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Bypass-inverter Switchover Function (pr. 57, Pr. 58, Pr. 135 To Pr. 139, Pr. 159); V/fsmfvc - Mitsubishi Electric FR-F720P-0.75K to 110K Instruction Manual

Fr-f700p series.
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Special operation and frequency control

4.21.2 Bypass-inverter switchover function (pr. 57, Pr. 58, Pr. 135 to Pr. 139, Pr. 159)

S
S
S
V/F
V/F
V/F
MFVC
MFVC
MFVC
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.
Parameter
Number
57
Restart coasting time
58
Restart cushion time
Electronic bypass sequence
135
selection
MC switchover interlock
136
time
137
Start waiting time
138
Bypass selection at a fault
Automatic switchover
139
frequency from inverter to
bypass operation
Automatic switchover
159
frequency range from
bypass to inverter operation
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 201.)
⋅ 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.
274
< V / F > < S M F V C >
Initial
Name
Value
9999
1s
0
1s
0.5s
0
9999
9999
Setting
Range
⋅ 1.5K or lower .....................................................0.5s,
⋅ 2.2K to 7.5K
⋅ 11K to 55K
0
⋅ 75K or higher .................................................... 5.0s,
The above times are coasting time.
55K or
0.1
lower
to 5s
Set the waiting time for inverter-triggered restart after an
0.1
instantaneous power failure.
75K or
to
higher
30s
9999
No restart
0 to 60s
Set a voltage starting time at restart.
0
Without electronic bypass sequence
1
With electronic bypass 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 time
0 to 100s
from when the ON signal enters MC3 until it actually turns
ON.
0
Inverter output is stopped (motor coast) at inverter fault.
Operation is automatically switched to bypass operation
1
at inverter fault (Not switched when an external thermal
relay operation (E.OHT) or CPU fault (E.CPU) occurs).
Set the frequency to switch inverter operation to bypass
operation.
Inverter operation is performed from a start until Pr. 139
0 to 60Hz
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
Valid during automatic switchover operation (Pr. 139 ≠
9999)
When the frequency command decreases below (Pr. 139
- Pr. 159) after operation is switched from inverter
0 to 10Hz
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.
Valid during automatic switchover operation (Pr. 139 ≠
9999)
When the inverter start command (STF/STR) is turned
9999
OFF after operation is switched from inverter operation
to bypass operation, operation is switched to inverter
operation and the motor decelerates to stop.
Description
.................................................
...................................................
1s,
3.0s,

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