Instantaneous Power Failure - Mitsubishi Electric FR-A700 Technical Manual

4.5.2 Bypass inverter switch-over operation
Bypass operation can be changed over to inverter operation without stopping the motor.
≠
(Setting [Pr. 57 9999] will make the restart function valid.)
MCCB
Power
supply
F
X
*1 For , when coasting the motor to a stop by pressing the stop pushbutton in the inverter mode, modify the circuit
F700
A700
as shown below:
*2 By pressing the inverter operation pushbutton, bypass operation can be changed over to inverter operation without stopping the
motor.
*3 For , when the inverter is tripped due to an instantaneous power failure (IPF), the motor restarts automatically
F700
A700
when power is restored. (Note that when there is no type RD instantaneous power failure relay, the motor is coasted to a stop
when the relay or MC turns OFF, and does not restart automatically.)
*4 When an inverter trip occurs, inverter operation is changed over to bypass operation. (When the RA1 marked *4 is removed,
bypass backup operation is not performed.)
*5 When the stop pushbutton is pressed during inverter operation, the motor is inverter-controlled from deceleration to a stop.
(When coating the motor to a stop, modify the circuit portions marked *1 and *7.)
*6 When the power supply is 400V class, install a step-down transformer.
*7 do not have CS signal. Assign MRS signal and set the MRS signal logic as normally closed ([Pr. 17=2]). Also,
E700 D700
set to perform frequency search at every power ON ([Pr. 162 =10]) for automatic restart after instantaneous power failure.
MC
T
*6
(3)
Frequency setting
(2)
Y
potentiometer
2W1k
(1)
SD
CR2
STF
CS
common
(common)
Inverter
R U
S V
T W
B
Fault signal
C
Reset
10
RES
2
SD
5
STF
*7
CS
570
PRACTICAL CIRCUITS
MC1 OCR
MI
MC2
IM
Related parameters
Restart selection [Pr. 57, 58]
(Set [Pr. 57 9999])
Reset selection [Pr. 75]
PB
*1
RA2 CR2
Motor