Watlow 935A User Manual
0600-0015-0000 Rev L $15.00
January 2002
Supersedes: 0600-0015-0000 Rev K
User’s Manual
Registered Company
Winona, Minnesota USA
TOTAL
3 Year Warranty
CUSTOMER
SATISFACTION
Series 935A
Temperature Controller
with Countdown Timer
1241 Bundy Boulevard, P.O. Box 5580, Winona, Minnesota USA 55987-5580
Phone: +1 (507) 454-5300, Fax: +1 (507) 452-4507, http://www.watlow.com
U.S. English
Safety Information in this Manual
Note, caution and warning symbols appear throughout this book to draw your attention to
important operational and safety information.
A “NOTE” marks a short message to alert you to an important detail.
A “CAUTION” safety alert appears with information that is important for protecting your
equipment and performance.
A “WARNING” safety alert appears with information that is important for protecting you,
others and equipment from damage. Pay very close attention to all warnings that apply to
your application.
The ç symbol (an exclamation point in a triangle) precedes a general CAUTION or
WARNING statement.
The Ó symbol (a lightning bolt in a lightning bolt in a triangle) precedes an electric
shock hazard CAUTION or WARNING safety statement.
Technical Assistance
If you encounter a problem with your Watlow controller, review all configuration information to verify that your selections are consistent with your application: inputs; outputs;
alarms; limits; etc. If the problem persists after checking the above, you can get technical
assistance by calling your local Watlow representative (see back cover of this manual), or
in the U.S., dial +1 (507) 454-5300. For technical support, ask for an Applications
Engineer.
Please have the following information available when you call:
• Complete model number • All configuration information
• User’s Manual • Diagnostic menu readings
Warranty and return information is on the inside back cover of this manual.
Your Comments
Your comments or suggestions on this manual are welcome. Please send them to the Technical Literature Team, Watlow Winona, 1241 Bundy Boulevard, P.O. Box 5580, Winona,
Minnesota, 55987-5580 U.S.; Telephone: +1 (507) 454-5300; fax: +1 (507) 452-4507.
Copyright January 2002 by Watlow Winona, Inc., with all rights reserved. (2190)
ç
Safety Alert
CAUTION or
WARNING
∫
Electrical Shock
Hazard
CAUTION or
WARNING
Watlow Series 935A User’s Manual 1
Where to find it…
Table of Contents
Item ............................................................. Page
Introduction ........................................................ 2
How Keys Work ................................................. 4
Begin Controlling ................................................ 6
Set Point Change ............................................... 7
Simple Error / Response .................................... 8
Software Map; Learn ......................................... 9
Operations Menu; Learn .................................. 10
PID Menu; Learn ...............................................12
Configuration Menu; Learn .............................. 16
Lockout Functions ............................................ 18
Setting Up Inputs and Outputs ........................ 20
Remote Set Point ..............................................22
Front Panel Lockout ......................................... 23
Alarms; Learn ................................................... 24
Alarms; Setting and Clearing ........................... 26
Timer; Learn ..................................................... 28
Timer; Setting ................................................... 30
Timer Example ................................................. 31
Auto-tuning ....................................................... 32
PID Fine tuning ................................................ 33
Calibrating ........................................................ 34
Errors and Troubleshooting ............................. 36
Mounting ...........................................................38
Dimensions .......................................................39
Installing ............................................................40
Terminal Block Removal ...................................41
Wiring ............................................................... 42
Wiring Examples .............................................. 44
Glossary ........................................................... 46
Index ................................................................ 48
Specifications ................................................... 50
Ordering Information ........................................ 51
Declaration of Conformity ................................ 52
Software Map ................................................... 55
