Mitsubishi FR-A800

(A) Application parameters
530
PARAMETERS
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 below.
Restart operation with frequency search (Pr.162 = "0, 3, 10, 13", Pr.299)
• When Pr.162 = "0 (initial value, 3, 10, 13", 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 motor 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 the Pr.78 Reverse rotation
prevention selection setting.
: With rotation direction detection : Without rotation direction detection
• By setting "3, 13" in Pr.162, the restart can be made smoother with even less impact than when "0, 10" is set in Pr.162.
When the inverter is restarted with "3, 13" set to Pr.162, offline auto tuning is required. (For details on offline auto tuning of
Advanced magnetic flux vector control and Real sensorless vector control, refer to page 442, and for details on offline auto
tuning of V/F control, refer to page 537.)
Pr.162 setting
Restart
operation
V/F control,
Advanced magnetic flux vector control
Real
sensorless
vector control
Vector
control
PM
sensorless
vector
control
Without encoder With encoder
0 (initial value) At first start Frequency search Frequency search
Frequency search
(reduced impact
restart)
Encoder
detection
frequency
search
Frequency
search for PM
motor
(Refer to page
534)
1 At first start Reduced voltage start Reduced voltage start
2 At first start Frequency search
Encoder detection
frequency search
3 At first start
Frequency search
(reduced impact restart)
Frequency search
(reduced impact restart)
10 At every start Frequency search Frequency search
11 At every start Reduced voltage start Reduced voltage start
12 At every start Frequency search
Encoder detection
frequency search
13 At every start
Frequency search
(reduced impact restart)
Frequency search
(reduced impact restart)
Pr.299 setting
Pr.78 setting
0 1 2
9999  
0 (initial value) 
1 
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)
Restart cushion
time (Pr.58 setting)
*
* The output shut off timing differs
according to the load condition.
Instantaneous (power failure) time
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)
Speed
detection
time
+
Acceleration time
at a restart
(Pr.611 setting)
*
V/F control, Advanced magnetic flux vector control Real sensorless vector control
* The output shut off timing differs
according to the load condition.