setpoints. This is true for both Suction
Pressure and Process Temperature operation. The local sensor is still used to generate the alarm or failure
condition.
Running in Trim Mode
When the TRIM command is sent from the master sequencer the V iltech receives the System Control
Parameter, System Control Setpoint, and the sequencer load and unload deadband and bandwidth
parameters. These new control parameters are used instead of those defined on the Viltech itself. The
compressor’s local Normal Stage delay and Fast Stage delay are used for capacity changes.
The main status page will identify the control setpoint group as SY indicating that it is the System Control
Setpoint. Automatic Capacity Control is used to adjust the capacity while in Sequenced mode. The
System Control Parameter, System Control set-points, and Low Alarm and Failure setpoints are sent to the
compressor periodically by the master sequencer to ensure that the compressor is always using current
data. All automatic starting and stopping of the RECIP compressor is controlled by the master sequencer.
The local RECIP’s Cut-In and Cut-Out controls are also disabled. When the RECIP compressor is fully
loaded, limited, or forced to unload due to high process temp or suction pressure, the VILT ech informs the
master sequencer that no further capacity increases are possible and additional compressors may be
needed.
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Running in Full Load Mode
When the FULL LOAD command is received the Viltech disables all capacity control and locks the
compressor at the fully loaded position. However, normal limiting and unloading functions will still be active.
Anti-Cycle in Sequenced Mode
While in the SEQUENCED mode the anti-cycle time takes on a new role. If the master sequencer requests a
RECIP compressor to stop but time is still remaining on the anti-cycle timer , the compressor will not stop. The
compressor will remain running, until the anti-cycle timer expires. This procedure ensures that the compressor
is always available for the next sequenced start. If the compressor should be stopped manually, or due to a
failure, with time remaining on the anti-cycle timer it would then be unavailable for sequencing until the timer
expires.
Forced Unloading & Limiting
FORCED UNLOADING AND LIMITING are performed to protect the system under extreme conditions or to slow-
down the rate of capacity increase. The V iltech may unload the compressor or limit loading of the compressor due
to high discharge and suction pressure. In the Manual mode of operation and forced unloading is enabled.
Forced Unloading and Limiting will cancel any ongoing capacity control changes. If a parameter exceeds the high
limit setpoint the compressor will be limited (not allowed to load). If a parameter exceeds the high unload setpoint
the compressor will be forced to unload until the parameter is reduced.
Ramp Start
RAMP START adjusts the forced unloading and limiting setpoints during a period of time after the compressor is
started. Ramp start is used to reduce the demand power requirements during compressor startup. Each high
unload and high limit setpoint has associated with it a similar ramp unload and ramp limit setpoint. Also associated
with each different parameter is a ramp duration time. After the compressor has started, the forced unloading and
limiting setpoints are gradually changed from the ramp setpoints to the high setpoints during the ramp duration
time. The Discharge Pressure Ramp Start parameters are set-up on the Discharge Pressure Setpoints screen under
the SETPT hot key .
The relationship of the ramp start feature to unloading and limiting can be seen in the following figure.
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Capacity Ramp Start Limiting
The CAPACITY RAMP START feature has been provided to limit capacity increases after the
compressor starts. The operator can define the total time to limit capacity increases from the minimum
capacity to 100% capacity. Once the compressor has started and the minimum capacity has been
achieved, the capacity ramp timer is started, and further capacity increases will be limited. The
maximum allowable capacity will be gradually increased from the minimum capacity to 100% over the
ramp duration. When the capacity is limited due to this feature, the RECIP state will display
“LIMIT:CAP”. Unlike other limiting and unloading, the compressor is not considered fully loaded
when in this state.
The Capacity Ramp Start feature is available in Automatic, Auto-Remote and Sequenced mode.
When in Sequenced mode, capacity changes are limited when the compressor is a Fully Loaded
machine. If a fully loaded compressor is forced to unload for any reason, the capacity ramp will
engage from the current capacity position once the limiting condition has gone away. The Capacity
Ramp Start parameters are set-up on the Capacity set-point screen.
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Staging Setup
The Viltech controller can be configured to operate on any compressor that performs capacity control in discrete
steps. The Controller supports up to six (6) capacity steps. Each capacity step is configured to energize to unload
(Unloader). Also, each capacity step can be assigned a percentage associated with that level of capacity. A
capacity percentage is also assigned to the fully unloaded position. The staging configuration is accessed from
the configuration menu (MENU >SYSTEM SETUP -> CONFIGURE HARDWARE -> STAGING
CONFIGURATION). To avoid possible damage to the compressor , it is important that the capacity configuration
be setup to match the compressor configuration when the controller is initially installed.
Minimum Capacity
Certain compressors should not operate below a minimum capacity value under normal operations. The compressor starts fully unloaded and then must be staged up to the minimum immediately. Once the compressor has
started and the “Up to Speed” delay has expired, the compressor will be staged up to the minimum capacity
position using the load fast stage delay. Once the minimum capacity has been reached, the compressor will
transition into the running state. Under normal capacity control, the compressor will never unload beyond this
value. Please check the compressor manufactures documentation to verify if this is required for your unit.
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Setpoint Scheduling
SETPOINT SCHEDULING is the automatic switching of Suction Pressure or Process Temperature control
setpoint groups based on time of the day and day of the week. The operator can define up to seven (7)
different daily time schedules and one weekly schedule. Schedule events can be manually overridden
and scheduling can be enabled or disabled by the operator. Setup of schedules and control of the
scheduling is performed from the Scheduling menu under the SETPT hot key .
Daily Schedules
Each DAILY SCHEDULE consists of up to eight (8) different time-of-day slots. For each time-of-day
slot the operator can define the time (either in 12 or 24 hour mode, depending on system clock mode
selected) and the desired setpoint group number. Unused time slots are ignored and the schedule
may be entered in any order. When the schedule is saved it is reordered chronologically. Each daily
schedule is identified by a schedule name (SCH1 - SCH7).
Weekly Schedule
The WEEKLY SCHEDULE allows the operator to assign different daily schedules to each day of the
week. A new day begins and schedules change at midnight. The current daily schedule or control
group may be overridden by the operator at anytime. Any item which has been manually overridden
will be changed when the next schedule change occurs.
Oil Pressure Computation
The oil pressure for a RECIP compressor is computed as follows:
Oil Pressure = Oil Pressure Sensor - Suction Pressure
The actual sensor value can be viewed on the Calibration and View analog screens. All other screens
display the computed value.
Oil Temperature Regulation
The OIL TEMPERATURE in the crankcase is regulated when the RECIP compressor is stopped. The temperature is
maintained above the oil heater setpoint with a deadband of +5 degrees. When the compressor is stopped, and
the Oil T emperature falls below the Heater Control Setpoint, the Oil Heaters will be turned on. When the Oil
T emperature rises 5 degrees above the Heater Control setpoint, the oil heaters will be turned of f. The Heater
Control Set-point may be found on the Oil T emperature Setpoints screen under the SETPT hot key.
