Extech Instruments 96VTR Instruction Manual

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INSTRUCTION MANUAL

Model 96VTR

¼ DIN Process Controller

1. INTRODUCTION

The 96VTR is a microprocessor-based device which can compare a process input
(thermocouple, RTD, or analog input) to a user-programmable setpoint and adjust the
process (via relay or analog outputs), to bring the process to the desired setpoint. This Three­Mode PID controller offers:

 Simultaneous Process Value (PV) and Setpoint Value (SV) display
 Automatic alarm functions (11 in all)
 Autotuning automatically tailors the controller's response to a specific process
 Security lock-out
 Ramp-to-Setpoint and Soak functions
 Input selectability
 Optional RS-485 PC interface

2. SPECIFICATIONS

2.1 General Specifications

Display Dual 7-segment 4-digit LED Displays: Red (PV), Green (SV)
LED Status Indicators Control outputs (C1, C2), Alarm outputs (A1, A2), Autotune (AT),

Manual mode (MA), and temperature units

oC/o

F

Display range (span) -1999 to 9999 counts max (Programmable; limited by the range

specified in Section 2.2 for each individual input type)
Indicating Accuracy +0.2% Full Scale +1 digit
Sampling Time 4 readings per second
Memory Nonvolatile. Meter memorizes user configuration on power-down
Meter Enclosure ABS Plastic
Front Panel Lexan (Drip and Dust Proof; IEC IP55, NEMA Equivalent)
Power Supply 85 to 260VAC 50/60 Hz (automatic switching)
Power Consumption 6 Watts
Insulation Resistance >50M ohm
Noise Rejection Common Mode: 110 dB typical; Normal Mode: 50 db typical
Oper. Temp/Humidity 14 to 122oF (-10 to 50oC); 90% RH max.
Storage Temperature -4 to 140oF (-20 to 60oC)
Dimensions (Cutout) 3.58 x 3.58" ±0.02" (91.0 x 91.0mm ±0.5mm)

2.2 Input Specifications

Thermocouple inputs
(Programmable)

Types: J, K, T, E, B, R, S, N; Cold Junction Compensation;
Thermocouple Break Protection: Upscale, Downscale
Lead Wire Effect: 0.015%/ohm (Input impedance: 10 megohm)

RTD input Pt 100 ohm (DIN, JIS);

RTD Break Protection: Upscale, Downscale;
Lead Wire Effect: 0.015%/ohm
(automatically compensates if one lead wire is < 5Ω)

Current input

4-20mA DC (27Ω input resistance)
Voltage input 1-5V DC
Thermocouple Ranges

Type K -58 to 2498oF (-50 to 1370oC)
Type J -58 to 1830oF (-50 to 1000oC)
Type B 32 to 3272oF (0 to 1800oC)
Type T -454 to 752oF (-270 to 400oC)
Type E -58 to 1382oF (-50 to 750oC)
Type R 32 to 3182oF (0 to 1750oC)
Type S 32 to 3182oF (0 to 1750oC)

Type N -58 to 2372oF (-50 to 1300oC)
RTD PT100 input ranges -392 to 932oF (-200 to 500oC); DIN or JIS
Linear input range -1999 to 9999 display span (for 4-20mA, 1-5V, or special input)
Temperature Stability 5uV/oC typical
Repeatability 0.83oC (Thermocouple); 0.2oC (RTD); 1 digit (Linear)

2 96VTR Ver. 2.0 11/99

2.3 Output Specifications

Control Output Relay 1 & 2 5A @ 110VAC; 3A @ 220VAC; SPDT (Resistive Load)

Note: Relay 1 is called the Primary Output and Relay 2 the
Secondary in this manual

Optional Pulsed Outputs 24V DC (DC drive for SSR)

ON: 24V DC typical, 29V DC max.; OFF: 0.3V DC max

Optional Analog Control Output

4-20mA DC; Load limit: 600Ω impedance max.

Alarm/Timer Types High/Low Deviation and Absolute Alarms w/deadband

adjust and Soak/Event ON/OFF Timers

Alarm Output Relays 1 and 2 5A @ 110VAC; 3A @ 220VAC, SPST (Resistive Load)
Output Control Modes

Proportional Band 0.0 to 100.0% of Full Scale (Autotune)
Integral Time 0 to 3000 secs. (Autotune)
Derivative Time 0 to 3000 secs. (Autotune)
Cycle Time 1 to 100 secs. (0 sec for 4-20mA output)
Anti-Reset Wind-Up Inhibits integral action outside of the Proportional Band
Manual Reset 0 to 100% of Prop. Band
Hysteresis 0.0 to 25.5% of Full Scale

3. MOUNTING AND WIRING

3.1 Prepare a 3.58 x 3.58" ±0.02" (91.0 x 91.0mm ±

3.58" +0.02 "

0.5mm) panel cutout (refer to Fig.2). The panel
on which the controller will be mounted may be
up to 0.4" (10mm) thick.

3.2 Slide the meter into panel through the cutout.

3.3 Affix the mounting brackets to the top and
bottom of the meter and tighten the bracket

Cut-Out

Dimen sions

3.58"
+0.02"

screws. Do not tighten the screws excessively.

3.4 Connect the power cord to the meter but do not
connect to power source.

3.5 Connect sensor input and control/alarm outputs.

3.6 Connect power to source.

Wiring Notes:

AC: The AC supply terminals can

handle 85 to 260VAC 50/60Hz.

Control Output Relays: Terminals

14,15 and 16,17 (NO); Terminals
16,18 (NC).

Alarm Relays: Terminals 11, 12 and

12, 13 are N.O. when controller is
powered down AND when it's
powered-up in non-alarm condition.

