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Mitsubishi Electronics FR-A700 Manuel D’Utilisation

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(2) Electronic bypass operation sequence
⋅ Operation sequence example when there is no automatic switchover sequence (Pr. 139 = "9999")
⋅ Operation sequence example when there is automatic switchover sequence (Pr. 139 ≠ "9999", Pr. 159 = "9999")
⋅ Operation sequence example when there is automatic switchover sequence (Pr. 139 ≠ "9999", Pr. 159 ≠  "9999")
ON
OFF
Power supply
ON
OFF
Operation interlock
ON
OFF
Inverter run command
ON
OFF
(MRS)
(STF)
ON
OFF
Inverter input side MC
(MC1)
ON
OFF
ON
OFF
Each timer
Coasting
Stop
Coasting
 ON : Operation enabled
OFF: Operation disabled
 ON : Forward rotation
OFF: Stop
 ON : Inverter operation
OFF: Bypass operation
Pr. 136 MC switchover interlock time
Pr. 137 MC3 start (waiting time)
Pr. 57 Reset time
Pr. 58 Switchover cushion time
Off only at inverter alarm
Inverter output side MC
(MC3)
Pr. 136
Pr. 57
Pr. 136
Pr. 57
Pr. 58
Pr. 137
Inverter/bypass (CS)
MC for bypass 
operation (MC2)
Operating status 
(motor speed)
INV 
operation
Bypass 
operation
INV 
operation
Indicates the delay time until 
the MC turns on (off).
STF
Frequency command
Output frequency Pr. 139
Time
Time
Actual motor speed
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
MC3
ON
OFF
ON
OFF
MC2
ON
OFF
C
A
A
B
C
D
INV 
operation
Bypass 
operation
STF
Frequency command
Output frequency
Pr. 139
Pr. 159
Time
Time
Actual motor speed
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
MC3
ON
OFF
ON
OFF
MC2
ON
OFF
C
A
A
B
C
D
A
A
B
C
D
INV 
operation
Bypass 
operation