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Anti-Cycle Timer
The ANTI-CYCLE TIMER is used to avoid repeated start attempts within a user programmable period of
time. The Anti-Cycle timer is started with the motor and must completely count down before the motor
can be started again. The duration of the Anti-Cycle timer can be adjusted from the Miscellaneous
Controls.
Power Fail Restart
The operator can define a POWER FAIL RESTART time from the miscellaneous controls screen. If the
Viltech is reset manually or due to a loss of power the down time is calculated and compared to this
setpoint. If power was off longer than the power fail restart time a failure is reported. If the power loss
was less than the setpoint no failure is reported and the compressor remains on-line and is allowed to
automatically restart if required.
Process Temperature Control (Option)
When the PROCESS TEMPERATURE option is enabled, the RECIP compressor capacity is adjusted to
maintain the outlet temperature of a product or process instead of suction pressure
(e.g. chiller outlet temperature control). The control strategy is documented in the Capacity Control
section above.
Two Stage Configuration (Option)
In a TWO STAGE CONFIGURATION, an intermediate pressure and temperature sensor are monitored. High Failure,
High Alarm, Low Alarm and Low Failure setpoints are provided for each.
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Operational Procedures
The operator interface for the RECIP compressor is performed using LCD, keypad, and the
following four hot keys:
STOP
SETPT
LOGS
MENU
The following sections will explain the operating procedures associated with each of these
hot keys.
Momentary Screen
The following table lists possible momentary screens associated with the ST ART mode key function.
SCREEN FUNCTION
ST ARTING MANUAL MODE The compressor is starting in the Manual mode.
STARTING AUTOMA TIC MODE The compressor is starting in the Automatic mode.
ON-LINE REMOTE MODE The compressor is on-line in the Remote mode and may be started by the
remote computer.
ON-LINE AUTO-REMOTE MODE The compressor is on-line in the Auto-Remote mode and may start,
depending on the state of the Remote Start/Stop input, or the remote
computer.
ON-LINE SEQUENCED MODE The compressor is on-line in the Sequenced mode and may start,
depending on the master sequencer.
ST ART DISABLED ALREADY The start function is disabled because the compressor is already in the
IN PROGRESS process of undergoing the start-up operation.
ST ART DISABLED SYSTEM The start function is disabled because the compressor is already IS
RUNNING running.
ST ART DISABLED ANTI-CYCLE The compressor is delayed from starting. An anti-cycle timer has been
XX:XX activated which prevents start-up until the time period has expired
(XX:XX is the time remaining). The screen will continue to be displayed
until the timer expires or the user presses the QUIT key .
ST ART DISABLED SYSTEM The start function is disabled due to a system alarm or ALARM/ failure.
ALARM/F AILURE
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Status Screens
The status of the compressor can be viewed from a group of status screens as described below. Consecutive uses
of the QUIT key will return the user to the main
Compressor Main S tatus Screen
The COMPRESSOR STATUS SCREEN shows a numerical summary of the compressor analog and state
parameters. The values are continuously updated in real-time to reflect the current state of the compressor.
For example, in the figure below, the current state of the system is ST OP-ONLINE. The system’ s mode of
operation is SEQ (Sequenced) and the alarm status of the system is NORM (normal). There are also two
system functions which may be performed from this screen: Capacity adjustment when in Manual mode and
the clearing of alarms and failures.
STATUS SCREEN.
RECIP Status Screens
The following table lists the additional keys available on the RECIP status screen.
K E Y FUNCTION
UP ARROW Loads the compressor when RECIP is in Manual or Local mode. One stage is added each time
the UP arrow key is pressed.
DOWN ARROW Unloads the compressor when RECIP is in Manual or Local mode, or if one stage is removed.
CLEAR Stops manual capacity loading or unloading. Acknowledges alarms and failures and stops the
alarm horn from sounding.
RECIP Status Screen Keys
Manual Capacity changes are discussed in the Capacity Control section and Alarms and Failures are discussed in
the Alarm/Failure section of this manual.
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The following table lists the various parameters displayed on the RECIP status screen.
PARAMETER DESCRIPTION
S1-S4, P1-P4, SY The active capacity control setpoint. S1-S4 indicate represent Suction
Pressure setpoints, P1-P4 represent Process Temperature setpoints, and SY
represents the Sequenced setpoint.
SP Suction Pressure
DP Discharge Pressure
OP Oil Pressure
IP Intermediate Pressure (two-stage machines only)
CP Capacity
ST Suction Temperature
DT Discharge T emperature
OT Oil Temperature
Status Banner
The STATUS BANNER is located at the bottom of the Compressor status screen, Active
Alarms & Failures screen, and Auto-Start Warning status screen. The Banner consists of
three highlighted sections which provide the user with the status of the following system
conditions.
Current System State
Current Operating mode
Alarm & Failure Status
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Current System S tate
The left-most highlighted status banner section displays the CURRENT STATE of the system. The following is a
table with a brief description of possible system states.
CURRENT ST A TE DESCRIPTION
ACYCLE XX:XX Anti-cycle count down timer has been activated to delay motor start. XX:XX is the time remaining.
STOPPED Compressor is stopped.
STARTING Starting sequence is in progress.
RUNNING Compressor is running.
INCREASING Capacity is increasing.
DECREASING Capacity is decreasing.
LIMIT :CAP Loading was stopped due to capacity
LIMIT:DP Loading was stopped due to high discharge pressure.
UNLOAD:DP Forced unloading due to high discharge pressure.
STOPPING Stopping sequence is in progress.
FAILED Compressor has failed.
RESET The Viltech has been reset.
STOP-OFFLINE Compressor is stopped and is off-line (not available for auto start).
STOP-ONLINE Compressor is stopped and is on-line (available for auto start)
STOP CUT-OUT Compressor is stopped on cut-out pressure (or temperature)
RUN-TRIM The compressor is running in Sequenced mode as the Trim machine.
FULL-LOAD The compressor is running in Sequenced mode as a Fully Loaded machine.
System State
Mode Area
The middle highlighted status banner section displays the general operating mode of the system as shown in the
following table:
MODE DESCRIPTION
AUTO Automatic mode is selected.
MAN Manual mode is selected.
RMT Remote mode is selected.
SEQ Sequenced mode is selected.
System Modes
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Alarm & Failure Area
The right most highlighted status banner section displays the ALARM AND FAILURE
STATUS of the system. When a new alarm or failure occurs, this area will flash from
highlighted to non-highlighted to inform the operator. The area will stop flashing but
remain highlighted when the operator has used the CLEAR key to acknowledge the alarm or
failure. Once all alarm and failure conditions have be corrected the operator may again
press the CLEAR key to clear the alarm from the display. The following table lists the
various alarm/failure states and their meanings.
NOTE: If both an alarm and failure exist the failure state will be displayed as it has a
higher priority
ALARM SYSTEMS STATUS
MESSAGE
NORM No alarm or failure is active, the RECIP is operating normally.
ALARM An alarm is active on the RECIP.
FAIL A failure is active on the RECIP.
Operating Hours Screen
Alarm Status
The OPERATING HOURS STATUS screen allows the operator to view the compressor’s
current running hours since its last start and the total number of hours the system has been
in operation since installation In addition, the number of compressor starts is accumulated
for today, yesterday, and the overall total.
