Mitsubishi Electric FR-A700 Instruction Manual page 241

Parameter
Parameter
Func-
Name
tion
— 874 Refer to Pr. 22
875 Fault definition
877
— – Refer to Pr. 828
881
Regeneration avoid-
882 ance operation selec-
tion
Regeneration avoid-
883
ance operation level
Regeneration avoid-
884 ance at deceleration
detection sensitivity
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 (61)
FR-A700 EC
Incre- Initial Setting
ments Value Range
0
1 0
1
0
1 0 1
2
0.1V 760V 300–800V
0
1 0
1–5
0–10Hz
0.01Hz 6Hz
9999
0.1% 100% 0–200%
0.1% 100% 0–200%
Description
At occurrence of any alarm, the
base circuit is shut off immedi-
ately. At this time, the alarm output
also turns on.
At occurrence of external thermal
operation (OHT), electronic ther-
mal relay function (THM) or PTC
thermistor operation (PTC) alarm,
the motor is decelerated to a stop
and the base circuit is shut off. At
occurrence of an alarm other than
OHT, THM and PTC, the base cir-
cuit is shut off immediately. Same
operation as when "0" is set is per-
formed under position control.
Regeneration avoidance function
invalid
Regeneration avoidance function
is always valid
Regeneration avoidance function
is valid only at constant speed
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 .
Regeneration avoidance by bus
voltage change ratio is invalid
Set sensitivity to detect the bus
voltage change.
1 (low) → 5 (high)
Set the limit value of frequency
which rises at activation of regen-
eration avoidance function.
Frequency limit invalid
Adjust responsiveness at activa-
tion of regeneration avoidance.
Setting a larger value in 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 setting. When vibration is
not suppressed by decreasing the
Pr. 886 setting, set a smaller value
in Pr. 665.
Parameter overview
All
Para- Para-
para-
meter meter
meter
copy clear
Refer
clear
to
page
✔: enabled
—: disabled
✔ ✔ ✔
6-358
✔ ✔ ✔
✔ ✔ ✔
✔ ✔ ✔
6-523
✔ ✔ ✔
✔ ✔ ✔
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