Mitsubishi Electric FR-F740 EC Instruction Manual page 530

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
Input side MC
Output side MC
MC for commercial
operation (MC2)
Operating status
(motor speed)
Fig. 6-209: 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. 6-210: Signal timing when there is automatic switchover sequence
6 - 380
Power supply
(MRS)
(STF)
(CS)
Off only at inverter alarm
(MC1)
(MC3)
power supply
Pr.136
Each timer
Commercial
power supply
operation
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
Pr.137
Pr.58
Pr.136
Pr.136 Pr.57
Coast- Inverter Coast- Commer-
ing operation ing cial power
supply
operation
Pr. 136: MC switchover interlock time
Pr. 137: MC3 start (waiting time)
Pr. 57: Reset time
Pr. 58: Switchover cushion time
ON: Operation enabled
OFF: Operation disabled
ON: Forward rotation
OFF: Stop
ON: Inverter operation
OFF: Commercial power
Delay time
Pr.137
Pr.58
until the MC
turns on (off).
Pr.136 Pr.57
Coast- Inverter Stop
ing operation
Parameter
supply operation
I002318E
Time
Time
I001240E