How to Reach Us ............................... back cover
Table Numbers ............................................Page
1 Output Functions ....................................... 3
2 Error Messages and Action ...................... 8
3 Software Organization ............................. 9
4 Operations Menu Overview .................... 11
5 PID Menu Overview ............................... 14
6 Configuration Overview .......................... 16
7 Lockout Options ..................................... 19
8 Setting Inputs and Outputs .................... 21
9 Using Front Panel Lock .......................... 23
10 Alarm Functions ..................................... 25
11 More Alarm Functions ............................ 27
12 Timer Functions/Settings ........................ 29
13 Error Codes and Actions ........................ 37
14 Troubleshoot Outputs ............................... 37
15 Input Range Information ......................... 51
Figure Numbers ..........................................Page
1 Input and Output Overview ...................... 3
2 Front Panel Functions .............................. 5
3 Begin Controlling ...................................... 6
4 Changing the Set Point ............................ 7
5 Remote Set Point Wiring ........................ 22
6 Front Panel Lock Wiring ......................... 23
7 Auto-tuning ............................................. 32
8 Calibrating .............................................. 34
9 Panel Cut-out Dimensions ..................... 38
10 Knockout Template ................................. 38
11 Dimensions ............................................ 39
12 Case Top View and Collar ...................... 40
13 NEMA 4X/IP65 Seal ............................... 40
14 Terminal Block Removal ........................ 41
15 Wiring ..................................................... 42
16 System Wiring Example ......................... 44
17 Ladder Diagram Example ...................... 45
2 Watlow Series 935A User’s Manual
Welcome to the Watlow Series 935A!
General Description
The Series 935A is a temperature controller with countdown timer for industrial, commercial, or scientific applications. It offers 1/32
DIN panel-mounting, digital indication, single temperature sensor input from a thermocouple or RTD, and dual control outputs. Outputs
may operate in combinations of heat or cool, and alarm or timer.
Special Features
• Easy to use operator interface and user’s manual
• Compact panel footprint; 1/32 DIN size
• Water and corrosion proof; IP65/NEMA 4X rated
• Reliable; built to UL, CUL approved safety standards with a three year warranty
• Accuracy with economy
• Universal power supply for worldwide application
Unique Features
The Series 935A Output 1 can be configured as a remote set point input for a multi-loop control system, or, as an alternative, that
output can be a front panel lock with your switch to further reinforce the 935A’s lockout capability. The Series 935A timer functions
include heat/timer or cool/timer countdown modes in hours:minutes or minutes:seconds.
Introduction
Watlow Series 935A User’s Manual 3
Output 1
Output 2
RDY
2
1
SET
Single
Input
Dual Output
Single Input
Type J, K, T, N, S, E Thermocouple, 1° RTD, or 0.1° RTD
Output 1
Switched dc
Heat Cool Alarm Remote
Set Point
SET
Front
Panel
Lockout
NONE
None
Heat Cool Alarm
30
15 45
0
Timer
(Hr:Min or
Min:Sec)
NONE
None
Output 2
Electromechanical Relay, Switched
dc or Solid-state Relay
Table 1 - Valid Output Functions
First select Output 1: Then select Output 2:
Heat None, Cool, Alarm, Timer
Cool None, Heat, Alarm, Timer
Alarm None, Heat, Cool
Remote Set Point Heat, Cool
Front Panel Lock Heat, Cool, Alarm
None Heat, Cool, Alarm
• The function of Output 1 determines
the options available for Output 2.
• First select the function of Output 1.
Refer to the table (right), then select
the function of Output 2.
Figure 1 - Series 935A Input and Output Overview
4 Watlow Series 935A User’s Manual
Read or change
You can simply:
• Read the normally displayed actual temperature,
or…
• Press and hold ß to read the set point,
or…
1. Press and hold . and , simultaneously for three seconds to move to a software menu.
2. Press and hold ß to display a choice or value.
3. While continuing to press ß, press . or , to choose new data or select a new value.
4. Release ß and the arrow key to complete the change.
NOTE: The normally displayed actual temperature and set point can be altered to show different combinations of actual
temperature, set point temperature, or time in hours:minutes or minutes:seconds. See [dISP] p. 16.
RDY
2
1
SET
Seven-segment
alphanumeric display:
• Shows process value,
set point information, time, or
• Shows prompt name or value,
depending on the key
combination pressed.
