Mitsubishi Electric FR-A700 EC, Instruction Manual

Page: 526 / 826

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