Mitsubishi Electric FR-A700 Series, Technical Manual

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568
PRACTICAL CIRCUITS
4.4.4 Soft starter is used to soft-start/soft-stop two motors at the same time
(common)
*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.)
*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.
Standard: 0.15 to 1.3s adjustable C1-C2 shorted: 0.75 to 7.5s adjustable
C1-C2-C3 shorted: 5 to 50s adjustable C1-C2-C3-C4 shorted: 10 to 90s adjustable
common
MC
R
S
T
10
2
5
IM
U
V
W
R
S
T
IM
U
V
W
R
R2
R
1
R
2
F
R
OFF ON
R
(STR)
STF SD
R1
(STR)
STF SD
R1
2
5
2 5
0
12 55
T
*5
MCCB
*4
Related parameters
Acceleration/deceleration time [ Pr. 7, 8 ]
Power
supply
Inverter No. 1
Ground
Motor
Inverter No. 2
Motor
Ground
Ready
Start signal
Soft starter
FR-FC
Frequency setting
potentiometer
2W1k