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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 Three-
Mode 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
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Model 96VTR
¼ DIN Process Controller
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
INSTRUCTION MANUAL
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Table of Contents
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Summary of Contents for Extech Instruments 96VTR
- Page 1 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 Three-...
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Page 2: Specifications
F (-200 to 500 C); DIN or JIS Linear input range -1999 to 9999 display span (for 4-20mA, 1-5V, or special input) Temperature Stability 5uV/ C typical Repeatability 0.83 C (Thermocouple); 0.2 C (RTD); 1 digit (Linear) 96VTR Ver. 2.0 11/99... -
Page 3: Mounting And Wiring
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. 96VTR Ver. 2.0 11/99... -
Page 4: Meter Description
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. 96VTR Ver. 2.0 11/99... - Page 5 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). LoLt HiLt 96VTR Ver. 2.0 11/99...
- Page 6 Deadband: Setting range: -10.0% to +10.0% of Pb. Permits the user to set up a "neutral" zone within the proportional band (around the main control setpoint) where outputs 1 (Pri.) and 2 (Sec.) will not change state at the same time. Refer to Appendix C for in-depth details on db. 96VTR Ver. 2.0 11/99...
- Page 7 Set to '03' for 0.001 resolution (cannot use this setting for temperature inputs) Ct: Primary Control Output 1 Cycle Time. Range: 0 to 100 seconds. This is the rate at which the controller makes automatic output adjustments. The longer the time, 96VTR Ver. 2.0 11/99...
- Page 8 OUT 2 ALM 2 ALM 1 OUT 1 Set OUT 2 ALM 2 ALM 1 OUT 1 Addr: Controller address used with the RS-485 communications option so that a PC can recognize a specific 96VTR controller from among a group of 96VTRs or other connected interface devices. Setting range is "0" to "31". Default = 0.
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Page 9: Auto Tuning
Auto Tune session will automatically begin from Table III below. The controller defaults to Setting = ‘0’ (user initiates an Auto Tune session). To manually initiate an Auto Tune session follow the procedure in Section 9.2.2. 96VTR Ver. 2.0 11/99... -
Page 10: Automatic Control
0.0 through 100.0% (for testing purposes). To use this feature you first have to unlock it. Press and hold the DOWN and RETURN keys until the display flashes. Press and hold the RETURN key for 5 seconds to access the Manual Mode. 96VTR Ver. 2.0 11/99... - Page 11 UP and RETURN keys until the display flashes. While locked, the Manual Mode is inaccessible. 11. RAMP-TO-SETPOINT AND EVENT/SOAK TIMER FUNCTIONS The Extech 96VTR controller operates as a fixed setpoint controller. However, the controller offers several advanced features which can enhance your application. These include Ramp-to-Setpoint and Event/Soak Alarm/Timers.
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Page 12: Customer Service
14. WARRANTY EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment (a limited warranty may apply on 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 for authorization. - Page 13 Table IV - EVENT and SOAK Timer Relay States A1Fu Controller When PV=SV After Timer Setting ALARM RELAY MODE at Power-up Timer Starts Counts Down EVENT ON-TIMER EVENT OFF-TIMER SOAK ON-TIMER SOAK OFF-TIMER ON = Alarm Relay energized OFF = Alarm Relay de-energized 96VTR Ver. 2.0 11/99...
- Page 14 Run the Auto Tune utility per section 9.2 in this manual. Running Auto Tune supersedes programming Level 2 parameters. Calibration (Level 4 parameters) Calibration is very rarely required. If calibration must be performed refer to Section 9.1 for details or contact Extech. 96VTR Ver. 2.0 11/99...
- Page 15 ON at the same time (notice the deadband region in Fig. 6a). Fig. 6b illustrates a negative deadband value which permits the primary and secondary outputs' proportional bands to overlap causing the two outputs to potentially be ON at the same time. 96VTR Ver. 2.0 11/99...
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