# Dc Voltage Control (pr. 22 To Pr. 24, Pr. 80, Pr. 81) - Mitsubishi Electric FR-HC2-7.5K Instruction Manual

3.4.6

## DC voltage control (Pr. 22 to Pr. 24, Pr. 80, Pr. 81)

DC voltage of the converter can be controlled to be as commanded.
Operation should be stable in the initial setting, but adjust the following parameters when voltage fluctuation occurs due
to the environment such as a voltage condition.
Parameter
Name
Number
22
Current limit level
23
Current limit level (regenerative)
24
OL signal output timer
Voltage control proportional
80
gain
81
Voltage control integral gain
(1)
Adjustment for the DC voltage fluctuation (Pr. 80, Pr. 81)
 Adjust the fluctuation range of the DC voltage by setting Pr. 80.
Increasing the setting value reduces the DC voltage fluctuation caused by external disturbance.
 Adjust the recovery time to the commanded value at a fluctuation of DC voltage by setting Pr. 81.
Increasing the setting value shortens the recovery time from the DC voltage fluctuation caused by external disturbance.
NOTE
 Setting Pr. 80 too large makes the operation unstable.
 Setting only Pr. 81 too large makes the operation unstable.
(2)
Setting the current limit level (Pr. 22 to Pr. 24)
This function limits the output current of the converter at a specified value.
Set the current limit level to Pr. 22. Current limit level at the regenerative operation can be individually set by setting a
value other than "9999" to Pr. 23
For Pr. 22 and Pr. 23, set current limits in ratios against the converter rated current.
OL signal is output when an output current is limited by the current limit level (when the current limit function is active).
For Pr. 24, set a time from when the command current reaches the current limit level until OL signal is output.
Pr. 22
Pr. 24
OL signal
NOTE
 When the output current reaches the current limit level, DC voltage decreases during power driving, and DC voltage
increases during regeneration.
Initial
Value
150%
9999
0s
0 to 25s, 9999
100%
0 to 1000%
100%
0 to 1000%
Pr. 24
ON
Description of parameters
Setting
Range
Set the current level where the current limit operation starts
0 to 220%
(during power driving).
Set the current level where the current limit operation starts
0 to 220%
(during regenerative driving).
9999
Same as Pr. 22
Set the OL signal output start time at the activation of
current limit operation.
Set the proportional gain for the voltage control.
Increasing the setting value reduces the DC voltage
fluctuation caused by external disturbance.
Set the integral gain for the voltage control.
Increasing the setting value shortens the recovery time from
the DC voltage fluctuation caused by external disturbance.
Pr. 24
Description
Output
current
time
ON
3
79

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