Commercial Power Supply-Inverter Switchover Function (Pr. 135 To Pr. 139, Pr. 159) - Mitsubishi Electric F700 Instruction Manual

Special operation and frequency setting

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.
Pr. 134
Hence, merely inputting the start, stop or automatic switchover selection signal facilitates the interlock
page 184
Pr. 140 operation of the switchover magnetic contactor.
page 77
Pr. 158
Parameter
page 104
Number
Pr. 160
page 140
Power-supply switchover
135 sequence output terminal
selection
136 MC switchover interlock time
137 Waiting time at a start
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 140.)
⋅ 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.
192
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
Set the operation interlock time of MC2 and
0 to 100s
MC3.
Set the time slightly longer (0.3 to 0.5s or so) than
0 to 100s the time from when the ON signal enters MC3 until
it actually turns on.
Inverter output is stopped (motor coast) at
0
inverter fault.
Operation is automatically switched to the
commercial power-supply operation at inverter
1
fault (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
0 to 60Hz
Pr. 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 to 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