YOKOGAWA UT750, Instruction Manual

Page: 82 / 108

5-14
<Toc> <5. Parameters>
IM 05D01B02-41E 1st Edition : May 31,2000-00
Ref.4.1(2)
Ref.4.1(1)
Ref.4.1(2)
Parameter
Symbol
Name of Parameter Setting Range and Description Initial Value User
Setting
Target Item
in CD-ROM
Time
Maximum value of
PV input range
RH1
Reference point 2
2.RP
Minimum value of
PV input range
RL1
Reference point 1
1.RP
Zone 3
The controller is operated with
the 3rd group of PID constants.
Zone 2
The controller is operated with
the 2nd group of PID constants.
Zone 1
The controller is operated with
the 1st group of PID constants.
PV input
value
Setpoint
OFF (0): Disable
0.0% to 100.0% of PV input range span
Reference deviation (RDV)
Maximum value of
PV input range
Minimum value of
PV input range
Target setpoint
PV input value
Reference deviation (RDV)
[1]
[2]
[2]
[1]
[1]
[2]
A slope is set to vary
the target setpoint.
Zone PID selection 0: SP selection
1: Zone PID
If set to “SP selection,” allows PID constants to be selected for each
target setpoint.
If set to “Zone PID,” automatically selects PID constants according
to the temperature range set in the given Reference Point parameter. 0
Restart mode
Restart timer
CONT (0): Continues action set before power failure.
MAN (1): Starts from manual operation status
AUTO (2): Continues action set before power failure in automatic operation.
Allows you to determine how the controller should recover from a power
failure of longer than 2 sec. CONT (0)
0 to 10 sec.
Sets time between power on and the instant where controller starts
computation. 0 sec.
PID group number Allows you to determine how many groups of setpoint, alarm and
PID parameters the controller should show.
1: Show one set. 2: Show two sets.
3: Show three sets. 4: Show four sets.
5 to 8: Show as many groups of parameters as have been set.
8
Zone PID reference
point-1
Zone PID reference
point-2
Zone PID reference
point-3
Zone PID reference
point-4
Zone PID reference
point-5
Zone PID reference
point-6
0.0 to 100.0% of PV input range.
Note that 1.RP
2.RP 3.RP 4.RP 5.RP 6.RP.
Sets reference points at which switching is carried out between groups
of PID constants according to the given temperature zone. You can set
a maximum of six reference points and therefore a maximum of seven
temperature zones. To enable this parameter, set the Zone PID
Selection (ZON) parameter to “1”.
The example below sets reference points 1 and 2 to provide 3 zones to
switch PID constants automatically.
100.0% of
PV input
range
Zone switching
hysteresis 0.0 to10.0% of PV input range span
Allows hysteresis to be set for switching at a reference point. 0.5% of PV
input range
span
Reference deviation Used to select a group of PID parameters according to a deviation from
the given target setpoint. The controller uses the parameter of the number
selected in PID group number (GRP) if the PV input falls outside the given
deviation range.
The following example shows a case when only the reference deviation
is set without setting any reference point. The selected set of PID
parameters is as follows.
Since region 1 is within the deviation range, the controller uses 1st
group of PID parameters.
Since region 2 is outside the deviation range, the controller uses
the parameter of the number selected in PID group number (GRP) OFF (0)
ZON
R.MD
R.TM
GRP
1.RP
2.RP
3.RP
4.RP
5.RP
6.RP
RHY
RDV
RH1
RL1