Regeneration Avoidance Function (Pr. 665, Pr. 882, Pr. 883, Pr. 885, Pr. 886) - 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 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 opera-
tion selection
Regeneration
883
avoidance opera-
tion level
Regeneration
avoidance
885
compensation
frequency limit
value
Regeneration
886
avoidance voltage
gain
Regeneration avoid-
665
ance frequency gain
The above parameters can be set when Pr. 160 "User group read selection" = 0.
6 - 292
Initial Setting
Description
Value Range
Regeneration avoidance function
0
invalid
Regeneration avoidance function is
1
0 always valid
Regeneration avoidance function is
2 valid only during a constant speed
operation
Set the bus voltage level at which
200V
400V
class regeneration avoidance operates.
When the bus voltage level is set to
low, over voltage error will be less apt
300–800V
to occur. However, the actual decelera-
400V
780V
tion time increases. The set value
class
must be higher than the
power supply voltage
Set the limit value of frequency which
0–10Hz rises at activation of regeneration
6 Hz avoidance function.
9999 Frequency limit invalid
Responsiveness at activation of regen-
100% 0–200% eration 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.
Parameters referred to
1
8
22
×
2 .
Parameter
Refer to
Section
Maximum 6.4.1
frequency
Deceleration time 6.7.1
Stall prevention 6.3.5
operation level