Extech Instruments 48VTR Instruction Manual

99 Washington Street
Melrose, MA 02176

Phone [phone]
Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

Back to the Extech 48VTR Product Info Page

Instruction Manual

English / Español

Model 48VTR 1/16 DIN Process Controller

1. INTRODUCTION

The 48VTR 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 output), 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)
 Auto-Tuning automatically tailors the controller's response to a specific process
 Security lock-out
 Ramp-to-Setpoint and Soak functions
 Input selectability

2. SPECIFICATIONS

2.1 General Specifications

Display Dual 7-segment 4-digit LED Displays: Red (PV),

Green (SV)

Status Indicators For Control output, Alarm output, Over range, Auto-

Tune, and Open Input
LED display span -1999 to 9999 counts max (Programmable)
Indicating Accuracy +0.2% Full Scale +1 digit
Sampling Time 1 reading per 0.25 seconds
Memory Nonvolatile type
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

>50MΩ
Noise Rejection Common Mode: 110 db typical; Normal Mode: 50 db

typical
Operating Temperature / Humidity 14 to 122oF (-10 to 50oC); 90% RH max.
Storage Temperature -4 to 140oF (-20 to 60oC)
Dimensions (Cutout) 1.77 x 1.77" ±0.02" (45.0 x 45.0mm ±0.5mm)

2.2 Input Specifications

Thermocouple input
(Programmable)

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

RTD input Pt 100 ohm (DIN, JIS); RTD Break Protection: Upscale and

Downscale
Lead Wire Effect: 0.015/ohm
(automatically compensates if one lead wire is < 5 Ω)

Current input

4-20mA DC (2.7Ω input impedance)
Voltage input 1-5V DC
Thermocouple Ranges

Type K
Type J

Type B

Type T
Type E
Type R
Type S
Type N

-58 to 2498

-58 to 1830

32 to 3272

-454 to 752

-58 to 1382

32 to 3182

32 to 3182

-58 to 2372

o

F (-50 to 1370oC)

o

F (-50 to 1000oC)

o

F (0 to 1800oC)

o

F (-270 to 400oC)

o

F (-50 to 750oC)

o

F (0 to 1750oC)

o

F (0 to 1750oC)

o

F (-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 DC

input).
Temperature Stability 5uV/oC typical
Repeatability 0.83oC (Thermocouple); 0.2oC (RTD); 1 digit (Linear)

48VTR English 9/00 Ver. 2.7

1

2.3 Output Specifications

Control Output Relay 5 Amps @ 110V AC; SPDT (Resistive Load)
Control Output DC Voltage (Pulsed) 24V DC (DC drive for SSR)
ON: 24V DC typical, 29V DC max.
OFF: 0.3V DC max
Analog Control Output (Current)
Alarm/Timer Types High/Low Deviation/Absolute Alarms w/deadband

Alarm Output Relay 3 Amps @ 110VAC; SPST (Resistive Load)

Output Control Modes

Proportional Band 0.0 to 100.0% of Full Scale (can be Auto Tuned)

Integral Time 0 to 3000 secs. (can be Auto Tuned)

Derivative Time 0 to 3000 secs. (can be Auto Tuned)

Cycle Time 1 to 100 secs. (0 sec for 4-20mA output)

Anti-Reset Wind-Up Inhibits integral action outside of the Prop. 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 1.77x1.77" ±0.02" (45x45mm
± 0.5mm) panel cutout The panel on
which the controller will be mounted
may be up to 0.4" (10mm) thick.

3.2 Remove the plastic mounting bracket.
Slide meter into panel through the
cutout.

3.3 Replace the mounting bracket and then
tighten the bracket screws. Do not
tighten the mounting screws
excessively.

3.4 Connect the power cord to the meter
but do not connect to power source
(refer to wiring diagram below).

3.5 Connect sensor input and control/alarm outputs (Fig.3)

3.6 Connect power to source.

AC Power: The AC supply terminals can handle 85 to 260VAC 50/60Hz without having

to be physically switched or specially configured.