2-Wire RTD Inputs: Connect RTD

across terminals 9 and 10. Short
terminals 8 and 9.

4-Wire RTD Inputs: Connect in the

same fashion as a 3-wire and leave
the 4th RTD wire open.

TX/RX+

TX/RX-

+24VDC

0V

RS-485 Connections

+

Thermocouple
and Analog
inputs

10 20

Figure 2

Screw Terminals

1

2

3

4

4-20
OUT

4-20
OUT

3-wire RTD
input

+

+

515

6

7

8

9

Alarm 1

11

SPST N.O.

12

Alarm 2
SPST N.O.

13

14

Output 2
Secondary N.O.

16

17

18

19

Output 1
Primary N.O. or N.C

AC

85 to 265VAC
50/60Hz

Figure 3

24VDC Pulse Output option: Use the

same terminals and polarity as 4-20mA outputs (shown in Figure 3).

Warning:

An independent redundant alarm should be used if control/alarm relay failure

could result in potential harm or damage.

3 96VTR Ver. 2.0 11/99

4. METER DESCRIPTION

1. Process Variable (PV) LED Display *

2. Setpoint Variable (SV) LED Display *

3. SCROLL key

4. UP and DOWN arrow keys

5. RETURN key

o

6.

C / oF Temperature unit indicators

7. Alarm, Control, Manual, Auto Tune status
indicators

* This display is also used for editing in the

programming mode

5. FRONT PANEL DESCRIPTION

5.1 PV (Process Variable) Display LEDs

Normal Operation

The top LED (red digits) displays the actual process measurement (temperature, voltage,
or current input signal). This is the "Process Variable" or PV.

Programming Mode

The red LEDs show the parameters for Programming Levels 1 through 4 (input type,
control action, etc.), one at a time. These parameters can be edited to suit the user's
requirements. Error messages are also displayed on these red LED Digits. Programming
details and error messages are explained later in this manual.

5.2 SV (Setpoint Variable) LED Digits

Normal Operation

During normal operation, the bottom LED (green) displays the user-programmable
Setpoint Variable (SV). This is the desired target to which the controller's output(s) will
adjust the process. To change the setpoint, use the up/down arrow keys. The setting
range equals the range the user selects in the LoLt (Low Limit) and HiLt (High Limit)
parameters during programming.

Programming Mode

The green LED display shows the actual data that can be edited for the parameter shown
on the red LED display. For example if the red LED is displaying Input Type, then the
green LED lists the input types in numerical order (for J, K, Analog, etc. types). The user
can then select the desired type. Refer to later sections for more on programming.

5.3 Status Indicators

'ALM 1' Status Indicator (Alarm Relay 1 Status LED)

This red LED is lit when the Alarm 1 relay is active. Also, this LED flashes when Alarm 1
is configured as an Event or Soak Timer and is in the process of counting down. Refer
to Appendix A and Section 11 for more on Alarm/Timer Functions.

'ALM 2' Status Indicator (Alarm Relay 2 Status LED)

This LED is lit in red when the Alarm 2 relay is active. Refer to Appendix A for more on
Alarm Functions.

'C1' Control Output 1 (Primary) Status Indicator

Illuminates in green when control output 1 is active.

'C2' Control Output 2 (Secondary) Status Indicator

Illuminates in green when control output 2 is active.

4 96VTR Ver. 2.0 11/99

'MA' Manual Mode Status LED

Illuminates when the controller is in Manual Mode of operation, which permits the user to
drive the control output manually. Refer to Section 10 for more details.

'AT' AUTO TUNE Status Indicator

When the controller is autotuning, this LED will blink. When the meter is finished tuning,
the LED will extinguish. Auto Tuning may take from several minutes to several hours
depending upon the process in question. Refer to Section 9.2 for more on Auto Tune.

'C' or ‘F’ Temperature Units Indicator for degrees C/F

LED Error Messages:
Err 1: A/D converter is inoperable. Unit must be repaired or replaced.
uuuu: Input under-range condition or input sensor not connected.
nnnn: Input over-range condition or input sensor not connected.
OPEN : Input sensor not connected or is inoperable.

5.4 Keypad Descriptions

SCROLL Key

While programming the controller you can move from one programmable parameter
to the next by pressing the Scroll key. The Scroll key is also used in combination with
the RETURN key to move between programming levels. The red LED display will
show each parameter title as you scroll through the list. Also, to activate an
autotuning session, press and hold this key for 5 seconds.

UP Arrow Key

Increases the Setpoint (SV) and increments parameter data when programming.

DOWN Arrow Key

Decreases the Setpoint (SV) and decrements parameter data when programming.

RETURN KEY

During normal operation, pressing the RETURN key permits the user to view the
controller's output action as a percentage (0.0 to 100.0% power). The lower (green)
display will indicate 'H' (heating outputs) followed by a percentage. After a few
seconds, the controller will automatically display a 'C' (cooling output). Press the
RETURN key from any mode to return to the normal SV display. The Return key
pressed with the SCROLL key moves from one programming level to the next.

Table I - Programming Level Parameters at a glance

1st Prog. Level 2nd Prog. Level 3rd Prog. Level 4th Prog. Level

rAmp Pb rEmo LoCA
oPoF CPb P-L HiCA
A1SP or timE ti A1Fu tunE
A2SP td A2Fu

db A1HY
A2HY
Act
unit

Notes: Symbols shown above

dp

are similar to the actual meter

Ct

LED displays which show

C Ct

parameters in mixed case. Some

HYST

parameters and even the 4

EroP

programming level can be locked

Addr

out depending upon the setting in

PVoF

P-L (Parameter Lock in 3

tYPe

programming level).

th

rd

LoLt
HiLt

5 96VTR Ver. 2.0 11/99