Electronic Bypass Function - Mitsubishi Electric 800 Series Instruction Manual

(A) Application parameters
Purpose
To decelerate the motor to a stop
at instantaneous power failure
To operate with sequence
program
To store the inverter running
status to a USB memory device
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. Name
57
Restart coasting time
A702
58
Restart cushion time
A703
135 Electronic bypass
A000 sequence selection
136 MC switchover interlock
A001 time
137
Start waiting time
A002
138
Bypass selection at a fault
A003
Automatic switchover
139
frequency from inverter to
A004
bypass operation
Automatic switchover
159 frequency range from
A005 bypass to inverter
operation

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
448
PARAMETERS
Power failure time
deceleration-to-stop
function
PLC function
Trace function
Initial Setting
value range
0
9999 0.1 to 30 s
9999
1 s 0 to 60 s
0
0
1
1 s 0 to 100 s
0.5 s 0 to 100 s
0
0
1
0 to 60 Hz
9999
9999
0 to 10 Hz
9999
9999
Parameter to set
P.A730 to P.A735,
P.A785
P.A800 to P.A804,
P.A811 to P.A860
P.A900 to P.A906,
P.A910 to P.A920,
P.A930 to P.A939
V/F V/F V/F Magnetic flux Magnetic flux Magnetic flux Sensorless
Description
Coasting time differs according to the inverter capacity.
Set the waiting time for the inverter to perform a restart at
power restoration after an instantaneous power failure.
No restart
Set the voltage cushion time for restart.
Without electronic bypass sequence
With electronic bypass sequence
Set the operation interlock time for MC2 and MC3.
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).
Inverter output stop (motor coasting) at inverter failure
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.)
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.
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 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.
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.
Refer
to
page
Pr.261 to Pr.266,
526
Pr.294
Pr.414 to Pr.417,
Pr.498, 531
Pr.1150 to Pr.1199
Pr.1020 to Pr.1047 533
Sensorless Vector Sensorless Vector Vector
