Display
Name & Description
Range
Display
condition
Default
value
Set 2 Mode
*
Set 2 Type
Not for Heat-
cool mode.
Set2 mode =
Fd / rEV.
5. LEVEL 2 - AUXILIARY OUTPUT MODES
There are 3 selectable modes for programming cycle time:
AutO: This is recommended. The cycle time value is calculated automatically during
autotune.
1. AutO: The value will be calculated automatically during autotune (Recommended).
Auto tuning is a function whereby the controller learns the process characteristics by itself
and automatically sets the required P,I and D values. The new P,I,D parameters will be
stored in non-volatile memory automatically. TUNE ON is indicated by ‘T’ LED blinking.
(For detailed explanations of PID parameters refer USER GUIDE).
!
TIMER:
Usr.F: User can fix the cycle time. This has the highest priority.
These parameters are used to limit the minimum and maximum controller output power.
The output power lower limit will ensure that a minimum percentage of output (as per
requirement) is available in case any process disturbances or setpoint changes occur.
The output power high limit ensures that in case any process disturbance or set point
changes occur, the maximum value of output is limited to a value as per requirement.
!
CYCLE TIME:
!
OUTPUT POWER LIMITS:
USEr: User can program the cycle time. The mode will be altered to AutO when put to
autotune.
!
ANTIRESET WINDUP:
!
AUTO TUNING:
2. ManL: The value can be fed manually by the user.
PARAMETER EXPLANATIONS :
TIMER is main output restart time. In this main output once turned OFF will turn ON only
after set time even if the temperature has increased and is more than the set temperature.
This is needed to prevent the compressor from restarting in a short time (less than the set
time).
The anti-reset windup (ARW) inhibits the integral action until the PV is within the
proportional band thus reducing overshoot on start-up. If the selection is -
Set 2 Value
Proportional band-Cool
Not prompted
if Set2 mode =
alarm & alarm
mode = S. Brk.
Heat-cool mode
Cycle time-Cool
Pb-C>0
21
NOTE: * - If set2 mode = none, no other parameters will be prompted.
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to
to
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to
Sec.
Programming.
