Mitsubishi Electric FR-A700 Technical Manual page 308

(2) Regeneration status detection sensitivity
[Pr. 884] (*Not available for
As the regeneration avoidance function cannot
respond to an abrupt voltage change by detection of
the bus voltage level, the ratio of bus voltage change
is detected to stop deceleration if the bus voltage is
less than [Pr. 883 Regeneration avoidance operation
level].
Set that detectable bus voltage change ratio to [Pr.
884] as detection sensitivity.
Increasing the setting raises the detection sensitivity.
Too small setting (low detection sensitivity) will
disable detection, and too large setting will turn ON
the regeneration avoidance function if the bus
voltage is varied by an input power change, etc.
(3) Limit of regeneration avoidance operation
frequency [Pr. 885]
The output frequency compensated for (increased
by) the regeneration avoidance function can be
limited.
The frequency is limited to the output frequency
(frequency prior to regeneration avoidance operation)
+ [Pr. 885 Regeneration avoidance compensation
frequency limit value] during acceleration or constant
speed.
If the regeneration avoidance frequency exceeds the
limit value during deceleration, the limit value is held
until the output frequency falls to 1/2 of [Pr. 885].
When the regeneration avoidance frequency has
reached [Pr. 1 Maximum frequency], it is limited to the
maximum frequency.
When [Pr. 885 = 9999], the frequency setting is
invalid.
[Pr.885]
.)
E700 D700
Limit level
Output frequency (Hz)
[Pr.885]/2
Time
(4) Regeneration avoidance function adjustment
[Pr. 665 * , 886] (*Not available for
If the frequency
regeneration avoidance operation, decrease the
setting of [Pr. 886 Regeneration avoidance voltage gain].
On the contrary, if sudden regeneration causes an
overvoltage alarm, increase the setting.
When the load inertia of the motor is large, decrease
the [Pr. 886] setting.
suppressed by decreasing the [Pr. 886] setting, set a
smaller value in [Pr. 665 Regeneration avoidance
frequency gain] .
342
PARAMETER
.)
F700
becomes unstable during
When vibration is not