Mitsubishi Electric FR-F740 EC Instruction Manual page 505

Parameter
When the operation method is changed to PID control from another control
When the control method is changed to PID control from a control with higher priority in frequency
command (multi-speed setting, Jog operation, etc.), the motor is accelerated/decelerated until its
speed reaches the automatic switchover frequency, and the pre-charge is performed.
Output signal
Fig. 6-193: When the operation method is changed to PID control from another control
Pre-charge protective function
The protective function is activated when the elapsed time or measured amount reaches the set
level during the pre-charge operation. When the level is exceeded, Y51 to Y54 signals are
turned ON depending on the control method, the output is shutoff, and the fault (E.PCH) is out-
put. For Pr. 760 Pre-charge fault selection, select to shutoff the output and output the fault im-
mediately after a fault occurrence (Pr. 760 = 0), or to output the fault after deceleration to a stop
(Pr. 760 = 0). (Pre-charge protective function is effective whether the pre-charge ending con-
ditions are set or not.)
Pre-charge limit level setting is available when the following conditions are satisfied:
– Ending time (Pr. 762) < Time limit (Pr. 764)
– Ending level (Pr. 761) < Upper detection level (Pr. 763)
NOTE When the protective function activates (including during deceleration to stop), Y51 to Y54
signals are kept ON once they are output whether PID control is valid or invalid. If a fault
occurs after deceleration to stop, the fault is output after the stop whether PID control is valid
or invalid.
The output of signal Y51 to Y54 can be released by a reset or the retry operation.
FR-F700 EC
Pr. 127
Multi-speed operation
0Hz
STF
RH
Y47
Y49
Pr. 762
PID control
Pre-charge
PID control
Time
I002315E
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