Honeywell DR4500A - Page 115

Configuration Parameter Definitions
Tuning Parameters Set Up Group
Release M DR4500A Classic Series Circular Chart Recorder With or Without Control Product Manual 101
April 2017
Lower Display
Prompt
Upper Display
Range of Setting or Selection
Parameter Definition
PROP BD
or
GAIN
0.1 to 1000%
or
0.1 to 1000
PROPORTIONAL BAND is the percent of the range of
the measured variable for which a proportional recorder
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 recorder's output due to proportional
action. If the gain is 2, then the PB is 50%.
 Used with control algorithm PID-A or PID-B.
Defined as "HEAT" Gain on Duplex models for
variations of Heat/Cool applications.
 The selection of Proportional Band or Gain is made in
the control parameter group under prompt
"PBorGAIN."
RATE MIN
0.08 to 10.00 minutes
0.08 or less = OFF
RATE action affects the recorder's output whenever the
deviation is changing; and affects it more when the
deviation is changing faster.
 Used with control algorithm PID-A or PID-B.
Defined as "HEAT" Rate on Duplex models for
variations of Heat/Cool applications.
RSET MIN
or
RSET RPM
0.02 to 50.00
RSET MIN = RESET IN MINUTES / REPEAT
RSET RPM = RESET IN REPEATS / MINUTE
RESET adjusts the recorder's output in accordance with
both the size of the deviation (SP-PV) and the time it
lasts. The amount of the corrective action depends on
the value of Gain. The Reset adjustment is measured as
how many times proportional action is repeated/minute.
 Used with control algorithm PID-A or PID-B.
Defined as "HEAT" Reset on Duplex models for
variations of Heat/Cool applications.
 The selection of minutes per repeat or repeats per
minute is made in the control parameters group under
prompt "MINorRPM."
MAN RSET
–100 to +100
(in % output)
MANUAL RESET is only applicable if you have control
algorithm PD WITH MANUAL RESET. Because a
proportional recorder will not necessarily line out at
setpoint, there will be a deviation (offset) from setpoint.
This eliminates the offset and lets the PV line out at
setpoint.