Mitsubishi Electric FR-A700 Technical Manual page 534

4.4.4 Soft starter is used to soft-start/soft-stop two motors at the same time
common
MCCB MC
Power
supply
*1 Use the signal of the relay R2 to make a soft start/soft stop. Turn OFF the relay R1 after the motor has stopped. If it is turned
OFF during motor operation, the motor may decelerate at the acceleration/deceleration time in the inverter, resulting in an OVT
trip.
*2 The times of acceleration and deceleration made by the FR-FC soft starter are as indicated below at the maximum output
voltage. (For the specifications of 90s or longer, contact the manufacturer.)
Standard:
C1-C2-C3 shorted: 5 to 50s adjustable
*3 Set the acceleration/deceleration time of the inverter to the minimum value of 0s.
*4 When an inverter with a regenerative brake resistor is used for cyclic or heavy duty operation, it is recommended to install a
magnetic contactor in the primary side to prevent discharging resistor from overheat/burnout if the regenerative brake transistor
is damaged due to the thermal capacity shortage of the discharging resistor, and excessive regenerative brake duty, etc.
*5 Provide a control transformer when the power supply is 400V class.
*4
Inverter No. 1
R
S
T
(STR)
STF SD
R1
Ground
T
*5
Frequency setting
potentiometer
F
Ready
OFF ON
R
R
Start signal
0.15 to 1.3s adjustable
U
Motor
V IM
W
10
2
5
2 5
Soft starter
FR-FC
12 55
R2
2W1k
R
R
1
R
2
C1-C2 shorted:
C1-C2-C3-C4 shorted:
568
PRACTICAL CIRCUITS
Inverter No. 2
R U
S V
T W
Ground
2
5
(STR)
STF SD
R1
0
Related parameters
Acceleration/deceleration time [Pr. 7, 8]
0.75 to 7.5s adjustable
10 to 90s adjustable
(common)
Motor
IM