IDEC MicroSmart Pentra - Manual (Page 144)

T ROUBLESHOOTING
FC5A MicroSmart PID Module User’s Manual FC9Y-B1283 8-3
Hunting phenomenon is occurring while in ON/OFF control action
Hunting phenomenon is
occurring while in ON/OFF
control action.
Is the output ON/OFF
hysteresis (*1) too narrow ?
Set the output ON/OFF hysteresis
to a suitable value.
Call IDEC for assistance. END
YES
NO
*1: For detail about the output ON/OFF hysteresis, see page 6-38.
Hunting phenomenon is occurring while in PID, PI, PD, or P control action
Hunting phenomenon is
occurring while in PID, PI, PD,
or P control action.
Is the control period
setting (*1) too short?
Set the control period to a suitable
value.
Call IDEC for assistance. END
YES
NO
*1: For detail about the control period, see page 6-46.