Set Key: ß
• Configurable to shift between
normally-displayed value and set
values. See [dISP], p.16.
• Clears a latched alarm.
LED 1:
Lit when Output 1 is active.
LED 2:
Lit when Output 2 is active.
RDY:
Lit when the process temperature
is inside the timer ready band.
Up / . (Increment)
Down / ,
(Decrement) Arrow Key:
• Selects new information when Set
Key is pressed.
• Steps through software menus and
parameters.
• Starts and stops the timer.
• To set up the control, go to the
Easy Software Map, p. 9.
Figure 2 - Series 935A Front Panel Functions
Watlow Series 935A User’s Manual 5
6 Watlow Series 935A User’s Manual
Begin Controlling
1. Apply power to the system.
A properly-wired Series 935A will begin controlling the thermal system as soon as you apply power to it.
2. Look at the Series 935A’s display. It is reading actual temperature, set point temperature, or time.
• To change set point, go to p. 7.
• The Series 935A will auto-tune when you tell it to, go to p. 32.
• If you see an error, go to p. 8.
System
Power
RDY
2
1
SET
Figure 3 - Begin Controlling
Watlow Series 935A User’s Manual 7
Change Set Point
RDY
2
1
SET
Your Series 935A displays the actual process temperature when it comes from the factory. You can change it to normally display
the set point or time. Go to p. 16, see [dISP].
1. Press and hold ß.
2. Press one of the arrow keys to alter the set point either upward or downward.
3. Release ß to complete the change.
Figure 4 - Changing the Set Point
8 Watlow Series 935A User’s Manual
Respond to a simple error
Display Probable Cause Recommended Action
Reversed thermo- Change the sensor
couple connection leads on Terminals
+ to –. 1 and 2.
Sensor type Go to {`In} prompt, check
mismatch selection (see p. 20), or check
or open RTD. RTD, replace as necessary.
Sensor type Go to {`In} prompt,
mismatch. check selection
(see p. 20).
Open Thermocouple, Check the sensor,
bad connection, or replace as
broken wire. necessary.
Electrical noise. Cycle power to system. See if error
clears. Check system for electrical
interference.
Control is inoperable. Check for line voltage at
terminals 7 and 8.
RDY
2
1
SET
• Simply correct the cause.
• Errors are non-latching
and self-clearing.
• For advanced error and
troubleshooting
information, go to p. 37.
If You See An Error Code:
1. Be aware that most errors are input (sensor) related.
2. Read the table below and follow its recommendations.
Table 2 - Error messages and recommended action
[`Er1]
[`Er2]
[`Er3]
[`Er4]
[`Er5]
[````]
Watlow Series 935A User’s Manual 9
Software Organization
• The Series 935A has three primary menus in addition to a normal display.
• The software reverts to the normal display after 60 ± 5 sec.
Table 3 - Software Organization
• At the [`pid] or [Cnfg] prompt, press and hold the ß key, and the . or , key to select [`yes]. Release the keys to
move to the new menu.
Navigation Example
Learn the Software Map
,
,
,
• To access the Operations Menu, press the
. and , keys simultaneously for three seconds.
• Move through each menu with the . or , key.
• Make changes by pressing and holding the ß key, and
then the . or , key to select a new choice or
value. Release the keys to complete the change.
• To exit any menu: Press and hold the
. and , keys for three seconds,
or
the display will revert to normal display
after 60± 5 seconds.
[Prnc] [Prno [dEnc [dEno
[`Ot2]
[disp]
[Alty]
,
.
.
.
