(A) Application parameters
• 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
Operation
• 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
MRS
OFF
Power ON
(OFF)
At start
OFFON
(Inverter)
During constant-
speed operation
ON
(commercial power
supply)
For deceleration,
switched to the
ON
inverter operation
(inverter)
Stop
ON
452
PARAMETERS
C
A
A
B : Pr.137 Start waiting time
D : Pr.58 Restart cushion time
CS
STF
OFF
OFF
(OFF)
(OFF)
OFFON
OFFON
ONOFF
ON
OFFON
ON
ON
ONOFF
Pr.159
B
C
D
A
• 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.)
MC1
MC2
OFFON
OFF
(OFFON)
(OFF)
ON
OFF
ON
OFFON
ON
ONOFF
ON
OFF
A
B
C
D
MC3
Remarks
OFFON
External operation mode
(OFFON)
(PU operation mode)
ON
MC2 turns ON after MC3
turns OFF.
ONOFF
Waiting time is 2 s (while
coasting).
MC3 turns ON after MC2
turns OFF.
OFFON
Waiting time is 4 s (while
coasting).
ON
Time
Time