Mitsubishi Electric FR-F820-00046, Instruction Manual

Page: 606 / 940

(A) Application parameters Parameters
5 - 434
Outline of operation of deceleration stop at a power failure
●
If an undervoltage or power failure occurs, the output frequency is turned OFF only for the
frequency set to Pr. 262 "Subtracted frequency at deceleration start".
●
The motor decelerates for the time set to Pr. 264 "Power-failure deceleration time 1". (The decel-
eration time setting is the time it takes for the motor to stop from Pr. 20 "Acceleration/deceleration
reference frequency".)
●
Change the deceleration time (slope) to the stop using Pr. 265 "Power-failure deceleration time"
2 when the frequency is too low to obtain the regenerative energy or in other instances.
Action setting at undervoltage and power failure
●
Set Pr. 261 to select the action at an undervoltage and power failure.
I001173E
Fig. 5-214: Parameters for stop selection at power failure
Pr. 261
Setting
Action at undervoltage
and power failure
Power restoration
during deceleration at
occurrence of power
failure
Deceleration stop time
Undervoltage avoidance
function
0 Coasts to stop Coasts to stop — —
1
Deceleration stop
Deceleration stop
According to Pr. 262 to
Pr. 266 setting
Not used
2 Re-acceleration Not used
11 Deceleration stop With
12 Re-acceleration With
21 Deceleration stop
Automatic adjustment of
deceleration time
Not used
22 Re-acceleration Not used
Tab. 5-211: Setting of Pr. 261
Output
frequency
Power-failure
deceleration
time switchover
frequency
Pr. 266
Time
Power supply
Subtracted
frequency at
deceleration
start
Pr. 262
Pr. 264
Power-failure
deceleration time 1
Pr. 265
Power-failure
deceleration
time 2