YOKOGAWA UT350, Instruction Manual

Page: 62 / 82

5-6
<Toc> <5. Parameters>
IM 05D01D02-41E 1st Edition : May 31,2000-00
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PID-related Parameters
The following parameters are displayed when “1Gr” is set to PID parameter display number
(PID).
In this case, the corresponding target setpoint is 1.SP (target setpoint-1).
To set PID corresponding to target setpoint 2 to 4, set “2Gr”, “3Gr”, or “4Gr” to PID. The
relevant parameters will then be displayed.
Proportional band/Heating-
side proportional band
(in heating/cooling control) 0.1 to 999.9%
In heating/cooling control: 0.0 to 999.9%
(heating-side ON/OFF control applies when 0.0) 5.0%
Integral time
Heating-side integral time
(in heating/cooling control) OFF (0), 1 to 6000 sec.
OFF (0), 1 to 6000 sec.
240 sec.
60 sec. Derivative time
Heating-side derivative time
(in heating/cooling control)
Manual reset -5.0 to 105.0%
(enabled when integral time “1.I” is OFF)
The manual reset value equals the output value
when PV = SP is true.
For example, if the manual reset value is 50%,
the output value is 50% when PV = SP
becomes true. 50.0%
(1.P)
(1.I)
(1.D)
(1.MR)
Parameter
Symbol
Name of Parameter Setting Range and Description Initial Value User Setting
Target Item
in CD-ROM
Cooling-side integral
time OFF (0), 1 to 6000 sec. 240 sec.
60 sec. OFF (0), 1 to 6000 sec. Cooling-side derivative
time
Deadband -100.0 to 50.0%
In heating/cooling control, setting any positive
value prohibits both the heating and cooling
outputs from turning on; setting any negative
value allows both the heating and cooling
outputs to turn on; and setting a value of zero
either the heating or cooling output to turn on. 3.0%
(1.Ic)
(1.Dc)
(1.DB)
Zone PID reference
point-1 100% value of
PV input range
(1.RP)
0.0 to 100.0% of PV input range.
Note that 1.RP
ⱕ
2.RP.
Cooling-side
proportional band 0.0 to 999.9%
(Cooling-side ON/OFF control applies when
0.0) 5.0%
(1.Pc)
Ref.4.1(1)
Refer to the table below for recording setpoints when two sets or more of PID parameters
are used.
Parameter n=2 n=3 n=4
n.P
n.I
n.D
n.MR
n.Pc
n.Ic
n.Dc
n.DB
None None
n.RP
Reference deviation OFF (0), 0.0 to100.0% of PV input range span
Used to select PID constants according to a deviation from
the setpoint. The 4th group of PID constants is used
when the controller fails to keep track of the deviation. OFF (0)
(RDV)
Ref.4.1(1)