Commercial Power Supply-Inverter Switchover Function (Pr. 135 To Pr. 139, Pr. 159) - Mitsubishi Electric FR-F740-00023-EC Instruction Manual

Special operation and frequency control

3.19.2 Commercial power supply-inverter switchover function (Pr. 135 to Pr. 139, Pr. 159)

The complicated sequence circuit for commercial power supply-inverter switchover is built in the inverter. Hence,
Pr. 134
merely inputting the start, stop or automatic switchover selection signal facilitates the interlock operation of the
page 190
switchover magnetic contactor.
Pr. 140
page 82
Pr. 158
Parameter
page 110
Number
Pr. 160
page 146
Commercial power-supply
135 switchover sequence output
terminal selection
136 MC switchover interlock time
137 Start waiting time
Commercial power-supply
138 operation switchover selection at
an alarm
Automatic switchover frequency
139 between inverter and commercial
power-supply operation
Automatic switchover ON range
159 between commercial power-
supply and inverter operation
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 146.)
⋅ 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 switch between inverter operation and commercial power supply operation, an interlock must be provided to stop
the motor once and then start it by the inverter in order to prevent the inverter from resulting in an overcurrent alarm.
Using the commercial power supply switchover 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.
198
Initial
Name
Value
0
1s
0.5s
0
9999
9999
Setting
Range
Without commercial power-supply switchover
0
sequence
With commercial power-supply switchover
1
sequence
0 to 100s Set the operation interlock time of MC2 and MC3.
Set the time slightly longer (0.3 to 0.5s or so) than the
0 to 100s time from when the ON signal enters MC3 until it
actually turns on.
Inverter output is stopped (motor coast) at inverter
0
fault.
Operation is automatically switched to the
commercial power-supply operation at inverter fault
1
(Not switched when an external thermal error
occurs)
Set the frequency to switch the inverter operation to
the commercial power-supply operation.
Inverter operation is performed from a start until Pr.
0 to 60Hz
139 is reached, and when the output frequency is at
or above Pr. 139, inverter operation is automatically
switched to commercial power supply operation.
9999 Without automatic switchover
Valid during automatic switchover operation (Pr. 139 ≠
9999)
When the frequency command decreases below (Pr.
139 minus Pr. 159) after operation is switched from
inverter operation to commercial power-supply
0 to 10Hz
operation, the inverter automatically switches
operation to the inverter operation and operates at
the frequency of frequency command. When the
inverter start command (STF/STR) is turned off,
operation is switched to the inverter operation also.
Valid during automatic switchover operation (Pr. 139 ≠
9999)
When the inverter start command (STF/STR) is
turned off after operation is switched from the
9999
inverter operation to commercial power-supply
inverter operation, operation is switched to the
inverter operation and the motor decelerates to
stop.
Description