,,,,
Display
Actual Temperature, Set Point, or Time Remaining
Operations, p. 10
Start / Stop:
•Autotune
Set:
•Alarm Ranges
•Countdown Timer
•Idle after Timer
Select
Set Point Type:
Go to:
PID Menu
Configuration Menu
[`yes]
[`yes]
PID, p. 12
Set:
•Heat PID Functions
•Dead Band
•Cool PID Functions
•Calibration Offset
Configuration, p. 16
Set:
•Inputs / Functions
•Output Types
•Display Default
•Alarms / Functions
•Timer Functions
•Failure Mode
•Lockout Functions
10 Watlow Series 935A User’s Manual
The Series 935A Operations Menu is the first menu you encounter when you press the . and , keys simultaneously for three
seconds. The Operations Menu provides a location to initiate the following actions or complete the following tasks:
• Auto-tune [`Aut]: Start or stop the auto-tuning process. Auto-tuning selects a set of viable proportional, integral, and derivative
values for heat and/or cool output.
• Alarm Points, [`ALO] and [`AhI]: Select the values for the high alarm point and the low alarm point. Alarm points, dependent
on sensor type high and low ranges, reside in the Operations Menu for easy access.
• Timer Countdown Time [tMr]: Select a countdown time value between 00:00 and 99:59 hours:minutes or minutes:seconds.
Time interval choices [thM] and [tMS] reside in the Configuration Menu for Output 2.
• Idle Set Point [IDLE]: [trAc] or an adjustable value between [``rL] and [``rh]. Choose to have the Idle Set Point track
[trAc], or equal, the Primary Set Point; or select an Idle Set Point value in °F or °C between the range low [``rL] and range
high [``rh] values. The Idle Set Point is active both before and after the timing sequence. The normal or Primary Set Point controls during the timing sequence.
• Local/Remote Set Point [`L-r], [```L] or [```r]: Choose to maintain control with the Primary [```L] (local) Set Point, or to
enable the Remote [```r] Set Point if the Output 1 [`Ot1] choice equals Remote Set Point [`rSP].
• Go to the PID Menu [`Pid]: Choose [`YES] to proceed to the PID Menu.
• Go to the Configuration Menu [CnFg]: Choose [`YES] to proceed to the Configuration Menu.
The table on the next page presents this information in graphic form.
NOTE: Not every prompt listed here or on p. 11 in the Operations Menu will appear in your unit. Prompts vary with
lockout function and output set-up. Whether or not prompts appear in the Operations Menu depends on two features of
the Series 935A:
• Lockout function; the Lockout Tag [`tAg] function masks prompts from view in the various menus. (If you cannot see a prompt,
you can make no change.) See Using Lockout Functions, p. 18, for more information.
• Output 1 and 2 Configuration; some outputs are mutually exclusive. For example, if Output 1 is Alarm, then Output 2 cannot be
Timer. Therefore, the Operations menu will have no timer-related prompts. See the Valid Output Functions Table, p. 3, or Setting
Up Inputs and Outputs, p. 20.
Learn the Operations Menu
Watlow Series 935A User’s Manual 11
Table 4 - Operations Menu Overview
To enter the Operations Menu, press the . and , keys simultaneously for three seconds.
Auto-tune - Start the auto-tune action to automatically select a set of viable PID values; [tunE] will flash during auto-tuning.
[``no] [`YES]
NO YES
Alarm Low - Select a low alarm point, adjustable between Off, Range Low and Alarm High.
[`AhI]
Alarm High
Alarm High - Select a high alarm point, adjustable between Alarm Low and Range High, or OFF.
[`ALO]
Alarm Low
Countdown Timer - Select a countdown time duration.
[0)º0] [9959]
00:00 to 99:59 Hrs:Min or Min:Sec
Idle Set Point Type - Choose to track set point, or select a separate idle set point adjustable between Range Low and Range High. When [`Ot1]
= [thM] or [tMS], view the idle set point from the set point display with a three second ßpress.
[trAc] [``rL] [``rh]
Track Range Range
Set Low High
Point
Local / Remote Set Point - Choose to use the remote set point input.
[```L] [```r]
Local Remote
PID Menu - Go to the PID Menu.
[``no] `YES]
NO YES
Configuration Menu - Go to the Configuration Menu.
