96VTR Datasheet, PDF (4/15 Pages) Extech Instruments Corporation. – 1/4 DIN Process Controller

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
6. ^oC / ^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.
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96VTR Ver. 2.0 11/99