Operating Hours Status Screen
The following table lists the various parameters displayed on the screen.
TERM DEFINITION
RUNNING HOURS The number of successive motor running hours since the last start up.
TOT AL HRS The motor’s total accumulated running hours.
STARTS TODAY The number of times the motor has been started since midnight.
STARTS The number of times the motor was started yesterday.
YESTERDA Y
STAR TS TOTAL The total number of times the motor has been started.
Operating Hours Status Definitions
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Active Alarms & Failur es Status Scr een
The ACTIVE ALARMS & FAILURES STATUS screen displays the system’s current Alarms/Failures. This screen
will be the initial screen displayed by the system when an alarm or failure first becomes active. The default status
screen can be reached by simply pressing the QUIT key. An example of the alarm screen is shown below .
Active Alarms & Failur es Status Scr een
The active function keys for this screen are described in the following table.
KEY FUNCTION
SHIFT UP/ Switches control between the display area and the hot keys. Scrolls line by line through the information.
DOWN ARROWS
CLEAR The CLEAR key is used to acknowledge and clear alarms/failures as well as to silence the alarm horn.
Active Alarms & Failur es Status Scr een Definitions
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Auto-Start W arning Screen
The AUTO-START WARNING screen is displayed anytime the RECIP may be automatically
started. The user can return to the system default status screen by pressing the QUIT key
or cycle through all the status screens using the ENTER key . The system will return to the
Auto-Start Warning screen after 10 minutes of keypad inactivity. An example of the screen
is shown below.
AUTO S tart Warning Scr een
SETPT Hot Key
The SETPT hot key allows the operator to select various systems options available. When the
SETPT key is selected, a menu screen displays the available options contained on the system.
SETPT Hot Key Screen
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Setpoint
The SETPOINT option allows the user to access a set of menu options used to set the
systems various setpoints. SETPOINTS
1. PRESSURE
1. SUCTION CONTROL GROUP
2. HIGH SUCTION
3. DISCHARGE
4. OIL
5. INTERMEDIA TE (T wo stage only)
2. TEMPERA TURE
1. DISCHARGE
2. OIL
3. PROCESS GRP
4. HIGH PROCESS
5. INTERMEDIA TE (T wo stage only)
3. CAP ACITY
SETPT Menu Diagram
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Pressure Setpoints
The Pressure Setpoints menu allows the user adjust the various pressure related setpoints
described in the following sections.
Suction Pressure Control Groups
This screen allows the user to set the control values for each of the RECIP’s four (4) control groups
which are used for Automatic Capacity control. An example of the screen is shown below.
Suction Pressure Control Data Entry Screen
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The following table lists the data entry fields on the screen and a description of their purposes.
TERM DEFINITION RANGE
CUT -IN Cut-in Setpoint. If Automatic or Auto-Remote mode is
selected, Auto Start/Stop is enabled, the compressor is
on-line, and the suction pressure rises above the Cut-in
Setpoint, the compressor will start. 29.9 INHG 185.0 PSIG
CONTROL Control Setpoint. In the Automatic or Auto-Remote
mode of operation the compressor is loaded or unloaded
as required to maintain the Control Set-point. 29.9 INHG 185.0 PSIG
CUT -OUT Cut-out Setpoint. If Automatic or Auto-Remote mode
is selected, Auto Start/Stop is enabled, the compressor is
running, and the suction pressure falls below the Cut-out
Setpoint, the compressor will stop. 29.9 INHG 185.0 PSIG
LOW ALARM The Suction Pressure value at which the Viltech should
report a Low Suction Pressure alarm to the operator
(for all modes except Sequenced). 29.9 INHG 185.0 PSIG
LOW F AILURE The Suction Pressure value at which the Viltech should
fail (stop) the compressor and report a failure to the
operator (for all modes except Sequenced). 29.9 INHG 185.0 PSIG
Suction Pressure Control Data Definitions
Suction Pressure Active Group Control Screen
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TERM DEFINITION RANGE
ACTIVE GROUP There are four possible suction pressure control
groups, each with its own pressure parameters.
This field is used to manually select the active
setpoint group. S1 -S4
Suction Pressure Active Group Control Definitions
High Suction Pressure Setpoints
The HIGH SUCTION PRESSURE alarm and failure setpoints are not scheduled and are active
regardless of which group is in control.This screen also has the High Suction Limit & Unloading
for each step of CapacityControl
High Suction Pressure Setpoints Screen
The following table lists the data entry fields for the High Suction Pressure Set-points screen
TERM DEFINITION RANGE
HIGH F AILURE The compressor is failed (stopped) when this 29.9 INHG
value is exceeded. -185 PSIG
HIGH ALARM The Viltech reports an alarm to the operator when 29.9 INHG
this value is exceeded. -185 PSIG
High Suction Pressure Data Definitions
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Discharge Pressure Setpoints
The DISCHARGE PRESSURE SETPOINTS screen is used to set the discharge pressure control parameters for
high alarm, limiting, and ramp conditions.
Discharge Pressure Setpoints Data Entry Screen
The following table lists the data entry fields for the Discharge Pressure Setpoints screen.
TERM DEFINITION RANGE
HIGH FAILURE The compressor is failed (stopped) when this value is exceeded. 0 - 225 NH3 0
- 275 FREON
HIGH ALARM The Viltech reports an alarm to the operator when this value is exceeded. 0 - 225 NH3 0
- 275 FREON
HIGH UNLOAD The compressor is forced to unload when this value is exceeded. 0 - 225 NH3 0
- 275 FREON
HIGH LIMITING The compressor is not allowed to load when this value is exceeded. 0 - 225 NH3 0
- 275 FREON
RAMP UNLOAD The starting value of the forced unload parameter used during ramp start. 0 - 225 NH3 0
- 275 FREON
RAMP LIMITING The starting value of the limiting parameter used during ramp start. 0 - 225 NH3 0
- 275 FREON
RAMP ST ART DELA Y The time period after start used to ramp the forced unload and limiting
parameters from the ramp value to the normal value. 0.1 - 60 Min
RAMP ST AR T Allows Discharge Pressure Ramp start to be enabled or disabled. ENABLE/
ENABLE DISABLE
Discharge Pressure Data Definitions
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Oil Pressure Setpoints
The OIL PRESSURE SETPOINTS screen allows the operator to set acceptable ranges for the oil pressure
parameter to allow the V iltech to identify when the value is out of range. An example of the screen is shown
below .
Oil Pressure Setpoints Screen
The following table lists the data entry fields and a description of their purpose.
TERM DEFINITION RANGE
LOW ALARM The Viltech will report an alarm to the operator when
the Oil Pressure is below this value 20 - 200 PSIG
LOW F AILURE The compressor will be failed (stopped) when the
Oil Pressure is below this value. 20 - 200 PSIG
NOTE: The Oil Pressure on a RECIP Compressor is computed as the differential between the Oil Pressure Sensor and
Suction Pressure.
