Mitsubishi Electric FR-F700PJ Series, Instruction Manual

Page: 171 / 356

166
Operation selection at power failure and instantaneous power failure
4.13.2 Automatic restart after instantaneous power failure/flying start under IPM
motor control (Pr. 57, Pr. 162, Pr. 611)
<IPM>
(2) Restart coasting time (Pr. 57)
 Coasting time is the time from when the motor speed is detected until automatic restart control is started.
 Set Pr. 57 to "0" (without coasting time) to perform automatic restart operation.
Generally this setting will pose no problems.
 Operation may not be performed well depending on the magnitude of the moment of inertia (J) of the load or running
frequency. Adjust the coasting time between 0.1s and 5s according to the load specifications.
You can restart the inverter without stopping the motor in the following cases:

When power comes back ON after an instantaneous power failure

When motor is coasting at start
Parameter
Number
Name Initial Value Setting Range Description
57
Restart coasting time 9999
0 No waiting time
0.1 to 5s
Set the waiting time for inverter-
triggered restart after an
instantaneous power failure.
9999 No restart
162
Automatic restart after
instantaneous power failure
selection
1
0, 1 Frequency search at an initial start
10, 11 Frequency search at every start
611
Acceleration time at a restart 9999
0 to 3600s
Set the acceleration time that takes
to reach
Pr.20 Acceleration/
deceleration reference frequency setting
at a restart.
9999
Standard acceleration time (like Pr. 7 )
is applied at restart.
The above parameters can be set when Pr. 160 Extended function display selection = "0". (Refer to page 197)
(1) Automatic restart operation
 The inverter smoothly starts after detecting the motor speed
(frequency search) upon power restoration.
 During reverse rotation, the inverter can be restarted
smoothly as the direction of rotation is detected.
 Restart operation at every start
When
Pr. 162
= "10 (11)", automatic restart operation is also
performed every start, in addition to the automatic restart
after instantaneous power failure. When
Pr. 162
= "0 (1)",
automatic restart operation is performed at the first start
after power supply-ON, but starts at the starting frequency at
the second time or later.
IPM IPM IPM
Instantaneous (power failure) time
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 )
Speed
detection time
+
Acceleration time
at a restart
(
Pr. 611
setting) * The output shut off timing differs
according to the load condition.
*
REMARKS
Since the DC injection brake is operated instantaneously
when the speed is detected at a restart, the speed may
reduce if the moment of inertia (J) of the load is small.
REMARKS
Automatic restart operation with reduced voltage is not
available under IPM motor control. While
Pr. 162 = "1 or 11,"
automatic restart operation is performed with a frequency
search (setting "0 or 10").