Electronic Bypass Function - Mitsubishi Electric FR-A820-00046 Instruction Manual

Parameters
5.14.1

Electronic bypass function

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
A702
58
A703
135
A000
136
A001
137
A002
138
A003
139
A004
159
A005
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-A820-00105(1.5K) or lower and FR-A840-00052(1.5K) or lower: . . . . . . .0.5 s
FR-A820-00167(2.2K) to FR-A820-00490(7.5K) and
FR-A840-00083(2.2K) to FR-A840-00250(7.5K): . . . . . . . . . . . . . . . . . . . . . . . . . .1 s
FR-A820-00630(11K) to FR-A820-03160(55K) and
FR-A840-00310(11K) to FR-A840-01800(55K): . . . . . . . . . . . . . . . . . . . . . . . . . . .3.0 s
FR-A820-03800(75K) or higher and FR-A840-02160(75K) or higher: . . . . . .5.0 s
FR-A800
Name
Restart coasting time
Restart cushion time
Electronic bypass sequence
selection
MC switchover interlock time
Start waiting time
Bypass selection at a fault
Automatic switchover
frequency from inverter to
bypass operation
Automatic switchover
frequency range from bypass
to inverter operation
V/F V/F V/F Magnetic flux Magnetic flux Magnetic flux Sensorless Sensorless Vector Sensorless
Initial Setting
Description
value range
Coasting time differs according to the inverter
0
capacity.
Set the waiting time for the inverter to perform a
9999
0.1 to 30 s restart at power restoration after an instantaneous
power failure.
9999 No restart
1 s 0 to 60 s Set the voltage cushion time for restart.
0 Without electronic bypass sequence
0
1 With electronic bypass sequence
1 s 0 to 100 s Set the operation interlock time for MC2 and MC3.
Set a time period that is a little longer than the time
0.5 s 0 to 100 s period from the ON signal input to the actual pick-up
operation of MC3 (0.3 to 0.5 s).
Inverter output stop (motor coasting) at inverter
0
failure
Automatic switchover to commercial power supply
0
operation at inverter failure. (Switchover is not
1
possible when an external thermal relay (E.OHT) or
CPU fault (E.CPU) is occurring.)
Set the frequency where the inverter operation is
switched to commercial power supply operation.
The inverter operation is performed from a start to
0 to 60 Hz
Pr. 139 setting, then it switches automatically to the
9999
commercial power supply operation when the output
frequency is equal to or above Pr. 139.
9999 Without automatic switchover
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
0 to 10 Hz
switches automatically to inverter operation and
operates at the frequency of the frequency
command. Turning OFF the inverter start command
9999
(STF/STR) also switches the operation to the inverter
operation.
To switch the commercial power supply operation,
which has been switched from the inverter operation
with Pr. 139, to the inverter operation again, the
9999
inverter start command (STF/STR) is turned OFF. The
operation switches to the inverter operation, and the
motor decelerates to a stop.
(A) Application parameters
Vector Vector
5 - 471