Vacon NX ACTIVE FRONT END II, Applications Manual

Page: 41 / 94

Arfiff05 Standard AFE-II vacon • 41
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
7.2 Reference Handling
P2.2.1 DC Voltage Reference [#,## %] ID1462
This parameter sets the DC Voltage reference in % of Nominal DC voltage (Nominal DC
voltage = 1,35 * Grid Nominal Voltage). The DC Voltage will be maintained at this level
when regenerative unit is running. Ramp rate for reference is 5 % / 100 ms.
NOTE! DC-link voltage should not exceed the following values:
•
797 Vdc for 500V unit
•
1099 Vdc for 690V unit
DC Voltage is limited to these values regardless of reference.
In fieldbus control DC Voltage Reference can be given in FBSpeedReference signal. If
FBSpeedReference is below 50,00 % keypad reference is used instead but minimum is
always limited to 105,00 %.
P2.2.2 DC Droop ID620
When AFEs are used in parallel, drooping can be used for current balancing. The DCV
voltage reference drooping is set as % of active current reference.
E.g. if drooping is 3.00% and active current is 50% then DC voltage reference is reduced
1,5%.
P2.2.3
Reactive Current Reference ID1459
This parameter sets the reference for the reactive current in % of the rated current. This
can be used for power factor correction of AFE system or reactive power compensation.
Positive value makes inductive power to the grid
Negative value makes capacitive power to the grid.
P2.2.4 DC Reference Offset
Offset for DC Reference, used to balance parallel unit active current while using same
DC Reference P2.2.1. in all units.