Control relay: Terminals 8-9 are Normally Open (NO) and Terminals 8-10 are

Normally Closed (NC) when the controller is powered down or when the controller is
powered on and the relay is not active. Relays themselves DO NOT supply AC power.
AC Power must be wired to Relay terminals.

Alarm relay: Terminals 4-5 are Normally Open (NO) when controller is powered down

AND when it's powered-up in a non-alarm condition. Relays themselves DO NOT
supply AC power. AC Power must be wired to Relay terminals.

Inputs: Terminal 1 is negative and terminal 2 is positive for TC and Analog inputs. 3-

wire RTD use terminals 1-2-3 as shown. 2-wire and 4-wire RTD can also be used,
refer to Figure 3.

48VTR English 9/00 Ver. 2.7

4-20mA DC; Load limit: 600Ω max.

adjust plus Soak/Event Timers

Wiring Notes

2

Warning: An independent redundant alarm should be used if control/alarm

relay failure could result in potential harm or damage.

AC

Control Output

4-20

6 7 8 + 9 - 10

+

1 2 3 4 5

TC

Analog

RTD

4. METER DESCRIPTION

1. Process Variable (PV) Display

2. Setpoint Variable (SV) Display

3. Control Output Status LED

4. Alarm Status LED

5. 'Return' Programming Key

6. Down Arrow Programming Key

7. Up Arrow Programming Key

8. 'Scroll' Programming Key

9. Auto Tune Decimal Indication

10. Mounting Bracket

11. Bracket Screw

5. FRONT PANEL DESCRIPTION

5.1 PV (Process Variable) Display LEDs

During normal operation, the top LED (red digits) displays the actual process
measurement (temperature, voltage, or current input signal). This process
measurement is known as the "Process Variable" or PV. In programming mode,
these red LEDs display the parameters from 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) Display LEDs

During normal operation, the bottom LED (green) displays the user-programmable
Setpoint Variable (SV). This represents the desired process equilibrium point to
which the controller's output will adjust the process. To adjust the setpoint, use the
up/down arrow keys. The allowable setting range equals the range the user selects
in LoLt (Low Limit) and HiLt (High Limit) parameters during programming. While
programming, this 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 (J, K, Linear, etc.).
The user can then select the desired type using the programming keys. Refer to
later sections for more on programming.

Alarm Output

2-wire RTD 4-wire RTD

1 2 3 1 2 3

Short terminals 1 and 2

Leave the 4th wire open

Figure 3

48VTR English 9/00 Ver. 2.7

3

5.3 Status Indicators

'ALM' Status Indicator (Alarm Relay Status LED)

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

'OUT' Status Indicator (Control Output Status LED)

Illuminates in green when the control output is active.

AUTO TUNE Status Indicator

When the controller is auto tuning, the rightmost decimal on the green LED
display will blink on/off. When the meter is finished tuning, the decimal will cease
blinking and disappear. Auto Tuning may take from several minutes to several
hours depending upon the process in question. See section 9.2 for details on
Auto Tune.

LED Error Messages:

Err 1: A/D converter is inoperable. Unit must be repaired or replaced.
uuuu: Over range condition with regard to input signal.
nnnn: Under range condition with regard to input signal.

- - - - : Input sensor not connected or is inoperable.

5.4 Keypad Descriptions

SCROLL Key

Press once to access the programming mode’s first level. In programming mode,
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 the SCROLL key for 5 seconds.

UP Arrow Key

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

DOWN Arrow Key

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

RETURN KEY

During normal operation, pressing the RETURN key permits the user to view the
controller output action as a percentage (0.0-100.0%). Press this key from any
other mode to return to the normal SV display. The RETURN key is also used
with the SCROLL key (pressed simultaneously) to move from one programming
level to another.

48VTR English 9/00 Ver. 2.7

4