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3
Description of parameters
3.4.6
DC voltage control (Pr. 22 to Pr. 24, Pr. 80, Pr. 81)
(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.
(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.
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
Number
Name
Initial
Value
Setting
Range
Description
22
Current limit level
150%
0 to 220%
Set the current level where the current limit operation starts
(during power driving).
23
Current limit level (regenerative)
9999
0 to 220%
Set the current level where the current limit operation starts
(during regenerative driving).
9999
Same as
Pr. 22
24
OL signal output timer
0s
0 to 25s, 9999
Set the OL signal output start time at the activation of
current limit operation.
80
Voltage control proportional
gain
100%
0 to 1000%
Set the proportional gain for the voltage control.
Increasing the setting value reduces the DC voltage
fluctuation caused by external disturbance.
81
Voltage control integral gain
100%
0 to 1000%
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.
NOTE
Setting
Pr. 80
too large makes the operation unstable.
Setting only
Pr. 81
too large makes the operation unstable.
NOTE
When the output current reaches the current limit level, DC voltage decreases during power driving, and DC voltage
increases during regeneration.
Pr. 24
Pr. 24
Pr. 24
ON
ON
OL signal
Pr. 22
Current
time
Output
current
HC2.book 79 ページ ２０１２年１１月１９日 月曜日 午前１０時５２分
