Mitsubishi Electric FR-D720S SC EC Instruction Manual page 174

Parameter overview
Parameter
Func-
Name
tion
Regeneration
882 avoidance operation
selection
Regeneration
883 avoidance operation
level
Regeneration avoid-
885 ance compensation
frequency limit value
Regeneration avoid-
886
ance voltage gain
Regeneration avoid-
665
ance frequency gain
Tab. 6-1: Parameter overview (24)
6 - 24
Incre- Initial Setting
ments value range
0
1
1 0
2
400V/
0.1V 300–800V
780V *
0–10Hz
0.01Hz 6Hz
9999
0.1% 100% 0–200%
0.1% 100% 0–200%
Description
Regeneration avoidance function
invalid
Regeneration avoidance function
is always valid
Regeneration avoidance function
is valid only during a constant
speed operation
Set the bus voltage level at which
regeneration avoidance operates.
When the bus voltage level is set
to low, overvoltage error will be
less apt to occur. However, the
actual deceleration time increases.
The set value must be higher
than the "power supply
voltage ×
2 .
* The initial value differs according
to the voltage class:
200V/400V
Set the limit value of frequency
which rises at activation of regen-
eration avoidance function.
Frequency limit invalid
Adjusts responsiveness at activa-
tion of regeneration avoidance. A
larger setting of Pr. 886 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 set-
ting.When vibration is not sup-
pressed by decreasing the Pr. 886
setting, set a smaller value in
Pr. 665.
Parameter
All
Para- Para-
Para-
meter meter
meter
copy clear
clear
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to
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—: disabled
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6-267
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