Extech Instruments 48VTR User Manual
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Extech Instruments 48VTR User Manual

Extech Instruments 48VTR User Manual

Digital process pid controller
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USER MANUAL
Digital Process PID Controller
Model 48VTR

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Summary of Contents for Extech Instruments 48VTR

  • Page 1 USER MANUAL Digital Process PID Controller Model 48VTR...

  • Page 2: Table Of Contents

    Soak and Event Timers ....................19 Appendix A: Alarm and Timer Functions ..............21 Appendix B: Heating Application Example ..............23 Calibration........................24 Specifications ....................... 25 Two-year Warranty ...................... 28 Calibration and Repair Services..................28 Contact Customer Support ................... 28 48VTR User Manual v6.0 10/1/20...

  • Page 3: Introduction

    Wiring section. Process Inputs The 48VTR can be ordered in a variety of input configurations. For temperature versions, the controller accepts a thermocouple or RTD thermometer. For analog versions, the controller accepts a 4 to 20mA process signal.

  • Page 4: Mounting

    Terminals 6 and 7 can safely accept 90 to 264VAC 50/60Hz. Thermocouple Input Terminal 1 (-) and terminal 2 (+). Analog Input (4-20mA) Terminal 1 (-) and terminal 2 (+). RTD Input (2, 3, or 4 wire) Refer to the diagrams below. 48VTR User Manual v6.0 10/1/20...
  • Page 5 Program Menu) must be set to ‘0’ when using an analog output. Alarm Relay Output The Alarm Relay is a normally open (N.O.) switch available at terminals 4 and 5. Power must be supplied as shown below. 48VTR User Manual v6.0 10/1/20...

  • Page 6: Front Panel Description

    • Press and hold for 5 seconds to activate Manual Control (see the Automatic and Manual Control section). • Press key from any other mode to return to the normal SV display. • Hold the Return and Scroll keys for 5 seconds to jump to another programming menu level. 48VTR User Manual v6.0 10/1/20...

  • Page 7: Display Descriptions

    The decimal will stop flashing when Auto Tune is finished. PV Display Error Messages: AdEr: A/D converter problem. Unit must be repaired or replaced. Flashing PV: Measured input exceeds the limits of the controller. OPEN: No sensor connected or sensor inoperable. 48VTR User Manual v6.0 10/1/20...

  • Page 8: Process Control Preparation

    ON-OFF is the simplest form of control, where the controller output is OFF at setpoint and ON away from setpoint. To use ON-OFF control, set ‘Pb’ (2 Menu) to ‘0’. Use the Hysteresis setting (‘Hyst’ in the 3 Menu) to create a ‘dead band’ around the setpoint to minimize relay chatter. 48VTR User Manual v6.0 10/1/20...
  • Page 9 Diagram 3: The PV is very close to SV, so the output is at 10% power. The controller must be tuned, and the Cycle Time set accurately, before Time Proportioning can be effective. See the Auto Tune section for tuning details. Cycle Time should be set to 48VTR User Manual v6.0 10/1/20...
  • Page 10 Whenever possible, use the Auto Tune to automatically set the Pb. You can make manual adjustments if necessary. Proportional Band examples are illustrated below. Pb setting too narrow When a Proportional Band is set too narrow, the PV rises too quickly and typically overshoots the SV as shown. 48VTR User Manual v6.0 10/1/20...
  • Page 11 When the Proportional Band is set correctly, the PV rises to the SV in a reasonable amount of time with little undershoot. A slight oscillation of the PV (within specification) is typical once the SV is reached. 48VTR User Manual v6.0 10/1/20...

  • Page 12: First Programming Menu Level

    Alarm Setpoint. First set the Alarm type using the ‘A1Fu’ parameter; refer to the Appendices for a list of Alarm functions. Allowable setting range for ‘A1SP’ is limited by the Low and High Limit settings (3 Menu Level) and the input type selected. To 48VTR User Manual v6.0 10/1/20...

  • Page 13: Second Programming Menu Level

    Derivative (Rate). 0 to 3000 seconds setting range. Default = 40. This tuning parameter is automatically set by Auto Tune. The lower the setting, the more often the controller adjusts the output based on the rate of PV change. 48VTR User Manual v6.0 10/1/20...

