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

Extech Instruments 48VTR User Manual

Digital process controller
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User's Guide
Digital Process Controller
Model 48VTR
OUT
- PV -
1
00
- SV -
ALM
VTR

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Summary of Contents for Extech Instruments 48VTR

  • Page 1 User's Guide Digital Process Controller Model 48VTR - PV - - SV -...

  • Page 2: Warranty

    Warranty EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment (a six month limited warranty applies to sensors and cables). If it should become necessary to return the instrument for service during or beyond the warranty period, contact the Customer Service Department at (781) 890-7440 ext.

  • Page 3: Table Of Contents

    Control Output Descriptions Display Descriptions . Keypad Descriptions . Programming Menu Levels Calibration Automatic Tuning Auto / Manual Control Ramp-to-Setpoint Limit Soak and Event Timers Appendix A: Alarm Functions . Appendix B: Application example Model 48VTR - Version 5.0 – January 2006...

  • Page 4: 48Vtr Overview

    (when the display shows ‘8888’). Locking Out the Controller To lock out the controller, in order to avoid setpoint and program tampering, refer to the ‘REMO’ and ‘PARAMETER LOCK’ (PL) parameters in the 3 Programming Level. Model 48VTR - Version 5.0 – January 2006...

  • Page 5: Specifications

    -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 Model 48VTR - Version 5.0 – January 2006...
  • Page 6 Alarm relay can also be used with the controller’s Soak/Event Timer functions. ANALOG Output Specifications Analog output 4-20mA DC Load limit 600Ω max. Programming Set Cycle Time (Ct) to ‘0’ to enable the analog output Model 48VTR - Version 5.0 – January 2006...

  • Page 7: Front Panel Description

    0.4" (10mm) thick. Remove the plastic mounting bracket and slide the meter into panel through the cutout. Replace the mounting bracket and then tighten the bracket screws. Do not tighten the mounting screws excessively. Model 48VTR - Version 5.0 – January 2006...

  • Page 8: Wiring

    RTD Input (2, 3, or 4 wire) RTD inputs use terminals 1, 2, & 3. Select a scheme from one of the diagrams below. Jumper 3-wire RTD Input 2-wire RTD Input 4-wire RTD Input RTD Input Wiring Model 48VTR - Version 5.0 – January 2006...
  • Page 9 NOT supply power, power must be supplied; wire the relay as shown in the diagram. Alarm Device External i.e., buzzer, indicator, Power siren, cut-off switch, Source etc. Alarm Output Wiring Normally Open (N.O.) Relay contacts Model 48VTR - Version 5.0 – January 2006...

  • Page 10: Control Output Descriptions

    10-second CYCLE TIME (Ct) for a 10-second CYCLE TIME (Ct) RELAY OFF TIME (in seconds) 10% Output = ON 1 seconds; OFF 9 seconds for a 10-second CYCLE TIME (Ct) DIAGRAM 3 Model 48VTR - Version 5.0 – January 2006...
  • Page 11 Menu Level) must be set to ‘0’. Controller Output% vs. Proportional Band (Pb) Setting The 48VTR output percentage is largely determined by the proximity of the PV (Measured variable) to the SV (Setpoint). However, the Proportional Band and the High/Low Limit settings also have an effect on the Controller Output.
  • Page 12 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. 100% Output Region TIME Proportional Band (Pb) set correctly Model 48VTR - Version 5.0 – January 2006...

  • Page 13: Display Descriptions

    PV Display Error Messages: AdEr: A/D converter is inoperable. Unit must be repaired or replaced. Flashing PV: Over range condition with regard to input signal. OPEN: Input sensor not connected or is inoperable. Model 48VTR - Version 5.0 – January 2006...

  • Page 14: Keypad Descriptions

    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 menu to another. Model 48VTR - Version 5.0 – January 2006...

  • Page 15: Programming Menu Levels

    Programming Menu Levels The 48VTR has four (4) Menu Levels used for programming. The Menu Levels are shown in the Table below. Each parameter is described in detail in the following sections. Menu Levels and Parameters 1st Menu Level 2nd Menu Level...
  • Page 16 Integral (Reset). 0 to 3000 seconds setting range. Default = 240. This value is automatically calculated by activating the AUTO TUNE function. Derivative (Rate). 0 to 3000 seconds setting range. Default = 40. This value is automatically calculated by activating the AUTO TUNE function. Model 48VTR - Version 5.0 – January 2006...
  • Page 17 The rEmo (remote control) parameter, intended for use on the 96VTR, can be used by the 48VTR to lock out all of parameters. Set to ‘1’ to lock out the entire controller. Set to ‘0’ for full access. Parameter Lock. This security feature locks out selected programming levels or single parameters thereby prohibiting tampering and inadvertent changes.
  • Page 18 2 difference by programming a "-2" value for this parameter. Overall range of the setting is -180 to +180. The default value is '0'. Model 48VTR - Version 5.0 – January 2006...
  • Page 19 High limit (of Span). Refer to SPAN paragraph below. A Note about SPAN SPAN is an important 48VTR parameter and is found by subtracting the Low Limit (LoLt) from the High Limit (HiLt) parameters. The size of the SPAN affects the size of the Proportional Band (‘Pb’) in the 2...

  • Page 20: Calibration

    10. If the controller does not indicate the expected display values, re-calibrate the instrument. If the display still does not function correctly, contact Extech Instruments for technical support or return the instrument for repair or replacement. Model 48VTR - Version 5.0 – January 2006...

  • Page 21: Automatic Tuning

    EVERY time the controller is powered up the auto tune begins if the PV < SV EVERY time the controller is powered up the auto begins automatically if the PV = SV Model 48VTR - Version 5.0 – January 2006...

  • Page 22: Auto / Manual Control

    ‘rAmP’ limit in the 1 Menu Level. Note that the ‘rAmP’ parameter will not appear in the 1 Menu Level if “Parameter Lock” (P-L) is set to ‘0’ or an even number. Model 48VTR - Version 5.0 – January 2006...

  • Page 23: Soak And Event Timers

    Event Timer Example Example process description: An oven is controlled by a 48VTR to maintain a temperature for 4 hours. An ‘Event’ is to take place 2 hours into the process. The Event, in this example, is the controller's alarm relay activating a pump.

  • Page 24: Appendix A: Alarm Functions

    ALARM RELAY 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 Model 48VTR - Version 5.0 – January 2006...

  • Page 25: Appendix B: Application Example

    Note: Wiring shown assumes that the AC source is powering both the meter and the Heater/ Alarm. If the external devices require a different AC source or a require a DC source, the wiring will differ. Model 48VTR - Version 5.0 – January 2006...

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