[``no] `YES]
NO YES
[`Aut]
[`ALO]
[`AhI]
[tMr]
[IDLE]
[`L-r]
[`Pid]
[CnFg]
12 Watlow Series 935A User’s Manual
Choose the PID Strategy
You may rely solely on the Auto-tune [`Aut] function (p. 32) and factory defaults to determine PID values for your system, or you may
use auto-tuning and additional manual adjustments. You must select dead band [``db] and calibration offset [`CAL] values manually.
The Series 935A PID Menu is the first sub-menu you encounter after moving to the Operations Menu. The PID Menu provides a software location to select the individual heat or cool proportional band, hysteresis, and cycle time values; and the dead band, integral,
derivative, and calibration offset values.
To go to the PID Menu:
1. Go first to the Operations Menu by pressing . and , simultaneously for three seconds.
2. Scroll through the Operations Menu with , until you see the [`Pid] prompt.
3. While pressing ß to display [``no], choose [`YES] with . or ,.
4. Release ß to see the first PID prompt.
NOTE: Access to the PID Menu and the prompts there varies with lockout function and output set-up. The PID Menu is
locked out when the 935A leaves the factory.
• Lockout function; the Lockout Tag [`tAg] function masks menus from view (if you cannot see a prompt, you can make no
change). See Using Lockout Functions, p. 18.
• Output set-up; you must choose [hEAt] or [COOL] in either Output 1 or Output 2 to have access to the PID Menu. With a [hEAt]
only choice, [COOL] prompts are not visible, and vice versa. See the Valid Output Functions Table, p. 3, or Setting Up Inputs and
Outputs, p. 20.
NOTE: Proportional Band, Integral, Derivative, Dead Band, and Calibration Offset values are adjustable in whole or tenth
°F or °C, depending on input type [``In] and [`C_F] Celsius/Fahrenheit Configuration Menu choices.
Learn the PID Menu
Watlow Series 935A User’s Manual 13
Set the PID Menu Values
• Proportional Band, Heat and Cool [Pb`h] and [Pb`c]: Select a value (degrees) to set up band on either side (±) of the
Primary Set Point in which the heat and/or cool proportioning function(s) will be active.
For on/off control, set [Pb`h] or [Pb`c] = 0.
Range: 0 to 999°F/555°C, or 0.0 to 999.0°F/555.0°C
Default: 25°F/17°C, or 25.0°F/17.0°C
• Hysteresis, Heat and Cool [hYSh] and [hYSc]: For use with on/off control only. Select the value (degrees) for the process vari-
able change required to re-energize the control heat and/or cool output.
For ON/off control, set [Pb`h] or [Pb`c] = 0.
Range: 1 to 999°F/555°C, or 0.1 to 999.0°F/555.0°C
Default: 3°F/2°C, or 3.0°F/2.0°C
• Cycle Time, [Ct`h] and [Ct`c]: Select the value (seconds) required for the heat and/or cool output(s) to complete a full ON
through off cycle.
Range: Switched dc/Solid State Relay: 0.1 to 60.0 seconds
Default: 5.0 seconds
Range: Electromechanical Relay: 5.0 to 60.0 seconds
Default: 30.0 seconds
• Dead Band [``db]: Dead Band adjusts the effective cool set point above the primary set point by the Dead Band value in de-
grees. This creates a band between the heating and cooling proportional bands where only integral and derivative activity will
occur. For more information on Dead Band fine tuning, go to p. 33.
Range: 0 to 999°F/555°C, or 0.0 to 999.0°F/555.0°C
Default: 0°
• Integral [``It]: Select a value (minutes/repeat) for the integral function. Integral is the inverse of Reset; It(value) =
1/Reset(value).
Range: 0.00 to 99.99 minutes/repeat
Default: 5.00 minutes/repeat
• Derivative [``dE]: Select a value (minutes) for the derivative function.
Range: 0.00 to 9.99 minutes
Default: 0.00 minutes
• Calibration Offset [`CAL]: Eliminates the difference between the displayed process temperature and the actual process temper-
ature value.
