Mitsubishi Electric FR-F740 EC Instruction Manual page 307

Parameter
● Without frequency search
When Pr. 162 is set to "1" or "11", automatic restart operation is performed in a reduced
voltage system, where the voltage is gradually risen with the output frequency unchanged
from prior to an instantaneous power failure independent of the coasting speed of the motor.
(L1, L2, L3)
frequency
The output shut off timing differs according to the load condition.
NOTE This system stores the output frequency prior to an instantaneous power failure and incre-
ases the voltage. Therefore, if the instantaneous power failure time exceeds 0.2s, the inver-
ter starts at Pr. 13 "Starting frequency" (initial value = 0.5Hz) since the stored output
frequency cannot be retained.
● Restart operation at every start
When Pr. 162 is set to "10" or "11", automatic restart operation is also performed every start,
in addition to the automatic restart after instantaneous power failure. When Pr. 162 = 0 or
1, automatic restart operation is performed at the first start after power supply-on, but the
inverter starts at the starting frequency at the second time or later.
FR-F700 EC
Power failure
Power
supply
Motor
speed
[r/min]
Output
[Hz]
Output
voltage
[V]
Coasting time
Pr. 57 Restart
Fig. 6-89:
Automatic restart without frequency search
(Pr. 162 = 1/11)
cushion time
Pr. 58
Operation selection at power failure
I000647C
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