Mitsubishi Electric FR-XC-11K, Instruction Manual

Page: 91 / 186

Parameter details
90
PARAMETERS
3.5.6
DC voltage control (Pr.22, Pr.23, Pr.80, and Pr.81)
 Adjusting DC voltage fluctuation (Pr.80 and 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 makes the operation unstable.
 Setting the current limit level (Pr.22 and Pr.23)
• Limit the output current not to exceed the specified value.
Set the current limit level by using Pr.22 .
Current limit level at the regenerative operation can be individually set by setting a value other than "9999" to Pr.23
Set the current limits as a percentage (set current limit ratios) with 100 being equal to the converter rated current in Pr.22
and Pr.23 .
• The OL signal is output when output currents are limited by the current limit level (when the current limit function is active).
NOTE
• When the output current reaches the current limit level, DC voltage decreases during power driving or increases during
regeneration.
Use the following parameters to control DC voltage output from the converter with harmonic suppression enabled as
commanded.
Operation can be stable enough with these parameters in the initial setting, however, some adjustments may be
required if voltage vibration occurs depending on the power supply condition.
Pr. Name
Initial
value Setting
range
Description
22 Current limit level
150% 0 to 190%
Set the current limit where the current limit
operation starts (during power driving).
23
Current limit level
(regenerative)
9999
0 to 190%
Set the current limit where the current limit
operation starts (during regenerative driving).
9999 The same setting in Pr.22 is applied.
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.