Regeneration Avoidance Function (Pr. 665, Pr. 882 To Pr. 886) - Mitsubishi Electric FR-F720P-0.75K to 110K Instruction Manual

Fr-f700p series
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4.21.3 Regeneration avoidance function (Pr. 665, Pr. 882 to 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.
Parameter
Name
Number
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
665
avoidance frequency
gain
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 201)
...............Specifications differ according to the date assembled. Refer to page 378 to check the SERIAL number.
*1
Performing IPM parameter initialization changes the settings. (Refer to page 80)
(1) What is regeneration avoidance function? (Pr. 882, Pr. 883)
⋅ When the regeneration status is serious, the DC bus voltage rises and an overvoltage fault (E. OV ) may occur.
When this bus voltage rise is detected and the bus voltage level reaches or exceeds Pr. 883, increasing the
frequency avoids the regeneration status.
⋅ The regeneration avoidance operation, you can select whether it is always activated or activated only a constant speed.
Regeneration avoidance operation
example for acceleration
Pr.883
During regeneration
avoidance function operation
⋅ Setting Pr. 882 to "1, 2" validates the regeneration avoidance function.
REMARKS
⋅ The inclination of the frequency increased or decreased by the regeneration avoidance function changes depending on the
regeneration status.
⋅ The DC bus voltage of the inverter is normally about
When the input voltage is 220VAC, the bus voltage is about 311VDC.
When the input voltage is 440VAC, the bus voltage is about 622VDC.
However, it varies with the input power waveform.
⋅ The Pr. 883 setting should be kept higher than the DC bus voltage level. Otherwise, the regeneration avoidance function is always ON
even in the non-regeneration status and the frequency increases.
⋅ While overvoltage stall (
avoidance function is always ON (Pr. 882 = 1) or activated only during a constant speed (Pr. 882 = 2) and increases the
frequency according to the regeneration amount.
Setting
Initial Value
Range
0
200V
380VDC
class
300 to 800V
400V
760VDC
class
0
0 to 30Hz
6Hz
*1
100%
0 to 200%
100%
0 to 200%
Regeneration avoidance operation
example for constant speed
Pr.883
Time
During regeneration
avoidance function operation
Time
times greater than the input voltage.
2
) is activated only during deceleration and stops the decrease in output frequency, the regeneration
Special operation and frequency control
0
Regeneration avoidance function invalid
1
Regeneration avoidance function valid
Regeneration avoidance function is valid only during a
2
constant speed operation
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 ×
Regeneration avoidance by bus voltage change ratio is
0
invalid
Set sensitivity to detect the bus voltage change ratio
1 to 5
Setting
Detection sensitivity low
Set the limit value of frequency which rises at activation
of regeneration avoidance function.
9999
Frequency limit invalid
Adjust 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.
Time
Time
Description
1
5
high
Regeneration avoidance operation
example for deceleration
Pr.883
During regeneration
avoidance function operation
.
2
Time
4
Time
279

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