Mitsubishi Electric 700 Series, Instruction Manual

Page: 291 / 416

280
PID control
(2) 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 output. For
Pr. 760 Pre-charge fault selection , select to shutoff the output and
output the fault immediately 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 conditions 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 )
REMARKS
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.
Limit by time
The fault (E.PCH) is output
when the elapsed time reaches
Pr. 764 Pre-charge time limit . With
Pr. 760 Pre-charge fault selection ,
you can select to shut off the
output and output the fault
immediately after E.PCH, or to
output the fault after
deceleration to a stop.
Retry operation is performed at
the fault output (E.PCH) only if
Pr. 65 = "0 or 4."
Limit by the measured amount
The fault (E.PCH) is output
when the measured amount
exceeds
Pr. 763 Pre-charge upper
detection level
. With
Pr. 760 Pre-
charge fault selection
, you can
select to shut off the output and
output the fault immediately
after E.PCH, or to output the
fault after deceleration to a stop.
Retry operation is performed at
the fault output (E.PCH) only if
Pr. 65
= "0 or 4."
Output frequency[Hz]
Pr.761
Pr.127
0 Hz
STF
Measured value[PSI]
Output signal
Y49
Pre-charge
Pr.764
Y51
When
Pr. 760
=1,
the fault is output after
deceleration to a stop.
When
Pr. 760
=1,
the fault is output after
deceleration to a stop.
When
Pr. 760
=0,
the output is immediately
shutoff and the fault is output.
When
Pr. 760
=0,
the output is immediately
shutoff and the fault is output.
ALM
Time
Time
Over time limit
Ending level
Time limit
E.PCH
E.PCH
Pr.127
0 Hz
STF
Pr.762
Output frequency[Hz]
Output signal
Y49
Pre-charge
Pr.763
Measured value[PSI]
Y53
ALM
Exceeding measured amount
Time
Time
When
Pr.760
=1, the fault is output after
deceleration to a stop.
When
Pr.760
=1, the fault is output after
deceleration to a stop.
When
Pr.760
=0,
the output is immediately
shutoff and the fault is output.
When
Pr.760
=0,
the output is immediately
shutoff and the fault is output.