Oil Pressure Setpoints Definitions
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Intermediate Pressure Setpoints (T wo S tage only) Option
The INTERMEDIATE PRESSURE SETPOINTS screen allows the operator to set acceptable ranges for the
intermediate pressure, and is only visible on the two stage compressor. An example of the screen is shown below.
Intermediate Pressure Setpoints
The following table lists the data entry fields and a description of their purposes.
TERM DEFINITION RANGE
HIGH FAILURE The compressor is failed (stopped) when the Intermediate
Pressure exceeds this value. 0 - 225 PSIG
HIGH ALARM The Viltech reports an alarm to the operator when the
Intermediate Pressure exceeds this value. 0 - 225 PSIG
LOW ALARM The Viltech will report an alarm to the operator when the
Intermediate Pressure is below this value. 0 - 225 PSIG
LOW F AILURE The compressor will be failed (stopped) when the
Intermediate Pressure is below this value. 0 - 225 PSIG
Intermediate Pressure Definitions
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Temperature Setpoints
The TEMPERA TURE SETPOINTS menu allows the user to set temperature related setpoints
described in the following sections.Discharge Temperature Setpoints
Discharge T emperature Setpoints
The DISCHARGE TEMPERATURE SETPOINTS screen allows the operator to set acceptable
ranges for the RECIP discharge temperature
16 single stage compressors.
.
and second discharge temperature (DT2) for 12 &
Discharge Temperature Setpoints Screen
The following table lists the data entry fields and a description of their purposes.
TERM DEFINITION RANGE
HIGH FAILURE The compressor is failed (stopped) when
the discharge temperature exceeds this value. 32 - 392 DEGF
Discharge Temperature Definitions
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Oil T emperature Setpoints
The OIL TEMPERATURE SETPOINTS screen allows the operator to set acceptable ranges for the
RECIP oil temperature.
Oil Temperature Setpoints Screen
The following table lists the data entry fields and a description of their purposes.
TERM DEFINITION RANGE
HIGH F AILURE The compressor will be failed (stopped) when
the oil temperature exceeds this value. 3 2 - 392 DEGF
HIGH ALARM The V iltech will report an alarm to the operator
when the oil temperature exceeds this value 32 - 392 DEGF
HEA TER CONTROL The temperature at which to maintain the oil in
the separator. The oil heater uses the Oil
Temperature sensor but only when the compressor
is stopped. 32 - 392 DEGF
LOW ALARM The V iltech will report an alarm to the operator when
the Oil T emperature is below this value. 32 - 392 DEGF
LOW F AILURE The compressor will be failed (stopped) when the
Oil T emperature is below this value. 32 - 392 DEGF
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Oil Temperature Definitions
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Process T emperature Control Group
The PROCESS TEMPERATURE CONTROL GROUP screen is used to set-up the Process Temperature control
parameters when the Process Temperature Control option is enabled.
Process Temperature Control Group
TERM DEFINITION RANGE
CUT -IN Cut-in Setpoint. If Automatic or Auto-Remote mode is selected,
Auto Start/Stop is enabled, the compressor is on-line, and the process
temperature rises above the Cut-in Setpoint, the compressor will start. -58: 122 DEGF
CONTROL Control Setpoint. In the Automatic or Auto-Remote mode of operation
the compressor is loaded or unloaded as required to maintain the Control
Set-point. -58: 122 DEGF
CUT -OUT Cut-out Setpoint. If Automatic or Auto-Remote mode is selected, Auto
Start/Stop is enabled, the compressor is running, and the process temperature
falls below the Cut-out Setpoint, the compressor will stop. -58: 122 DEGF
LOW ALARM An alarm is reported when the Process T emperature falls below the low
alarm setpoint. -58: 122 DEGF
LOW F AILURE A failure is reported and the compressor is shutdown when the Process\
T emperature falls below the low failure setpoint. -58: 122 DEGF
Process Temperature Definitions
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Process Temperature Active Group Control Screen
TERM DEFINITION
ACTIVE GROUP There are four possible process temperature control groups, each with it’ s own
temperature control parameters. This field is used to manually select the active
setpoints group.
Process Temperature Active Group Control Definitions
High Process T emperatur e Setpoints
The HIGH PROCESS TEMPERA TURE SETPOINTS screen is only visible when the Process T emperature
Control option is enabled.
High Process Temperature Setpoints Screen
TERM DEFINITION RANGE
HIGH F AILURE A failure is reported and the compressor is shutdown when
the Process Temperature rises above the High Failure setpoint -58: 122 DEGF
HIGH ALARM An alarm is reported when the Process T emperature rises
above the High Alarm setpoint. -58: 122 DEGF
High Process Temperature Setpoint Definitions
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Note Page
Intermediate T emperatur e Setpoints (T wo Stage only)
The INTERMEDIATE TEMPERATURE SETPOINTS screen is only visible on a Two Stage compressor .
Intermediate Temperature Setpoints
The following table lists the parameters displayed on the Process Temperature Setpoints screen.
TERM DEFINITION RANGE
HIGH F AILURE A failure is reported and the compressor is shutdown when the Intermediate
T emperature rises above the High Failure setpoint 32 - 392 DEGF
HIGH ALARM An alarm is reported when the Intermediate Temperature rises above the
High Alarm setpoint. 32 - 392 DEGF
LOW ALARM An alarm is reported when the Intermediate T emperature falls below the low
alarm setpoint. 32 - 392 DEGF
LOW F AILURE An failure is reported and the compressor is shutdown when the Intermediate
T emperature falls below the low failure setpoint. 32 - 392 DEGF
Intermediate Temperature Active Definitions
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Capacity Setpoints
The CAPACITY SETPOINTS screen allows the operator to set acceptable ranges for minimum Capacity
and Ramp Start Parameters as shown in the following example.
Capacity Setpoint Screen
Capacity Setpoint Screen
The following table lists the data entry fields and a description of their purposes.
TERM DEFINITION RANGE
MINIMUM CAP ACITY The minimum allowable capacity of the compressor when
running. 0 - 100 PCT
RAMP ST ART DELAY The amount of time after startup that Capacity Limiting will
take place. 0-6 0 M IN
RAMP ST ART ENABLE Allows Capacity Ramp Start to be enabled or disabled. ENABLE/
DISABLE
Capacity Setpoint Definitions
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Scheduling
The SCHEDULING function allows the user to create and modify schedules to control the changing of Suction
Pressure or Process Temperature Setpoints based on the day of the week and time of day. The following sections
will describe the various screens associated with this function.
Scheduling
1. CONTROL
2. ACTIVE GROUP
3. ACTIVE SCHED
4. WEEKL Y SCHED
5. DAIL Y SCHED
Control
The CONTROL screen allows the user to determine if equipment operation will be controlled by predefined schedules.
An example of this screen is shown below.
The following table lists the data entry fields and a description of their purposes.
TERMS DEFINITION RANGE
SCHEDULING Allows the Setpoint Scheduling feature to be enabled or disabled ENABLED/DISABLE
Scheduling Control Screen
Scheduling Definition
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Active Group
The ACTIVE GROUP screen allows the user to select the current active group. This setting will be active
until a scheduling change or the operator modifies it. An example of the screen is shown below.
