Mitsubishi Electric FR-F700PJ Series Manual page 39

30, 57, 58, 162, 165, 299, 611
Automatic restart after instantaneous
power failure/flying start under General-
purpose motor control
Pr.30 Regenerative function selection
Pr.58 Restart cushion time
Pr.162 Automatic restart after instantaneous power failure selection
Pr.165 Stall prevention operation level for restart
Pr.299 Rotation direction detection selection at restarting
Pr.611 Acceleration time at a restart
The inverter can be restarted without stopping the motor under V/F
control and General-purpose magnetic flux vector control in the
following cases:

when power comes back on after an instantaneous power failure

when motor is coasting at start
For the operation under IPM motor control, refer to the next page.
Pr. Setting
Number Range
0 (initial value), The motor starts at the starting frequency
1 when MRS (X10) turns ON then OFF
30
Restart operation is performed when MRS
2
(X10) turns ON then OFF
1.5K or lower ............................ 1s
2.2K to 7.5K or higher............... 2s
0
11K, 15K ................................... 3s
The above times are coasting time.
57
Set the waiting time for inverter-triggered
0.1 to 5s restart after an instantaneous power
failure.
9999
No restart
(initial value)
58 0 to 60s Set a voltage starting time at restart.
Frequency search only performed at the
0
first start
Reduced voltage start only performed at
1 (initial value)
162 the first start (no frequency search)
10 Frequency search at every start
Reduced voltage start at every start (no
11
frequency search)
Consider the rated inverter current as
165 0 to 150% 100% and set the stall prevention
operation level during restart operation.
0 (initial value) Without rotation direction detection
1 With rotation direction detection
When Pr. 78 =0, the rotation direction is
299
detected.
9999
When Pr. 78 =1,2, the rotation direction is
not detected.
Set the acceleration time that takes to
0 to 3600s reach Pr. 20 Acceleration/deceleration
611 reference frequency setting at a restart.
9999 Acceleration time for restart is the normal
(initial value) acceleration time (e.g. Pr. 7).
When setting parameters, refer to the instruction manual (applied) and understand instructions.
GP GP GP
V/F V/F V/F MFVC MFVC MFVC
Pr.57 Restart coasting time
Description

When = "1 (initial value) or 11", automatic restart operation is
Pr. 162
performed in a reduced voltage system, where the voltage is
gradually risen with the output frequency unchanged from prior to an
instantaneous power failure independently of the coasting speed of
the motor.
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 setting
∗ The output shut off timing differs according to the load condition.
 When "0 or 10" is set in Pr. 162, the inverter smoothly starts after
detecting the motor speed upon power restoration. (The motor
capacity should be equal to or one rank lower than the inverter
capacity)
When using the frequency search, perform offline auto tuning. Also,
there is a limit to the wiring length. (Refer to page 73)

Even when the motor is rotating in the opposite direction, the
inverter can be restarted smoothly as the direction of rotation is
detected. (You can select whether to make rotation direction
detection or not with Pr.299 Rotation direction detection selection at
restarting. )
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 Speed
+
(Pr. 57 )
detection time
∗ The output shut off timing differs
according to the load condition.
 Restart operation after turning MRS (X10) signal ON then OFF using
Pr. 30 can be selected as in the table below. This function is used
when the high power factor converter (FR-HC2) is used and the
automatic restart after instantaneous power failure is selected. (Refer
to page 36)
∗
Restart cushion time
(Pr. 58 setting)
Restart cushion time
(Pr. 58 setting)
Acceleration time
at a restart
(Pr. 611 setting)
39