Mitsubishi Electric 800 Series Instruction Manual page 377

5.11.1 Electronic bypass function
V/F V/F V/F Magnetic flux Magnetic flux Magnetic flux
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.
57 Restart coasting time
A702
58 Restart cushion time
A703
135 Electronic bypass sequence
A000 selection
136 MC switchover interlock time
A001
137 Start waiting time
A002
138 Bypass selection at a fault
A003
139 Automatic switchover
A004 frequency from inverter to
bypass operation
159 Automatic switchover
A005 frequency range from bypass
to inverter operation
*1 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-F860-00027: 0.5 s
FR-F860-00061 and FR-F860-00090: 1.0 s
FR-F860-00170 to 00680: 3.0 s
FR-F860-01080 or higher: 5.0 s
376
5. PARAMETERS
5.11 (A) Application parameters
Name Initial
value
9999
1 s
0
1 s
0.5 s
0
9999
9999
Setting range
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
0 to 60 s Set the voltage cushion time for restart.
0 Without electronic bypass sequence
1 With electronic bypass sequence
0 to 100 s Set the operation interlock time for MC2 and MC3.
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).
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 operation (E.OHT), CPU fault (E.CPU),
or output short-circuit fault (E.SCF) is occurring, or when
output side earth (ground) fault overcurrent (E.GF) is
occurring while Pr.249 = "2".)
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
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.
Description
*1