The line-side and motor-side converters have their own control programs. The parameters
of both programs can be viewed and changed using a control panel.
￭ DC voltage boost function
The drive can boost their DC link voltage. In other words, it can increase the operating
voltage of the DC link from its default value.
To take the DC voltage boost function in use:
1.
adjust the user DC voltage reference value (94.22) and
2.
select the user-defined reference (94.22) as the source for the drive DC voltage
reference (94.21).
Benefits of the DC voltage boost function are:
• possibility to supply nominal voltage to the motor even when the supply voltage of
the drive is below the motor nominal voltage level
• compensation of voltage drop due to output filter, motor cable or input supply cables
• increased motor torque in the field weakening area (ie, when the drive operates the
motor in the speed range above the motor nominal speed)
• possibility to use a motor with higher nominal voltage than the actual supply voltage
of the drive. Example: A drive that is connected to 415 V can supply 460 V to a 460 V
motor.
For more information, see ACS880-11, ACS880-31, ACS880-14, ACS880-34,
ACS880-17, ACS880-37 drives product note on DC voltage boost (3AXD50000691838
[English]).
￭ DC connection
You can connect drive frames R3 and R6 to a common DC system, see Common DC
systems with ACS880-01, -04, -11, -14, -31 and -34 drives application guide
(3AUA0000127818 [English]).
Operation principle and hardware description 29
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