  • Page 14: Third Programming Menu Level

    The Remote-Control parameter, intended for use on the 96VTR model, can be used by the 48VTR to lock out all parameters. Set to ‘1’ to lock out the entire controller. Set to ‘0’ for full access. Parameter Lock. Set this security feature to lock entire programming levels or individual parameters.
  • Page 15 The setting must ‘0’ when the option is not installed. PVoF PV Display Offset. Set a +/- value to offset the value on the PV display. tyPE Sensor Input Selection. See table below. 48VTR User Manual v6.0 10/1/20...

  • Page 16: Fourth Programming Menu Level

    Auto Tuning ‘initialization mode’. This parameter allows you to determine the conditions whereby an Auto Tune can be initiated. Auto Tune can automatically start under certain conditions. Set this parameter per the Table in the Auto Tuning section. 48VTR User Manual v6.0 10/1/20...

  • Page 17: Automatic Tuning

    Auto Tunes automatically when the controller is FIRST powered up if the PV = SV EVERY time the controller is powered up the auto tune begins if the PV < SV EVERY time the controller is powered up the tuning begins automatically if the PV = SV 48VTR User Manual v6.0 10/1/20...

  • Page 18: Automatic And Manual Control Modes

    A setting of ‘0.0’ disables the feature. Note that the ‘rAmP’ parameter will not appear in the 1 Menu if the Parameter Lock ‘P-L’ is set to ‘0’ or an even number. 48VTR User Manual v6.0 10/1/20...

  • Page 19: Soak And Event Timers

    8 and 9, and the AC power on 6 and 7. In this example, the Alarm relay switches power to the Control relay ON and OFF allowing the Soak timer to control the process unhindered for the programmed Soak time. 48VTR User Manual v6.0 10/1/20...
  • Page 20 Alarm relay ON yet. The Alarm relay switches OFF only after the time elapses. Event Timer Example In this example, the 48VTR is controlling oven temperature. The process runs in 4-hour cycles and an ‘event’ is scheduled two hours into the process. At the 2-hour point, the Alarm relay activates a pump to allow a liquid into the oven.

  • Page 21: Appendix A: Alarm And Timer Functions

    Upon power-up the alarm is de-energized. When the PV = SV the timer starts but the alarm relay remains de-energized. When the timer counts down to zero, the relay energizes. Set the timer using the ‘time’ parameter in the 1 Menu Level. See Table below. 48VTR User Manual v6.0 10/1/20...
  • Page 22 Relay after Timer Setting Timer Mode at Power-up (Timer Starts counting) Counts Down EVENT ON-TIMER EVENT OFF-TIMER SOAK ON-TIMER SOAK OFF-TIMER EVENT and SOAK Timer Relay States ON = Alarm Relay energized OFF = Alarm Relay de-energized 48VTR User Manual v6.0 10/1/20...

  • Page 23: Appendix B: Heating Application Example

    A1SP (Alarm Setpoint) in 1st Menu Level Set the alarm setpoint to 600 F to prepare the over-temp alert. Tuning the Controller (2nd Menu Level) Run an Auto Tune session per the Auto Tune section instructions. 48VTR User Manual v6.0 10/1/20...

  • Page 24: Calibration

    20mA example above) and verify that the display indicates a value midway between the high display and the low display values (75, for the 4-20mA example above). 10. If the controller does not indicate the expected display values, re-calibrate the instrument. For questions, contact Extech support. 48VTR User Manual v6.0 10/1/20...

  • Page 25: Specifications

    Type E: -58 to 1382 F (-50 to 750 Type R: 32 to 3182 F (0 to 1750 Type S: 32 to 3182 F (0 to 1750 Type N: -58 to 2372 F (-50 to 1300 48VTR User Manual v6.0 10/1/20...
  • Page 26 Alarm relay output SPST, dry contact relay Rated for 3 Amps @ 110VAC; (Resistive Loads) Alarm modes Deviation and Absolute Alarms with dead band adjustment Alarm relay can also be used as a Soak or Event Timer 48VTR User Manual v6.0 10/1/20...
  • Page 27 ANALOG Output Specifications Analog output 4-20mA DC Load limit 600 ohms max. Programming Set Cycle Time (Ct) to ‘0’ to enable the analog output 48VTR User Manual v6.0 10/1/20...

  • Page 28: Two-Year Warranty

    Wiring diagram of the process, including the controller • User Manual • Controller error messages (if any) Copyright © 2020 FLIR Systems, Inc. All rights reserved including the right of reproduction in whole or in part in any form www.extech.com 48VTR User Manual v6.0 10/1/20...

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