IDEC FC5A-F2M2 User Manual page 115

C PID M
ONFIGURING ODULE USING
(8) Control Register+187: Output Manipulated Variable Rate-of-Change
The maximum change of the output manipulated variable in 1 minute can be configured. This function is
disabled when the value is 0.
In the case of heating control, when there is a large deviation between the process variable (PV) and the set
point (SP), the output immediately changes from off to on as shown in the diagram below (Normal Output). By
configuring the output manipulated variable rate-of-change, the maximum change of the output manipulated
variable (MV) in 1 minute can be changed as shown in the diagram below (Output When Output Manipulated
Variable Rate-of-Change is Configured).
This function can be used for a high temperature heater (used at approximately 1500 to 1800°C) which has to
be heated gradually, as the heater can be burnt out if the power is supplied rapidly.
Normal Output
ON
OFF
(9) Control Register+188: Alarm 1 Value
(10) Control Register+189: Alarm 2 Value
(11) Control Register+190: Alarm 3 Value
(12) Control Register+191: Alarm 4 Value
(13) Control Register+192: Alarm 5 Value
(14) Control Register+193: Alarm 6 Value
(15) Control Register+194: Alarm 7 Value
(16) Control Register+195: Alarm 8 Value
There are two types of alarms: Deviation alarm and process alarm.
Alarm Type
Upper/Lower limit range alarm
Upper limit alarm,
Deviation Lower limit alarm,
Alarm
Upper/Lower limits alarm,
Upper limit alarm with standby,
Lower limit alarm with standby,
Upper/Lower limits alarm with
standby
Process
Process high alarm
Alarm Process low alarm
When the alarm value is 0, the alarm action is disabled except process high alarm and process low alarm.
(17) Control Register+197: Output Manipulated Variable Upper Limit
This value specifies the upper limit of the output manipulated variable (MV). The output manipulated variable
upper limit is used to suppress the output manipulated variable (MV).
Example:
When the output manipulated variable (MV) upper limit is 80%, the control output will be 80% even when the
output manipulated variable (MV) reaches 100%.
(18) Control Register+19: Output Manipulated Variable Lower Limit
This value specifies the lower limit of the output manipulated variable (MV).
Example:
When the output manipulated variable (MV) lower limit is 20%, the control output will be 20% even when the
output manipulated variable (MV) is 0%.
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IND
Output When Output Manipulated Variable Rate-of-Change is Configured
100%/sec 20%/sec
1 second 5 seconds
Alarm Value
Deviation from the set
point (SP) is the alarm
value.
The alarm action point is
the alarm value.
FC5A MicroSmart PID Module User's Manual FC9Y-B1283
10%/sec
10 seconds
Alarm Action
The alarm output turns off if
the process variable (PV)
exceeds the range.
The alarm output turns on if
the process variable (PV)
exceeds the range.
The alarm output turns on if
the process variable (PV)
exceeds the alarm value.