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Special operation and frequency control
(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")
Each timer
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
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
Inverter output side MC
(MC3)
Inverter/bypass (CS)
MC for bypass
operation (MC2)
Operating status
(motor speed)
Indicates the delay time until
the MC turns ON (OFF).
Pr.136
Pr.136
Pr.57
Pr.58
Pr.137
Pr.136
Pr.57
Pr.136
Pr.58
Pr.137
Coasting
StopCoasting
INV
operation
Bypass
operation
INV
operation
Bypass
operation
Coasting
Off only at inverter fault
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
AAB 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
AAB C D AAB C D
INV
operation
Bypass
operation