96VTR Datasheet, PDF (6/15 Pages) Extech Instruments Corporation. – 1/4 DIN Process Controller

6. FIRST PROGRAMMING LEVEL PARAMETERS
Press the SCROLL key to enter this level. Then use the SCROLL key to move through
the parameter list. To return to normal operation at any time, press RETURN key once.
Note: The configuration of the controller dictates which parameters appear. For
example, the 'ramp' parameter will not appear if ‘Parameter Lock’ (P-L) is set to '2'. Also,
A1SP will not appear if ‘A1Fu’ (Alarm 1 Function) is set to 8,9,10, or 11.
rAmp: Programmable rate of rise limit for PV. Permits the user to restrict the rate at
which the measured variable (PV) changes. Setting range: 0.0 to 100.0 units
per minute. Default = 0. The controller will monitor the changing PV and
override the controller output if necessary to limit the PV's rate of change.
oPoF: Output Offset. "Manual reset" function. The user can program a value (0.0 to
100.0%) which will then be added to the controller output percentage. For
example, if the oPoF parameter is set to 10.0%, the controller's output
percentage will always be 10% higher.
A1SP: Alarm 1 Setpoint value. First, set the desired Alarm type in the ‘A1Fu’ parameter
(refer to Appendix A for Alarm functions). Then program the desired limit here.
Allowable setting range is limited by parameter 'LoLt' and 'HiLt' (Low and High
Limit) settings.
timE: Programmable duration for the Event or Soak Alarm 1 Timer. The range is 0 to
9999 minutes. Refer to Section 11 and Appendix A for details on Soak/Event
Timers functions.
A2SP: Alarm 2 Setpoint value. First, set the desired Alarm type in the ‘A2Fu’ parameter
(refer to Appendix A for Alarm functions). Then program the desired limit here.
Allowable setting range is limited by parameter 'LoLt' and 'HiLt' (Low and High
Limit) settings.
7. SECOND PROGRAMMING LEVEL PARAMETERS
Press and hold the SCROLL and RETURN keys simultaneously to enter this level from
the previous programming level. To return to normal operation press the RETURN key.
NOTE: This is the Manual Tuning programming level. Rather than attempting a manual
tuning (manually setting values for the parameters in this level), it is strongly recommended
that AUTO TUNING be used to automatically set these parameters. If PID Tuning is
unfamiliar to you, manual tuning can cause severe process disturbances. Try Auto Tuning
first and then use Manual tuning afterward to fine tune the parameters if desired. For the
instructions on how to initiate an Auto Tune session, refer to Sec. 9.2.
Pb: Primary Output Proportional band value. Setting range from 0.0 to 100.0% of
controller's Span. Default = 10.0. Set Pb to 0.0% for ON/OFF control action.
This value is automatically calculated by activating the AUTOTUNE function
CPb: Secondary Output Proportional band value. Setting range from 0.0 to 100.0% of
controller's Span. Default = 10.0. Set CPb to 0.0% for ON/OFF control action.
ti: Integral (Reset) value. 0 to 3000 seconds setting range. Default = 240. This value is
automatically calculated by activating the AUTOTUNE function.
td: Derivative (Rate) Time. 0 to 3000 seconds setting range. Default = 40. This value is
automatically calculated by activating the AUTOTUNE function
db: 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.
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96VTR Ver. 2.0 11/99