Commercial Power Supply-Inverter Switchover Function - Mitsubishi Electric FR-A700 Instruction Manual

Special operation
6.24.2 Commercial power supply-inverter switchover function (Pr. 57, Pr. 58,
Pr. 135 to Pr. 139, Pr. 159)
The complicated sequence circuit for commercial power supply-inverter switchover is built in the
inverter. Hence, merely inputting the start, stop or automatic switchover selection signal facil-
itates the interlock operation of the switchover magnetic contactor.
Pr. No. Name
57
Restart coasting time
58
Restart cushion time
Commercial power-
supply switchover
135
sequence output
terminal selection
MC switchover
136
interlock time
137
Start waiting time
Commercial power-
supply operation
138
switchover selection
at an alarm
Automatic switchover
frequency between
139
inverter and commer-
cial power-supply
operation
Automatic switchover
ON range between
159
commercial power-
supply and inverter
operation
6 - 502
Initial Setting
Description
Value Range
The following times are coasting
times.
00052 or less ........................... 0.5s,
0
00083 to 00250........................ 1.0s,
00310 to 01800........................ 3.0s,
02160 or more .......................... 5.0s
0.1
9999
01800
to
or less Set the waiting time for inverter-trig-
5s
gered restart after an instantaneous
02160 0.1
power failure.
or to
more 30s
9999 No restart
1s 0 to 60s Set a voltage starting time at restart.
With commercial power-supply
0
switchover sequence
0
Without commercial power-supply
1
switchover sequence
Set the operation interlock time of
1s 0–100s
MC2 and MC3.
Set the time slightly longer (0.3 to
0.5s or so) than the time from when
0.5s 0–100s
the ON signal enters MC3 until it actu-
ally turns on.
Inverter output is stopped (motor
0
coast) at inverter fault.
Operation is automatically switched to
0
the commercial power-supply opera-
1
tion at inverter 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
0–60Hz start until Pr. 139 is reached, and
9999
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
0–10Hz power-supply operation, the inverter
automatically switches operation to the
inverter operation and operates at the
frequency of frequency command.
When the inverter start command
9999
(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
9999
is switched from the inverter operation
to commercial power-supply inverter
operation, operation is switched to the
inverter operation and the motor
decelerates to stop.
Parameter
Parameters referred to
11 DC injection brake
operation time
57 Restart coasting
time
58 Restart cushion
time
79 Operation mode
selection
178–189 Input terminal
function selection
190–196 Output terminal
function selection
Refer to
Section
6.13.1
6.16.1
6.16.1
6.22.1
6.14.1
6.14.5