Mitsubishi Electric FR-A700 Instruction Manual page 686

Special operation
Commercial power supply-inverter switchover operation sequence
● Operation sequence example when there is no automatic switchover sequence (Pr. 139 =
9999)
Operation interlock
Run command
Inverter/commer-
cial power-supply
switchover (CS)
Input side MC
Output side MC
MC for commercial
operation (MC2)
Operating status
(motor speed)
Fig. 6-249: Signal timing when there is no automatic switchover sequence
● Operation sequence example when there is automatic switchover sequence (Pr. 139 ≠ 9999,
Pr. 159 = 9999)
Output frequency
Frequency command
Inverter operation
Commercial power-
supply operation
Fig. 6-250: Signal timing when there is automatic switchover sequence
6 - 506
Power supply
(MRS)
(STF)
Off only at inverter alarm
(MC1)
(MC3)
power-supply
Each timer
STF
Actual motor
speed
MC3
MC2
A: Pr. 136: MC switchover interlock time
B: Pr. 137: Start waiting time
C: Pr. 57: Restart coasting time
D: Pr. 58: Restart cushion time
Inverter Coasting Commercial
Coasting
operation power-supply
operation
ON: Operation enabled
OFF:Operation disabled
ON: Forward rotation
OFF:Stop
ON: Inverter operation
OFF:Commercial power-
supply operation
Pr. 136:MC switchover interlock time
Pr. 137:MC3 start (waiting time)
Pr. 57:Reset time
Pr. 58:Switchover cushion time
Inverter Stop
operation
Parameter
Delay time
until the MC
turns on (off).
I001239E
Time
Time
I001240E