Mitsubishi Electric FR-A700 Technical Manual page 307

[Pr. ] Name
Regeneration
avoidance
885 compensation
frequency limit
value
Regeneration
886 avoidance voltage
gain
Regeneration
665 avoidance
frequency gain
(1) Operation [Pr. 882, 883]
When the regeneration status is serious, the DC bus
voltage rises and an overvoltage fault (E. OV1 to 3)
may occur. When this bus voltage rise is detected
and the bus voltage level reaches or exceeds [Pr.
883], increasing the frequency will avoid the
regeneration status.
The [Pr. 883] setting should be kept higher than the
DC bus voltage level at a stop. Otherwise
regeneration avoidance function always activates.
Whether regeneration avoidance operation is always
activated ([Pr. 882 = 1]) or activated only at a constant
speed ([Pr. 882 = 2]) can be selected.
While overvoltage stall (
during deceleration and stops the decrease in output
frequency, the regeneration avoidance function is
always ON ([Pr. 882 = 1]) or activated only during a
constant speed ([Pr. 882 = 2]) and increases the
frequency according to the regeneration amount.
When regeneration avoidance function is always ON
[Pr. 882 = 1] is selected, overvoltage stall prevention
during deceleration is not operated and regeneration
avoidance operation is performed.
When regeneration avoidance operation is activated,
(overvoltage stall) appears and the OL signal
is output. Use [Pr. 156, Pr. 157] to select OL signal ON/
OFF and output timing (refer to page 338).
When regeneration
performed, stall prevention is also activated at the
same time.
When using the regeneration unit (FR-BU2, FR-BU,
MT-BU5, FR-CV, FR-HC, MT-HC) and brake resistor
(FR-ABR etc.), set [Pr. 882 = 0] (initial value)"
(regeneration avoidance function invalid).
Under vector control operation of
noise may be generated from the motor during
deceleration when using regeneration avoidance
function . To prevent this, make gain adjustment, e.g.
by performing easy gain tuning. (Refer to page 286)
Setting
Initial Value
Range
0 to 10Hz
6Hz
9999
0 to
100%
200%
0 to
100%
200%
) is activated only
avoidance operation is
, unusual
A700
Description
Set the limit value of frequency which rises at
activation of regeneration avoidance function.
Frequency limit invalid
Adjusts responsiveness at activation of regeneration
avoidance. A larger setting will improve
responsiveness to the bus voltage change. However,
the output frequency could become unstable. When
the load inertia of the motor is large, decrease the [Pr.
886] setting. When vibration is not suppressed by
decreasing the [Pr. 886] setting, set a smaller value in
[Pr. 665].
Regeneration avoidance operation
example for acceleration
[Pr. 883]
During regeneration
avoidance function operation
Regeneration avoidance operation
example for constant speed
[ Pr. 883
During regeneration
avoidance function operation
Regeneration avoidance operation
example for deceleration
[
Pr. 883
During regeneration
avoidance function operation
341
PARAMETER
Available Inverters
A700 F700 E700 D700
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