Active Group Screen
The following table lists the data entry fields and a description of their purposes.
TERM DEFINITION RANGE
GROUP NUMBER The active suction pressure control group for the system.
If Suction Pressure control is enabled, G1G4 correspond to
Suction Pressure control groups S1-S4. If Process
T emperature control is enabled, G1-G4 correspond to Process
T emperature control groups P1-P4. G1-G4
Active Group Definitions
Active Schedule
The ACTIVE SCHEDULE screen allows the user to change the current active daily schedule. This setting
will be active until a scheduling change or the user modifies it. An example of the screen is shown below.
Active Schedule Screen
The following table lists the data entry fields and a description of their purposes.
TERM DEFINITION RANGE
DAIL Y SCHEDULE The current daily schedule used by the system. SCH1 - SCH7
Active Schedule Definitions
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Weekly Schedule
The WEEKLY SCHEDULE screen is used to define which of the seven available daily schedules is to be
assigned to each day of the week as shown in the following example screen.
Weekly Schedule Screen
The following table lists the data entry fields and a description of their purposes.
TERM DEFINITION RANGE
DA YS OF THE WEEK The daily schedule assigned to that specific day of the week. SCH1 - SCH7
Weekly Schedule Definitions
Daily Schedule
The DAILY SCHEDULE function is used to define the times at which to change control setpoints for
each of the seven available daily schedules. The first screen upon entering the Daily Schedule
function is an access screen, which prompts the user to enter a number from one to seven to view the
corresponding Daily Schedule.
Daily Schedule Screen
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Schedule 1 To Schedule 7
The seven DAILY SCHEDULES all have a standard format allowing the user to select up to 8 schedule changes
per day . The following example shows the standard format for all seven of the daily schedules.
DAIL Y SCHEDULE hh:mm:ss
NUMBER SCHED TIME GROUP
1 XX:XX AM G1
2 XX:XX AM G2
3 XX:XX AM G3
4 XX:XX AM G4
5 XX:XX AM G3
6 XX:XX AM G2
7 XX:XX AM G1
8 XX:XX AM G1
Daily Schedule 1 Screen
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The following table lists the data entry fields and a description of their purposes.
TERM DEFINITION RANGE
SCHED TIME The time of day the control group will be changed to the selected group. Valid Time
GROUPS The control group number to be used after the scheduled time occurs. G1-G4
Daily Schedule 1 Definitions
CAP Control
The CAP CONTROL option allows the user to access a set of menu options used to
set the systems control features. CAP CONTROL
CAP CONTROL
1. SUCT PRESS
2. PROC TEMP
Suction Pressure Control Setpoints
The SUCTION PRESSURE CONTROL SETPOINTS screen allows the user to set-up the Load and Unload Controls
for Automatic capacity control. The Normal Stage delay and Fast S tage Delay fields are also used for Capacity
changes in the Sequenced mode. Included on this screen is additional reference data to assist the operator when
setting-up the compressor. An example of the screen is shown below .
SUCTION PRESS CONTROL SETPTS hh:mm:ss
LOAD UNLOAD
NORMAL BANDWIDTH XX.X XX.X PSID
CONTROL DEADBAND XX.X XX.X PSID
NORMAL ST AGE DELA Y XX.X XX.X SEC
F AST ST AGE DELA Y XX.X XX.X SEC
SETPOINT S 1 X.X PSIG SP XX.X INHG
MODE AUTO C P XX.X PCT
STA TE FAILED
Suction Pressure Control Setpoints Screen
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The following table lists the data entry and information fields on the screen and a description of their purposes.
P ARAMETER DEFINITION RANGE
NORMAL Adjusts the sensitivity of the time proportional control routine. 0 - 20 PSID
BANDWIDTH
CONTROL The capacity will not be adjusted if the suction pressure is within
DEADBAND the control deadband. 0- 20 PSID
NORMAL The Normal Stage Delay Timer starts when the Suction Pressure
ST AGE DELAY exceeds the Control Deadband. When it expires, a stage will be added
or removed as appropriate 1 - 999 SEC
F AST STAGE The Fast Stage Delay Timer starts when the Suction Pressure exceeds
DELA Y the Normal Bandwidth. 1 - 999 SEC
SETPOINT The current control setpoint group and value (reference). N/A
SUCTION The current suction pressure (reference). N/A
PRESSURE The current capacity (reference) N/A
CAP ACITY
RECIP MODE The current compressor mode (reference). N/ A
RECIP ST A TE The current compressor state (reference). N/ A
Suction Pressure Control Setpoints Definitions
Process T emperature Control Setpoints
The PROCESS TEMPERATURE CONTROL SETPOINTS screen allows the user to setup the Load and Unload
Controls for Automatic capacity control. The Normal S tage delay and Fast Stage Delay fields are also used for
Capacity changes in the Sequenced mode. Included on this screen is additional reference data to assist the
operator when setting-up the compressor. An example of the screen is shown below.
PROCESS TEMP CONTROL SETPTS hh:mm:ss
LOAD UNLOAD
NORMAL BANDWIDTH XX.X XX.X DEG
CONTROL DEADBAND XX.X XX.X DEG
NORMAL ST AGE DELA Y XX.X XX.X SEC
F AST ST AGE DELA Y XX.X XX.X SEC
SETPOINT S 1 X.X PSIG PT XX.X DEGF
MODE AUTO C P XX.X PCT
STA TE FAILED
Process Temperature Setpoints Screen
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The following table lists the data entry and information fields on the screen and a description of their purposes.
TERM DEFINITION RANGE
NORMAL Adjusts the sensitivity of the time proportional control routine.
BANDWIDTH 0 - 20 DEG
CONTROL The capacity will not be adjusted if the Process Temperature is within
DEADBAND the control deadband. 0 - 20 DEG
NORMAL The Normal Stage Delay Timer starts when the Suction Pressure
ST AGE DELAY exceeds the Control Deadband. When it expires, a stage will be added
or removed as appropriate 1 - 999 SEC
F AST STAGE The Fast Stage Delay Timer starts when the Suction
DELA Y Pressure exceeds the Normal Bandwidth. 1 - 999 SEC
SETPOINT The current control setpoint group and value (reference). N/A
PROCESS TEMPThe current Process Temperature value (reference) N/ A
CAP ACITY The current Capacity (reference) N/ A
RECIP MODE The current compressor mode (reference). N/ A
RECIP ST A TE The current compressor state (reference). N/ A
Process Temp Control Setpoints Definitions
MISC Control
The MISCELLANEOUS CONTROL screen provides setpoints and controls for various system parameters.
Miscellaneous Control Screen
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The following table lists the data entry fields and a description of their purposes.
TERM DEFINITION RANGE
AUTO ST ART/STOP When Auto Start/Stop is Enabled, the compressor ENABLE/
will start and stop automatically in the Automatic and DISABLE
Auto-Remote modes.
POWER F AIL RESART When Power Fail Restart is Disabled, the compressor ENABLE/
will be forced off-line after a power failure occurs. DISABLE
When Enabled, the compressor will be available to
auto-restart as long as the power has not been off for
longer than the Power Fail Restart Delay.
