Mitsubishi Electric 800 Series, Instruction Manual, Page: 449 / 727

(A) Application parameters
448
PARAMETERS
5.14.1
Electronic bypass function

The coasting time when Pr.57 = "0" is as shown below. (When Pr.162 Automatic restart after instantaneous power failure selection is set to
the initial value.)
FR-A860-00027: 0.5 s
FR-A860-00061 to FR-A860-00170: 1 s
FR-A860-00320 to FR-A860-01080: 3.0 s
FR-A860-01440 or higher: 5.0 s
To decelerate the motor to a stop
at instantaneous power failure
Power failure time
deceleration-to-stop
function
P.A730 to P.A735,
P.A785 Pr.261 to Pr.266,
Pr.294
526
To operate with sequence
program
PLC function
P.A800 to P.A804,
P.A811 to P.A860
Pr.414 to Pr.417,
Pr.498,
Pr.1150 to Pr.1199
531
To store the inverter running
status to a USB memory device
Trace function
P.A900 to P.A906,
P.A910 to P.A920,
P.A930 to P.A939
Pr.1020 to Pr.1047 533
The inverter contains complicated sequence circuits for switching between the commercial power supply operation and
inverter operation. Therefore, interlock operation of the magnetic contactor for switching can be easily performed by
simply inputting start, stop, and automatic switching selection signals.
Pr. Name
Initial
value Setting
range
Description
57
A702
Restart coasting time
9999
0 Coasting time differs according to the inverter capacity.

0.1 to 30 s
Set the waiting time for the inverter to perform a restart at
power restoration after an instantaneous power failure.
9999 No restart
58
A703
Restart cushion time
1 s 0 to 60 s Set the voltage cushion time for restart.
135
A000 Electronic bypass
sequence selection
0
0 Without electronic bypass sequence
1 With electronic bypass sequence
136
A001 MC switchover interlock
time
1 s 0 to 100 s Set the operation interlock time for MC2 and MC3.
137
A002
Start waiting time
0.5 s 0 to 100 s
Set a time period that is a little longer than the time period
from the ON signal input to the actual pick-up operation of
MC3 (0.3 to 0.5 s).
138
A003
Bypass selection at a fault
0
0 Inverter output stop (motor coasting) at inverter failure
1
Automatic switchover to commercial power supply operation
at inverter failure. (Switchover is not possible when an
external thermal relay (E.OHT) or CPU fault (E.CPU) is
occurring.)
139
A004
Automatic switchover
frequency from inverter to
bypass operation
9999
0 to 60 Hz
Set the frequency where the inverter operation is switched to
commercial power supply operation.
The inverter operation is performed from a start to
Pr.139
setting, then it switches automatically to the commercial
power supply operation when the output frequency is equal
to or above
Pr.139 .
9999 Without automatic switchover
159
A005
Automatic switchover
frequency range from
bypass to inverter
operation
9999
0 to 10 Hz
Set the frequency where the commercial power supply
operation, which has been switched from the inverter
operation with
Pr.139 , switches back to inverter operation.
When the frequency command becomes less than ( Pr.139 -
Pr.159 ), the motor switches automatically to inverter
operation and operates at the frequency of the frequency
command. Turning OFF the inverter start command (STF/
STR) also switches the operation to the inverter operation.
9999
To switch the commercial power supply operation, which has
been switched from the inverter operation with
Pr.139 , to the
inverter operation again, the inverter start command (STF/
STR) is turned OFF. The operation switches to the inverter
operation, and the motor decelerates to a stop.
Purpose Parameter to set
Refer
to
page
V/F V/F V/F Magnetic flux Magnetic flux Magnetic flux Sensorless Sensorless Sensorless Vector Vector Vector