Mitsubishi Electric 800 Series Instruction Manual (Function page 445

 Setting for the automatic restart after instantaneous power failure
operation (Pr.162)
• The Pr.162 settings and the instantaneous power failure automatic restart operation under each operation mode are as
shown in the following table.
Restart
Pr.162 setting
operation
0 (initial value) At first start
1 At first start
10 At every start
11 At every start
 Restart operation with frequency search (Pr.162 ="0 or 10", Pr.299)
• When Pr.162 = "0 (initial value) or 10", the motor speed is detected at a power restoration so that the motor can re-start
smoothly.
• The encoder also detects the rotation direction so that the inverter can re-start smoothly even during the reverse rotation.
• Whether or not to detect the rotation direction can be selected by Pr.299 Rotation direction detection selection at
restarting. If the motor capacity is different from the inverter capacity, set Pr.299 = "0" (no rotation direction detection).
• When the rotation direction is detected, the following operation is performed according to Pr.78 Reverse rotation
prevention selection setting.
Pr.299 setting
9999
0 (initial value)
1
○: With rotation direction detection ×: Without rotation direction detection
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)
Speed
Coasting
detection
+
time (Pr.57)
time
* The output shut off timing differs
according to the load condition.
444
16. (A) Application Parameters
16.7 Automatic restart after instantaneous power failure / flying start with an induction motor
V/F control,
Advanced magnetic flux vector control
Without encoder
Frequency search
Reduced voltage start
Frequency search
Reduced voltage start
Pr.78 setting
0 1
○ × ×
× × ×
○ ○ ○
Instantaneous (power failure) time
*
Restart cushion
time (Pr.58 setting)
Acceleration time
at a restart
(Pr.611 setting)
With encoder
Frequency search
Encoder detection
frequency search
Frequency search
Frequency search
Encoder detection
frequency search
2
Real sensorless vector control
Power supply
(R/L1, S/L2,
T/L3)
Motor speed N
(r/min)
Inverter output
frequency f(Hz)
output voltage
E(V)
Coasting
+
time (Pr.57)
* The output shut off timing differs
according to the load condition.
Real sensorless
Vector control
vector control
Encoder detection
frequency search
Instantaneous (power failure) time
*
Speed
Acceleration time
detection
time
at a restart
(Pr.611 setting)