Honeywell UDC 2300, Product Manual

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Function Parameter Reference Guide
144 UDC2300 Controller Product Manual 12/00
12.2.64 PB or GAIN
(PROPORTIONAL BAND or GAIN)
This prompt is part of the Tuning Set up group.
PROPORTIONAL BAND is the percent of the range of the measured variable for which
a proportional controller will produce a 100 % change in its output.
GAIN is the ratio of output change (%) over the measured variable change (%) that
caused it.
G =
100 %
PB %
where PB is the proportional band (in %)
If the PB is 20 %, then the Gain is 5. Likewise, a 3 % change in the error signal (SP-PV)
will result in a 15 % change in the controller’s output due to proportional action. If the
gain is 2, then the PB is 50 %.
Defined as “HEAT” Gain on Duplex models for variations of Heat/Cool applications.
The selection of Prop. Band or Gain is made in the Control parameter group under
prompt “PB or GN.”
Range of Setting:
PB = 0.1 to 1000 %
GAIN = 0.01 to 1000
12.2.65 PB 2 or GAIN 2
(PROPORTIONAL BAND 2 or GAIN 2)
This prompt is part of the Tuning Set up group.
PROPORTIONAL BAND 2 is the percent of the range of the measured variable for
which a proportional controller will produce a 100 % change in its output.
GAIN 2 is the ratio of output change (%) over the measured variable change (%) that
caused it.
G =
100 %
PB %
where PB is the proportional band (in %)
If the PB is 20 %, then the Gain is 5. Likewise, a 3 % change in the error signal (SP-PV)
will result in a 15 % change in the controller’s output due to proportional action. If the
gain is 2, then the PB is 50 %.
Defined as “COOL” Gain on Duplex models for variations of Heat/Cool applications or
for a Second Set of PID constants.
The selection of Prop. Band or Gain is made in the Control parameter group under
prompt “PB or GN.”
Range of Setting: PB 2 = 0.1 to 1000 %
GAIN 2 = 0.01 to 1000