Справочник Пользователя для Mitsubishi Electronics FR-F740P

⋅ When the motor is operated at 60Hz (or 50Hz), more efficient operation can be performed by the commercial power

supply than by the inverter. When the motor cannot be stopped for a long time for the maintenance/inspection of the
inverter, it is recommended to provide the commercial power supply circuit.

⋅ To avoid commercial power supply being applied to the inverter output side when switching between inverter

operation and commercial power supply operation, provide an interlock which the MC of the commercial power
supply side turns ON only when the MC of the inverter output side is OFF. Using the electronic bypass sequence
function that outputs the timing signal for operation of the magnetic contactor, a complicated commercial power
supply switchover interlock can be provided by the inverter.

The complicated sequence circuit for bypass operation is built in the inverter. Hence, simply inputting the start,
stop or automatic switchover selection signal facilitates the interlock operation of the switchover magnetic
contactor.

9999

0

⋅ 1.5K or lower.....................................................0.5s,
⋅ 2.2K to 7.5K

.................................................1s,

⋅ 11K to 55K

...................................................3.0s,

⋅ 75K or higher ....................................................5.0s,
The above times are coasting time.

55K or 

lower

0.1 

to 5s

Set the waiting time for inverter-triggered restart after an 
instantaneous power failure.

75K or 

higher

0.1 

to 

30s

9999

No restart

1s

0 to 60s

Set a voltage starting time at restart.

0

0

Without electronic bypass sequence

1

With electronic bypass sequence

1s

 0 to 100s

Set the operation interlock time of MC2 and MC3.

0.5s

 0 to 100s

Set the time slightly longer (0.3 to 0.5s or so) than the time
from when the ON signal enters MC3 until it actually turns
ON.

0

0

Inverter output is stopped (motor coast) at inverter fault.

1

Operation is automatically switched to bypass operation 
at inverter fault (Not switched when an external thermal 
relay operation (E.OHT) or CPU fault (E.CPU) occurs).

9999

 0 to 60Hz

Set the frequency to switch inverter operation to bypass 
operation.
Inverter operation is performed from a start until Pr. 139 
is reached, and when the output frequency is at or 
above Pr. 139, inverter operation is automatically 
switched to bypass operation.

9999

Without automatic switchover

9999

 0 to 10Hz

Valid during automatic switchover operation (Pr. 139 

≠ 

9999)
When the frequency command decreases below (Pr. 139 
- Pr. 159) after operation is switched from inverter 
operation to bypass operation, the inverter automatically 
switches operation to inverter operation and operates at 
the frequency of frequency command. When the inverter 
start command (STF/STR) is turned OFF, operation is 
switched to inverter operation also.

9999

Valid during automatic switchover operation (Pr. 139 

≠ 

9999)
When the inverter start command (STF/STR) is turned 
OFF after operation is switched from inverter operation 
to bypass operation, operation is switched to inverter 
operation and the motor decelerates to stop.

The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 201.)

V/F

V/F

V/F

S

 MFVC

S

 MFVC

S

 MFVC