POWER FAIL REST ART This is the maximum amount of time a compressor is 0 - 999 MIN
DELA Y allowed to be without power before being allowed to
auto-restart when the power returns.
ANTI-CYCLE TIME This is the amount of time that the compressor will be 1- 3 0 MIN
able to restart after the STOP hot key is pushed.
Miscellaneous Control Definitions
LOGS Hot Key
The LOGS hot key is fully described in Chapter 3, Logging Functions.
MENUS Hot Key
The MENUS hot key is fully described in Chapter 4, Menu Functions.
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Chapter 3
The Viltech records the systems parameters and conditions for later use in a set of logs. Each log has a
limit on the number of entries that it can store, so as the log fills-up the oldest entries are replaced by the
most recent ones. The system maintains the following standard logs.
Log screens usually contain more data than the LCD display area can show at one time. In order to view
the entire set of information the operator uses the function keys. For the specific working procedure of
log screens please refer to the log screen section in Chapter 1.
Logging Functions
• Operations Log
• Trend Log
• Alarm Log
• Failure Log
• User Log
Logging Functions Technical overview
The following sections will discuss the overall function of each of the five standard logs.
Operations Log
The OPERATIONS LOG displays a list of the system operating conditions for the last hour at 30-
second intervals and has a limit of 255 recorded data entries. An extra entry is made to the Operations Log when special events occur, such as alarms, failures or system reset. When an alarm, failure,
or OEM failure occurs a special indicator is also placed next to the logged parameter causing the
problem. Typically the data recorded in this log will be the analog inputs, system state variables and
alarm information.
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T rend Log
The format of the TREND LOG is identical to the operations log. The Trend Log allows the
user to define the recording interval (Default 15 minutes) and has a limit of 255 recorded data
entries. A special entry is made to the Trend Log when certain events occur similar to the
Operations Log. Indicators and highlighting are used to identify parameters causing alarms
or failures as in the Operations Log.
Alarm Log
The ALARM LOG is a record of the last 100 system alarms. When an alarm first occurs an
alarm entry is made in the log. The process is repeated until the maximum of 100 entries is
reached. Alarms previously logged are then replaced by more recent alarms detected.
Failure Log
The FAILURE LOG is a record of the last 100 failures. When a failure first occurs a failure
entry is made in the log. The process is repeated until the maximum of 100 entries is
reached. Failures previously logged are then replaced by more recent failures detected.
User Log
The USER LOG is a record of the last 50 users who logged on to the system. An entry is
made into this log when a user logs on to the system. The process is repeated until the
maximum of 50 entries is reached. Users previously logged on are then replaced by users
who have more recently logged on
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Logging Functions Operating Procedures
The LOG FUNCTION is accessed by the operator through the LOGS hot key. This hot key allows
the user to view or erase any of the systems available logs. A diagram of the available menu
options under the LOGS hot key is shown below. The operator simply selects the menu item of
the log they wish to access using standard menu screen operating procedures.
LOGS
1. VIEW LOGS
1. OPERA TIONS LOG
2. TREND LOG
3. ALARM LOG
4. F AILURE LOG
5. USER LOG
2. CLEAR LOGS
1. OPERA TIONS LOG
2. TREND LOG
3. ALARM LOG
4. F AILURE LOG
5. USER LOG
3. CLEAR ALL LOG
The following sections will provide an operating overview of the system logs.
1. NO
2. YES
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Operations and T rend Logs
The OPERA TIONS AND TREND LOGS typically store the same parameters. The only difference is the time
interval at which entries are made. The logs will also indicate which parameters have caused an alarm or failure by
placing an indicator next to the responsible parameter. The following table shows the indicators used for each of
the system alarm or failure states.
INDICA TOR ST A TE
A Alarm State
F Failure State
O OEM Failure State
NOTE: The Operations and Trend Logs on compressors only accumulate data when the compressor is running.
However, alarm and failures will still be logged when the compressor is stopped.
The following is an example of the first page of the Operations Log. This particular log has 7 different pages to
display all the data.
PG 1/7 OPERATIONS LOG hh:mm:ss
TIME DATE TYPE
HH:MM:SS AM MM:DD:YY MODES
HH:MM:SS AM MM:DD:YY MODES
HH:MM:SS AM MM:DD:YY MODES
HH:MM:SS AM MM:DD:YY MODES
HH:MM:SS AM MM:DD:YY MODES
HH:MM:SS AM MM:DD:YY MODES
HH:MM:SS AM MM:DD:YY MODES
Operations Log Page
The following data descriptions apply to the Operations and Trend Logs.
P ARAMETER DEFINITION
TIME The time the problem occurred.
DATE The date the problem occurred.
TYPE The type of log entry.
ENTRY DESCRIPTION Description of the log entry if applicable.
ALARM LEVEL The status level of the alarm/failure if one occurred.
DA TA The analogs and other data recorded for the system.
Operations Log Definitions
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Alarm and Failure Logs
The ALARM AND FAILURE LOGS are records of the system alarm and failure conditions.
The screen format is the same for both logs, except for the TYPE column. The following is
an example of the first page of the Alarm log.
PG 1/2 ALARM LOG hh:mm:ss
TIME DA TE TYPE
HH:MM:SS AM MM:DD:YY ALARMS
HH:MM:SS AM MM:DD:YY ALARMS
HH:MM:SS AM MM:DD:YY ALARMS
Alarm Log Page
The Alarm and Failure logs will contain the data described in the following table for each entry .
P ARAMETER DEFINITION
TIME The time the problem occurred.
DATE The date the problem occurred.
TYPE The type of problem that occurred.
Alarm Log Definitions
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User Log
The USER LOG is a record of the last 50 user logon’s for the system. The following is an example of the first page of
a typical User Log screen.
PG 1/2 USER LOG hh:mm:ss
TIME DATE US E R
hh:mm:ss AM mm/dd/yy 0 1
hh:mm:ss AM mm/dd/yy 0 1
hh:mm:ss AM mm/dd/yy 0 1
hh:mm:ss AM mm/dd/yy 0 1
hh:mm:ss AM mm/dd/yy 0 1
hh:mm:ss AM mm/dd/yy 0 1
hh:mm:ss AM mm/dd/yy 0 1
User Log Page
The User log will contain the data described in the following table for each entry.
P ARAMETER DEFINITION
TIME The time the user logged onto the system.
DATE The date the user logged onto of the system.
USER User identification number.
User Log Definitions
Clear Logs
The CLEAR LOGS function is typically not available to the user. A special one-time password is required from
Vilter Manufacturing to access this function. Please contact the Vilter Manufacturing service department if you
desire to clear the logs.
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Clear All Logs
The CLEAR ALL LOGS menu entry provides a method of erasing all the data currently
contained in all the logs available on your system. After choosing to clear all logs the
user will be prompted by a confirmation screen to verify the selection. If the user
decides to continue with the clearing of the logs, a momentary screen will appear with a
message stating that the logs have been erased. The action of clearing the logs
requires a special password. The message “ACCESS DENIED” indicates that the user
does not have privilege to perform this function. If a standard user password will not
allow access to clear the logs, contact your control system provider for assistance.