Range: -999 to 9999°F/C, or -99.9 to 999.9F/C
Default: 0°
14 Watlow Series 935A User’s Manual
Table 5 - PID Menu Overview
Set-Up Heat
Proportional Band Heat - Select a heat proportional band value.
[```0] [`999] [```0] [`555] [``)0] [99(0] [``)0] [55%0]
0°F to 999°F, or 0°C to 555°C, or 0.0°F to 999.0°F, or 0.0°C to 555.0°C
Hysteresis Heat - Select a heat ON/off control switching hysteresis.
[```1] [`999] [```1] [`555] [``)1] [99(0] [``)1] [55%0]
1°F to 999°F, or 1°C to 555°C, or 0.1°F to 999.0°F, or 0.1°C to 555.0°C
Cycle Time Heat - Select a cycle time for the heat output.
[``)1]
[`6)0] [``%0] [`6)0
0.1 to 60.0 seconds 5.0 to 60.0 seconds
(SSR or Switched dc) (Electromechanical Relay)
Dead Band - Select a dead band value.
[```0] [`999] [```0] [`555] [``)0] [99(0] [``)0] [55%0]
0°F to 999°F, or 0°C to 555°C, or 0.0°F to 999.0°F, or 0.0°C to 555.0°C
Set-Up Cool
Proportional Band Cool - Select a cool proportional band value.
[```0] [`999] [```0] [`555] [``)0] [99(0] [``)0] [55%0
0°F to 999°F, or 0°C to 555°C, or 0.0°F to 999.0°F, or 0.0°C to 555.0°C
Hysteresis Cool - Select a cool ON/off control switching hysteresis.
[```1] [`999] [```1] [`555] [``)1] [99(0] [``)1] [55%0
1°F to 999°F, or 1°C to 555°C, or 0.1°F to 999.0°, or 0.1°C to 555.0°C
Cycle Time Cool - Select a cool output cycle time.
[``)1] [`6)0] [``%0] [`6)0
0.1 to 60.0 seconds 5.0 to 60.0 seconds
(SSR or Switched dc) (Electromechanical Relay)
[Pb`h]
[hySh]
[Ct`h]
[``db]
[Pb`c]
[hySc]
[Ct`c]
Learn the PID Menu - Details
Watlow Series 935A User’s Manual 15
Set-Up General
Integral Function - Select an integral value.
[`)00] [9(99]
0.00 to 99.99 minutes/repeat
Derivative Function - Select a derivative value.
[`)00] [`(99
0.00 to 9.99 minutes
Calibration Offset - Select a calibration offset value.
[-999]] [9999] [-9(9] [99(9
-999° to 9999°F or C or -99.9° to 999.9°F or C
Note: Access to the PID Menu and the prompts there varies with lockout function and output set-up. The PID Menu is
locked out when the 935A leaves the factory.
• Lockout function; the Lockout Tag [`tAg] function masks menus from view (if you cannot see a prompt, you can make no
change). See Using Lockout Functions, p. 18.
• Output set-up; you must choose [hEAt] or [COOL] in either Output 1 or Output 2 to have access to the PID Menu. With a
[hEAt] only choice, [COOL] prompts are not visible, and vice versa. See the Valid Output Functions Table, p. 3, or Setting Up
Inputs and Outputs, p. 20.
[``It]
[``dE]
[`CAL]
16 Watlow Series 935A User’s Manual
The Configuration Menu is the second sub-menu in the Operations Menu. Use it to set Inputs, Ranges, Output Types, Alarms, Timer,
Failure Mode, and Lockouts.
To go to the Configuration Menu:
1. Go first to the Operations Menu by pressing . and , simultaneously for three seconds.
2. Scroll through the Operations Menu with , until you see the [CnFg] prompt.
3. While holding ß to display [``no], choose [`YES] with . or ,.
4. Release ß to see the first [CnFg] prompt, [``In].
5. To leave the Configuration Menu, press . and , for 3 seconds.
Table 6 - Configuration Menu Overview
Input Type - Choose sensor type. See p. 21 for sensor ranges.
