Regeneration Avoidance Function - Mitsubishi Electric FR-E700 Instruction Manual

Special operation
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.
Pr. No. Name
Regeneration avoidance
882
operation selection
Regeneration avoidance
883
operation level
Regeneration avoidance
885
compensation frequency
limit value
Regeneration avoidance
886
voltage gain
Regeneration avoidance
665
frequency gain
The above parameters can be set when Pr. 160 "User group read selection" = 0.
6 - 314
Setting
Initial Value Description
Range
0 Regeneration avoidance function invalid
1 Regeneration avoidance function is always valid
0
Regeneration avoidance function is valid only
2
during a constant speed operation
200 V Set the bus voltage level at which regeneration
400 V
class avoidance operates. When the bus voltage level is
set to low, overvoltage error will be less apt to
300–800 V
occur. However, the actual deceleration time
400 V
780 V
increases. The set value must be higher than the
class
power supply voltage x 2.
Set the limit value of frequency which rises at
0–10 Hz
activation of regeneration avoidance function.
6 Hz
9999 Frequency limit invalid
Responsiveness at activation of regeneration
100% 0–200%
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
100% 0–200%
decreasing the Pr. 886 setting, set a smaller value
in Pr. 665.
Parameter
Parameters referred to
1 Maximum
frequency
8 Deceleration time
22 Stall prevention
operation level
Refer to
Section
6.4.1
6.7.1
6.3.5