Mitsubishi Electric 800 Series Instruction Manual page 365

 Restart operation without frequency search (Pr.162 = "1 or 11")
• When Pr.162 = "1 or 11", reduced voltage start is used for the restart operation. In this method, the voltage is raised
gradually while keeping the output frequency level at the level before an instantaneous power failure, regardless of the
motor's coasting speed.
V/F control, Advanced magnetic flux vector control
Power supply
(R/L1, S/L2,
T/L3)
Motor speed N
(r/min)
Inverter output
frequency f(Hz)
Inverter output
voltage E(V)
Coasting time
Pr.57 setting
* The output shut off timing differs according to the load condition.
NOTE
• This restart method uses the output frequency that was active before the instantaneous power failure stored in memory. If the
instantaneous power failure time is 0.2 second or more, the output frequency can no longer be stored and held in memory, so
the restart is performed from Pr.13 Starting frequency (initial value: 0.5 Hz).
• During Real sensorless vector control, the operation is the same as one when Pr.162 = "0 or 10".
 Restart at every start (Pr.162 = "10 or 11")
• When "10 or 11" is set in Pr.162, a restart operation is performed at each start and automatic restart after instantaneous
power failure (after the time period set in Pr.57 elapsed). When "0 (initial value) or 1" is set in Pr.162, a restart operation
is performed at the first start after a power-ON, and from the second power-ON onwards, a start from the starting frequency
is performed.
 Automatic restart operation of the MRS (X10) signal
• The restart operation after restoration from output shutoff by the MRS (X10) signal is as shown in the following table
according to the Pr.30 setting.
Pr.30 setting
2
Other than the above
NOTE
• When output is shut off using safety stop function (terminals S1 and S2), the inverter restarts in the same way as when output
is shut off by the MRS (X10) signal.
• Operation is selectable as shown in the table above when Pr.162 Automatic restart after instantaneous power failure
selection = "0 or 1". When Pr.162 Automatic restart after instantaneous power failure selection = "10 or 11" (automatic
restart operation at each start), a restart operation is performed regardless of the setting of Pr.30 Regenerative function
selection.
• Set "24" in any parameter from Pr.178 to Pr.189 (Input terminal function selection) to assign the output stop (MRS) signal
to the input terminal, and "10" to assign the Inverter operation enable (X10) signal.
 Adjustment of restart coasting time (Pr.57)
• Restart coasting time is the time period from the occurrence of instantaneous power failure until the operation is restarted
after power is restored.
With frequency search, the motor speed is detected and operation is restarted after the coasting time.
364
14.(A) Application Parameters
14.7 Automatic restart after instantaneous power failure / flying start with an induction motor
Instantaneous (power failure) time
*
Restart cushion time
(Pr.58 setting)
Operation after restoration from output shutoff by the MRS (X10) signal
Restart operation (starting from the coasting speed)
Starting from Pr.13 Starting frequency.