[```J] [```H] [```t] [```n] [```E] [```S] [`rtd] [`r†d]
J t/c K t/c T t/c N t/c E t/c S t/c 1.0° RTD 0.1° RTD
Celsius/Fahrenheit - Choose displayed unit of measure.
[``°F] [``°C]
°F °C
Input Range Low - Select lowest displayable set point. Ranges, p. 21.
[``In] [``rh]
Select a value (lowest displayable set point) between
Input Type Range Low and Input Range High.
Input Range High - Select highest displayable set point. Ranges, p. 21.
[``Rl [``In]]
Select a value (highest displayable set point) between
Input Type Range High and Input Range Low.
Output 1 Function - Choose Output 1 type; see Valid Outputs Table, p. 21.
[hEAt] [COOL] [ALM] [`rSP] [`FPL]] [nonE]]
Heat Cool Alarm Remote Front None
Set Point Panel Lock
Output 2 Function - Choose Output 2 type (dependent on Output 1 choice).
hEAt] [COOL] [ALM] [thM] [tMS] [nonE]]
Heat Cool Alarm Timer Timer None
Hr./Min. Min./Sec
Display Default -
Choose the primary (last 2 characters) and secondary (first 2 characters) default displays. Press ßto toggle to the secondary display
for 15 seconds.
[``Ac] [AcSP] [Acti] [tiAc] [tiSP]
No Actual Actual Time Time remaining
secondary temp. temp. remaining Set point temperature
Actual Set point Time Actual
temp. temp. remaining temp.
Alarm Type - Choose alarm type with output action.
[Prnc] [Prno] [dEnc] [dEno]
Process Process Deviation Deviation
normally normally normally normally
closed open closed open
[``In]
[`C_F]
[``rL]
[``rh]
[`Ot1]
[`Ot2]
[dISP]
[ALty]
Learn the Configuration Menu
Watlow Series 935A User’s Manual 17
NOTE:
Access to Configuration Menu varies with lockout function. See p. 19.
Alarm Hysteresis - Choose alarm switching band.
[```1[ [`999] [```1] [`555] [``)1] [99(0] [``)1] [55%0]
1°F to 999°F, or 1°C to 555°C, or 0.1°F to 999.0°F, or 0.1°C to 555.0°C
Alarm Latch - Choose latching or non-latching alarms.
A latching alarm requires a ß press to clear it after the alarm condition clears.
[``no] [`YES]
NO YES
Alarm Silencing - Choose to silence alarms on startup, or not.
[`SIL] = [`YES] silence an alarm with a ß press.
[``no] [`YES
NO YES
Failure Mode - Choose output action after a sensor failure.
Bumpless transfer provides a smooth transition to percent power control without output state change.
[bPLS] [-100] [`100]
Bumpless Percent Power
Timer Output Function - Choose output function for the end of the timer.
Delay ON = Turn ON, Delay Off = Turn off, Signal ON = Toggle ON, Signal off = Toggle off
[dLon] [dLoF] [SGon] [SGof]
Delay Delay Signal Signal
on Off On Off
Start Timer Function - Choose the start timer conditions:
[IMd] = Immediate start on a , press; [`rdy] = , press and Actual temp. is inside the Ready Band;
[rdYA] = , press, plus Actual temp. is inside the Ready Band, then acknowledge with a ß press;
[PWr] = immediate start on power-up without waiting for the Ready Band temp. or a , press.
[IMd] [`rdY] [rdYA] [PWr]
Immediate Ready Ready Power
Acknowledge
Timer Ready Band - If [Strt] =[`rdY] or [rdYA], select ready band high/low values.
[```0] [`999] [```0] [`555] [``)0] [99(0] [``)0] [55%0]
0°F to 999°F, or 0°C to 555°C, or 0.0°F to 999.0°F, or 0.0°C to 555.0°C
Signal Time - If [tIM] = [SGon] or [SGoF], select a Signal ON or Signal off time duration to trigger an annunciator or other action at completion of
countdown time.
[```1] [9959]
1 sec. to 99:59 min:sec.
