Mitsubishi Electric fr-e700 series, Instruction Manual

Page: 468 / 608

Special operation Parameter
6 - 314
6.20.4 Regeneration avoidance function (Pr. 665, Pr. 882, Pr. 883, Pr. 885, Pr. 886)
This function detects a regeneration status and increases the frequency to avoid the regeneration
status.
Possible to avoid regeneration by automatically increasing the frequency and continue operation if
the fan happens to rotate faster than the set speed due to the effect of another fan in the same duct.
The above parameters can be set when Pr. 160 "User group read selection" = 0.
Pr. No. Name Initial Value
Setting
Range
Description Parameters referred to
Refer to
Section
882
Regeneration avoidance
operation selection
0
0 Regeneration avoidance function invalid 1
8
22
Maximum
frequency
Deceleration time
Stall prevention
operation level 6.4.1
6.7.1
6.3.5
1 Regeneration avoidance function is always valid
2
Regeneration avoidance function is valid only
during a constant speed operation
883
Regeneration avoidance
operation level
200 V
class
400 V
300–800 V
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 x 2.
400 V
class
780 V
885
Regeneration avoidance
compensation frequency
limit value
6 Hz
0–10 Hz
Set the limit value of frequency which rises at
activation of regeneration avoidance function.
9999 Frequency limit invalid
886
Regeneration avoidance
voltage gain
100% 0–200%
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 vibration is not suppressed by
decreasing the Pr. 886 setting, set a smaller value
in Pr. 665.
665
Regeneration avoidance
frequency gain
100% 0–200%