IDEC MicroSmart Pentra - Manual (Page 147)

T ROUBLESHOOTING
9-6 FC5A MicroSmart PID Module User’s Manual FC9Y-B1283
Loop break alarm turns on even though the actuator operates normally.
Loop break alarm turns on
even though the actuator is
operating normally.
Is the loop break
alarm time too short? (*1)
Set the loop break alarm time to a
suitable value.
Is the loop break
alarm span too great? (*2)
Call IDEC for assistance. END
YES
NO
Set the loop break alarm span to a
suitable value.
NO
YES
*1: Loop break alarm time may be too short compared to the loop break alarm span.
*2: Loop break alarm span may be too great compared to the loop break alarm time.
Note: Loop break alarm time and loop break alarm span
Set the loop break alarm span to a value around 1.25 times bigger than the operation span in normal
operation.
Example: Heater in which temperature rises 150°C in 30 minutes
When the loop break alarm time is 10 minutes, the operation span in normal operation is 50°C
(150°C/30 minutes × 10 minutes). Set the loop break alarm span to 65°C which is about 1.25
times bigger than 50°C.
Program control is terminated earlier than the configured time.
Program control is terminated
earlier than the configured time.
Is PV start (*1) or
PVR start (*1) selected as “program
control mode start type“?
Select SP start (*1) as “program
control mode start type“.
Is each step time suitable?
Call IDEC for assistance. END
YES
NO
Set each step time to a suitable
value.
YES
NO
*1: For program control mode start type, see page 6-41.