Set Point Lock - Choose to lock the Primary Set Point from change, not view.
[``no] [`YES]
NO YES
Lockout Tag - Choose undisplayable/unchangeable menus; [PCOA] = all locked.
[PCOA] [PCO`] [PC`A] [PC``] [P`OA] [P`O`] [P``A] [P```]
[`COa] [`CO`] [`C`A] [`C``] [``OA] [``O`] [```A] [````]
Choose the menus / function that will not be displayed, and therefore cannot be changed.
P = PID Menu, C = Configuration Menu (except [`tAG]), O = Operations Menu (except [CnFG]), A = Auto-tune.
[AhyS]
[`LAt]
[`SIL]
[FAIL]
[tIM]
[Strt]
[`rdy]
[``St]
[SLOC]
[`tAg]
18 Watlow Series 935A User’s Manual
The Series 935A offers three different security, or “lockout,” options. Set up one or all three lockout options in the Configuration Menu.
∫
• Front Panel Lock [`FPL] uses a control output as an input for an external hardware switch; it
requires wiring, see p. 23. Choose Front Panel Lock [`FPL] as an exclusive Output 1 choice.
Output 2 offers heat, cool, or alarm.
• Choose Set Point Lock [SLOC] as the simplest lockout option. It locks the Primary Set Point
from change, but not from view.
• Choose the Security Tag [`tAG] as a means of masking the Series 935A software menus from
view. By selecting all or part of the four-digit binary acronym, [PCOA] (Proportional / Configuration
/ Operation / Auto-tune), you can choose to mask those items from view, and therefore from
change. For example: In the Configuration Menu [`tAG] set-up, if you can see the P, the operator cannot see the PID menu.
• Exceptions to [PCOA] [`tAG] are:
“C” does not lock out [`tAG].
“O” does not lock out [CnFG].
∫
WARNING: When Output 1 is a Front Panel Lock [`OT1] = [`FPL] , the output is energized!
Do not connect a power switching device to Output 1; injury or death or damage to
equipment or property could result.
Configuration Menu
[``In]
Input Type
[`C_F]
Celsius/Fahrenheit
[``rL]
Input Range Low
[``rh]
Input Range High
[`Ot1]
✓
Output 1 Function
[`Ot2]
Output 2 Function
[dISP]
Display Default
[ALty]
Alarm Type
[AhYS]
Alarm Hysteresis
[`LAt]
Alarm Latch
[`SIL]
Alarm Silencing
[FAIL]
Failure Mode
[tIM]
Timer Function
[Strt]
Start Timer
[`rdY]
Timer Ready Band
[``St]
Signal Time
[SLOC]
✓
Set Point Lockout
[`tAG]
✓
Lockout Tag
Using Lockout Functions
Watlow Series 935A User’s Manual 19
View Process Yes Yes Yes Yes Yes Yes Yes
View Set Point Yes Yes Yes Yes Yes Yes Yes
Change Set Point No Yes No Yes Yes Yes Yes
Auto-tune No
Yes Yes Yes Yes Yes
No
View, Change Operation Menu No
Yes Yes Yes Yes
No Yes
View, Change Configuration Menu
(except tag) No Yes Yes Yes No Yes Yes
View, Change PID No Yes Yes No Yes Yes Yes
= No Lockout
= Fully Locked
= Operator's
Perspective
Set Point LockoutFront Panel Lockout Security Tag
Three
Lockout
Options
Note: Front Panel Lockout requires an external hardware
switch. For [`FPL] set-up and wiring information, see p.
23. For more wiring information, see p. 43.
P = PID Menu
C = Configuration Menu (except [`tag])
O = Operations Menu (except [CnFG])
A = Auto-tune
Table 7 - Series 935A Lockout Options
[`Ot1] [SLOC] [`tAG]
[`fpl]
[`YES] [P```] [`C``] [``O`]
[[```A]
[``no]
[`fpl]
SET
1
2
RDY
[slOC]
[````]
[PCOA]
SP
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