Power Failure-Time Deceleration-To-Stop Function - Mitsubishi Electric FR-A700 Instruction Manual

Operation selection at power failure
6.16.2 Power failure-time deceleration-to-stop function (Pr. 261 to Pr. 266,
Pr. 294)
When a power failure or under voltage occurs, the inverter can be decelerated to a stop or can
be decelerated and re-accelerated to the set frequency.
Pr.
Name
No.
Power failure stop
261
selection
Subtracted frequency at
262
deceleration start
Subtraction starting
263
frequency
Power-failure
264
deceleration time 1
Power-failure
265
deceleration time 2
Power failure
266
deceleration time switch-
over frequency
UV avoidance voltage
294
gain
When the setting of Pr. 21 "Acceleration/deceleration time increments" is "0" (initial value),
the setting range is "0 to 3600s" and the setting increments are "0.1s", and when the setting
is "1", the setting range is "0 to 360s" and the setting increments are "0.01s"
6 - 346
Initial Setting
Description
Value Range
Coasting to stop when under voltage or
0 power failure occurs, the inverter output
is shut off.
Without under
1 voltage avoid-
ance
With under
11 voltage avoid-
0
ance
Without under
2 voltage avoid-
ance
With under
12 voltage avoid-
ance
Normally operation can be performed
with the initial value unchanged. But
3Hz 0–20Hz adjust the frequency according to the
magnitude of the load specifications
(moment of inertia, torque).
When output frequency ≥ Pr. 263:
Decelerate from the speed obtained from
0–120Hz output frequency minus Pr. 262.
When output frequency < Pr. 263:
50Hz
Decelerate from output frequency
Decelerate from the speed obtained from
9999
output frequency minus Pr. 262.
0–3600/
Set a deceleration slope down to the
5s
360s frequency set in Pr. 266.
0–3600/
Set a deceleration slope below the
frequency set in Pr. 266.
360s
9999
9999 Same slope as in Pr. 264
Set the frequency at which the decelera-
50Hz 0–400Hz tion slope is switched from the Pr. 264
setting to the Pr. 265 setting.
Adjust the response level during under-
voltage avoidance operation. A larger set-
ting will improve responsiveness to the
100% 0–200%
bus voltage change. Since the regenera-
tion amount is large when the inertia is
large, decrease the setting value.
Parameters referred to
When under voltage or a
power failure occurs,
the inverter can be
decelerated to a stop.
When under voltage or a
power failure occurs,
the inverter can be
190–196
decelerated to a stop. If
power is restored during
a power failure, the
inverter accelerates
again.
Parameter
Refer to
Section
12 DC injection brake 6.13.1
operation voltage
20 Acceleration/ 6.11.1
deceleration
reference
frequency
21 Acceleration/ 6.11.1
deceleration time
increments
30 Regenerative 6.13.2
function selection
57 Restart coasting 6.16.1
time
Output terminal 6.14.5
function selection
872 Input phase failure 6.17.3
protection selec-
tion