Regeneration Avoidance Function (Pr. 882 To Pr. 886) - Mitsubishi Electric FR-A700 Instruction Manual

Parameter
6.24.8

Regeneration avoidance function (Pr. 882 to Pr. 886)

This function detects a regeneration status and increases the frequency to avoid the regener-
ation status.
Possible to avoid regeneration by automatically increasing the frequency and continue opera-
tion if the fan happens to rotate faster than the set speed due to the effect of another fan in the
same duct.
Pr. No. Name
Regeneration
882
avoidance operation
selection
Regeneration
883
avoidance operation
level
Regeneration
avoidance at
884
deceleration detection
sensitivity
Regeneration
avoidance
885
compensation
frequency limit value
Regeneration
886
avoidance voltage
gain
Regeneration avoid-
665
ance frequency gain
FR-A700 EC
Initial Setting
Description
Value Range
Regeneration avoidance function
0
invalid
1 Regeneration avoidance function valid
0
Regeneration avoidance function is
2 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, over voltage error will be less apt
to occur. However, the actual decelera-
760V
tion time increases. The set value
300–800V
785VDC*
must be higher than the
power supply voltage
* The initial value differs according to
the inverter capacity. (01800 or
less/02160 or more)
Regeneration avoidance by bus volt-
0
age change ratio is invalid
0
Set sensitivity to detect the bus volt-
1–5 age change
1 (low) → 5 (high)
Set the limit value of frequency which
0–10Hz rises at activation of regeneration
6Hz
avoidance function.
9999 Frequency limit invalid
Adjust responsiveness at activation of
100% 0–200% regeneration avoidance. A larger set-
ting will improve responsiveness to
the bus voltage change. However, the
output frequency could become
unstable.
When the load inertia of the motor is
100% 0–200%
large, decrease the Pr. 886 setting.
When vibration is not suppressed by
decreasing the Pr. 886 setting, set a
smaller value in Pr. 665.
Parameters referred to
1
8
22
×
2 .
Special operation
Refer to
Section
Maximum 6.8.1
frequency
Deceleration time 6.11.1
Stall prevention 6.7.4
operation level
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