Set Log Rate
The SET LOG RATES menu entry allows the user to set the rate in minutes for collection of
the logging data. The Trend Log Rate (standard) can be set to the rate in minutes which is
most desirable for your system and operational needs.
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Chapter 4
Menu Functions
The MENUS hot key allows the user to access miscellaneous screens that do not fall under one of the other hot
key categories. The system supports the following four additional menus:
Logon User
Logoff User
Diagnostics
System Set-up
Technical Overview
Additional menus are available for system logon and logoff, basic system information for diagnostic purposes
and set-up of various system parameters, passwords, access levels and initialization sequences.
Logon User
To log onto the system the user selects the LOGON USER option and enters a numeric user
password assigned by the Viltech system manager. Once a password is accepted the system allows
access according to the preset restrictions set by the Viltech according to the access level. Please
review the Screen Access Levels section for an explanation of access levels.
Logoff User
To logoff of the system the user selects the LOGOFF USER menu option. The system then logs the
user off and changes the access levels to the default values. Please review the Screen Access Levels
section for an explanation of access levels.
Automatic Log Off
A user will be automatically logged of f after a 10-minute period of no keyboard activity . The system automatically returns to the main status screen.
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Diagnostics Menu
The DIAGNOSTICS menu option permits the user to view basic information about the system. The information
can then be used to readily troubleshoot problems when they occur. Most of the screens available under this
menu option are view-only screens and information displayed cannot be changed by the user. There are a few
screens available which have selected parameters for which data entry is possible. The menu selections include
System Info, V iew Discrete I/O, V iew Analogs, V iew Network Communications and Override Discrete I/O.
System Information
Selecting SYSTEM INFO will display the System Information screen. Information displayed includes the
dates for last memory initialization and system reset, status on system options such as modem
communications and frame statistics.
View Discr ete I/O
The VIEW DISCRETE I/O screens display discrete Input and Output information from the unit. Channel
assignment, signal name, input/output designation and current state of the signal are displayed for discrete
I/O racks.
View Analogs
The VIEW ANALOGS screens display analog signal information from the unit. Channel assignment, signal
name, current value, units of measurement and hexadecimal equivalent values are displayed.
View Network Comm
The VIEW NETWORK COMM selection displays the current communication status for various units
involved in system communication such as the modem, PC or other network connections. Current status, last
error, total error count and message count are examples of the parameters which may be displayed here.
Override Discrete I/O
The OVERRIDE DISCRETE I/O screen allows the user to set the state of certain discrete outputs. It also
allows the user to simulate certain discrete inputs to an active or inactive state. This feature is for diagnostics
purposes only and will only function if the system is off-line.
NOTE: The user is responsible for knowing the consequences of manual control actions. Please use with
caution.
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Set-up Menu
The SET-UP menu allows the user to perform miscellaneous set-up changes, which are
used to configure the system.
Set Clock
The SET CLOCK screen allows the user to enter the current day and date. The system clock may be set
to a 12 or 24 hour mode.
The correct hour, minute and second for the current time must be entered as 24 hour time.
Calibrate Sensors
T wo types of calibration can be accomplished using the Dynamic or S tatic Sensor Calibration options.
Dynamic Sensor Calibration is selected when the user wishes to change current sensor range values.
Static Sensor Calibration is selected to recall sensor calibration values after a return to factory
configuration or after a system software or hardware change, which would effect sensor calibration.
Dynamic Sensor Calibration
DYNAMIC SENSOR CALIBRATION is the process of adjusting the readings of the Viltech analog
sensors to remove small inaccuracies. The calibration process is performed from the Dynamic Sensor
Calibration screen. The approach used for dynamic calibration divides the sensor range into three
zones. When the value being calibrated is in the upper zone (above 66%) the upper range limit is
allowed to change by a maximum of 5% and the lower range limit remains constant. This is referred to
as a span change. When the value being calibrated is in the lower zone (below 33%) the lower range
is allowed to change by a maximum of 5% and the upper range remains constant. This is referred to
as an offset change. When the value being calibrated is in the middle zone (33% to 66%) both end
points are allowed to move a maximum of 5% (typical) resulting in both a span and offset change.
For best results calibration should be performed both at the operating value and at or near the lower
limit. Several calibration attempts may be required to zero-in on the correct values over the full
operating range.
Static Sensor Calibration
ST A TIC CALIBRA TION is performed to reset or restore sensor calibration values after a hardware,
software or factory configuration change. The previous dynamic calibration results are shown on the
Static Sensor Calibration screen to allow the user to re-enter the values manually or perform a Restore
operation to reset the minimum and maximum range values for the previous calibration results.
Sensors should only be calibrated by qualified personnel and always against devices known to be
accurate. Refer to the information for the Calibrate Sensors screen in the Additional Menus Operating
Procedures section of this manual.
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Passwords
The Viltech system manager will assign user numbers, passwords, screen read and write access levels and screen
access requirements for all users. A user is defined as an individual or group of individuals who will be using the
system. Each user of the Viltech can be assigned a numeric password to define their operating privileges. The
system manager’s password will initially be assigned by Vilter Manufacturing upon system configuration and may
be changed by the system manager if desired. All other users will be assigned a six digit password, which has an
associated read and write access level. A user must enter the numeric password to log onto the system to obtain
access beyond the basic system default access levels. Once a user is finished performing the task required, he may
then logoff manually . If the logoff option is not selected, logof f will occur automatically after a 10 minute period of
no keypad activity.
Adding/Deleting Users
The system manager is able to add or delete users from the V iltech by accessing the ADD/DELETE USER
screen. A user is added by defining a password, read access level and write access level. The higher the
access level the more privileges the individual will have on the system. Access levels will range from 0 to 9,
with the system manager being assigned 9 for full access. The read and write features will each have their
own access level with the left number being the read access level and the right number being the write access
level. The read access level defines the access level at which a user may view a screen. The write access level
defines the access level at which a user may change data on a screen. When a user is deleted this information
is removed from the list. The maximum number of users is 10. When the system is set to Factory
Configuration, User 01 is given a password of 999999 with full access. This should be changed after the
password system is set-up.
Screen Access Levels
The system manager can assign read and write access levels to groups of screens on the Viltech by
choosing the SCREEN ACCESS LEVEL menu selection. The specific screens available for protection will
vary depending on the system configuration. Some examples of screens which might be considered for
limited access are control, setpoint, calibration and initialization screens. Access for screens such as set date
and time and set log rate may be less restricted.
Initialization
The INITIALIZATION menu selection under the Set-up group allows the user to reset the system or restore
factory setpoints.
Power Fail Reset
Choosing Power Fail Reset causes the software to restart using current setpoints as if a power failure occurred.
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Set Factory Configuration
SET FACTORY CONFIG will initialize the system using the preset default factory configuration values. All
the system setpoints and calibration data should be recorded either manually or electronically prior to
performing a Factory Configuration.
Configuration
The CONFIGURATION menu contains menu items which need to be configured once at system startup or which
do not typically require modification.
Display
The DISPLAY set-up screen allows the user to set the units of measure and the
default display configuration.
