• Example of operation sequence with automatic bypass sequence (Pr.139 "9999", Pr.159 "9999")
ON
STF
OFF
Output frequency Pr.139
Frequency command
Actual motor speed
INV
ON
MC3
operation
OFF
Commercial
ON
MC2
power supply
OFF
operation
A : Pr.136 MC switchover interlock time
C : Pr.57 Restart coasting time
Operating procedure
• Operation flowchart
Power supply ON
Setting the parameters
Start inverter operation
Constant-speed commercial
power supply operation
Deceleration (stop)
inverter operation
• Signal operation after setting parameters
Status
Power ON
OFF
(OFF)
At start (Inverter)
OFFON
During constant-
ON
speed operation
(commercial power
supply)
For deceleration,
ON
switched to the
inverter operation
(inverter)
Stop
ON
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5. PARAMETERS
5.11 (A) Application parameters
C
A
B : Pr.137 Start waiting time
D : Pr.58 Restart cushion time
• Pr.135 = "1"
• Pr.136 = "2.0 s"
• Pr.137 = "1.0 s" (Set the time until MC3 is actually turned ON and the inverter and
motor are electrically connected. If the time is short, the restart may not function
properly.)
• Pr.57 = "0.5 s"
• Pr.58 = "0.5 s" (Always set this to switchover from the commercial power supply
operation to the inverter operation.)
MRS
CS
STF
OFF
OFF
(OFF)
(OFF)
OFFON
OFFON
ONOFF
ON
OFFON
ON
ON
ONOFF
Pr.159
A
B
C
D
A
MC1
MC2
OFFON
OFF
(OFFON)
(OFF)
ON
OFF
ON
OFFON
ON
ONOFF
ON
OFF
Time
A
B
C
D
MC3
Remarks
OFFON
External operation mode
(OFFON)
(PU operation mode)
ON
ONOFF
MC2 turns ON after MC3
turns OFF.
Waiting time is 2 s (while
coasting).
OFFON
MC3 turns ON after MC2
turns OFF.
Waiting time is 4 s (while
coasting).
ON
Time