Communication
The COMMUNICATIONS CONFIGURATION screen (optional) allows the user to set the hardware
communications parameters for the Modbus communications protocol.
Set Operating Status
The SET OPERATING STATUS screen allows the user to reset the runtime and startup information of the
compressor in the event that the data is lost due to a board change or factory configuration operation.
Staging Configuration
The SETUP STAGES screen allows the user to configure the capacity stages for the compressor. The operator can
assign the type of Stage and assign a capacity value for each stage. The type of stages that can be selected are:
None (not used), Loader (energize to load), or Unloader (energize to unload). A capacity value is also assigned to
the fully unloaded condition.
Control Configuration
The Control Configuration screen allows the operator to select refrigerants and enable V iltech options.
Adjust Contrast
The Adjust Contrast screen allows the user to adjust contrast to the display.
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Operational Procedures
A diagram of the screens available under the MENUS hot key is shown below. Note that some screens are
optional and may not be accessible on all compressors.
MENUS
1. LOGON USER
2. LOGOFF USER
3. DIAGNOSTICS
1. SYSTEM INFO
2. VIEW DISC I/O
1. CHANNEL 1-8
2. CHANNEL 9-16
3. VIEW ANALOGS CHANNEL 1-8 CHANNEL 9-16 (T wo stage only)
1. CHANNEL 1-8
2. CHANNEL 9-16
4. COMMUNICA TIONS ST ATUS
5. OVERRIDE 1/O
1. CHANNEL 1-8
2. CHANNEL 9-16
4. SET -UP
1. SET CLOCK
2. CALIBRA TE
1. DYNAMIC SENSOR CALIB.
2. ST A TIC SENSOR CALIB.
3. P ASSWORDS
1. ADD/DELETE USERS
2. SCREEN ACCESS LEVELS
4. INITIALIZA TION
1. POWER F AIL RESET
2. SET F ACTOR Y CONFIG .
3. SETPOINT SA VE/REST ORE
4. SAVE/RESTORE STATUS
5. CONFIGURE HARDWARE
1. DISPLA Y
2. COMMUNICATION
3. SET OPERATING STATUS
4. STAGING CONFIGURATION
5. CONTROL CONFIGURATION
6. ADJUST CONTRAST
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Additional Menus Diagram
Page 95
Logon User
To log onto the system the user selects the LOGON USER option and enters the appropriate
user password. Once a password is accepted the system allows access according to the
restrictions preset by the V iltech system manager . Below is an example of a logon.
Logon User Screen
The following table lists the data entry fields and a description of their purpose.
TERM DEFINITION RANGE
PASSWORD The designated password for a particular user. 0-999999
Logon User Definitions
NOTE: The password is not displayed when typed. Instead, “*” characters are displayed to avoid
anyone overseeing the typed password.
Logoff User
T o logoff of the system the user selects the LOGOFF USER menu option. A temporary
screen will then appear to signal the initiation of the logoff. The system then logs the
user off and changes the access levels to the default values. The system automatically
returns to the main status screen. A user will be automatically logged off after a 10
minute period of no keyboard activity.
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Diagnostics
The DIAGNOSTICS menu option permits the user to view and in some cases alter basic information about the
system. The menu selections include viewing System Information, V iewing IO, Analogs; and viewing Network
Communications.
Diagnostics Screen
System Information
The SYSTEM INFORMATION screen is used to provide the user with the system options and software configuration
status. An example of a System Information screen is shown below.
SYSTEM INFORMA TION hh:mm:ss
VIL TER MANUFACTURING, LLC. COPYRIGHT 2001
VIL TER Standard Recip: V1.00
BUILD DA TE : day mm/dd/yy hh:mm:s s
INIT DA TE : day mm/dd/yy hh:m m: s s
RESET DA TE : day mm/dd/yy hh:mm: s s
CURNT TIME : day mm/dd/yy hh:mm: s s
OPTIONS : R2 2 SE Q ARMT PT NETW
TIMER ST A TUS : MAX: XXXX XXXX XXXX XXXX
USED X OF X A VG: XXXX XXXX XXXX XXXX
MAX XX MIN: XXXX XXXX XXXX XXXX
System Information Screen
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The following table lists the various parameters displayed on the screen.
P ARAMETER DEFINITION
VIL TER, INC. The name and version number of the installed software.
RECIP COMP . VO.XX
BUILD DATE The date the system was last built.
INIT DA TE The date the system was intiaited.
RESET DA TE The date and time the system was last reset.
CURNT TIME The current date and time for this panel.
OPTIONS The status of various options are shown on the lower section of the screen.
TIMER ST ATUS The number of timers currently being used, the total number of available timers,
and the maximum number of timers used since the last reset.
System Information Definitions
View Discr ete I/O
The V iew Discrete I/O screens are information screens used for viewing purposes only as shown in the following
example.
NOTE: The I/O channels are used for optional equipment.
Discrete I/O Rack 1A Screen
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Discrete I/O Rack 1B Screen
The following table lists the various parameters displayed on the screen.
P ARAMETER DEFINITION
CH The discrete channel number
NAME The name of the discrete signal.
I/O Shows whether the discrete is an input or an output.
ST A TE The current state of the discrete signal.
Discrete I/O Rack Definitions
View Analogs
The VIEW ANALOG Inputs screen can be viewed by the operator and will be displayed on a screen similar to the
following example.
Analog Inputs Screen (Channels 1-8)
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The following table lists the various parameters displayed on the screen.
P ARAMETER DEFINITION
CH The analog channel number.
NAME The name of the analog signal.
V ALUE The decimal value of the analog input.
HEX The hexidecimal value of the analog input.
Analog Input Definitions
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Communication Status
The Communication S tatus screen allows the user to monitor the status of the system’s communication links. The
screen shown below is an example of a Communication Status screen.
COMMUNICA TION ST A TUS hh:mm:ss
MODEM PC MASTR DF1
STA TUS FAIL FAIL FAIL FAIL
LAST ERR
TOTAL ERR XXXX XXXX XXXX XXXX
MSG COUNT XXXX XXXX XXXX XXXX
VILTE R DF 1 MODBUS NETWORK
UNIT: X UNIT: X UNIT X IN CTRL: NO
Communication Status Screen
The following table lists the various parameters displayed on the screen.
P ARAMETER DEFINITION
ST ATUS The status of the link to a specific unit, either pass or fail. MODEM indicates
the status for the optional modem link, PC indicates the status for the optional
PC or Modbus connection, Master indicates the status for an optional.
LAST ERR The last error message received from each unit. The field is blank if no errors
have been received.
TOT AL ERR A hexadecimal counter of the total number of errors received by each unit.
Time-out errors do not increase the total. The counter rolls over at FFFF.
MSG COUNT A hexadecimal counter of the number of messages received by each unit. The
counter rolls over at FFFF .
VIL TER UNIT NUMBER The unit number for use when the compressor is communicating with a Vilter
master panel.
MODBUS UNIT NUMBER The Unit Number used when the compressor is communicating using the
NETWORK IN CONTROL Indicates that the Network master is in control of the compressor.
Communication Status Definitions
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Modbus communication protocol.
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