Limit Settings; Current Limits; Power Limits; Frequency Limits - Vacon NX ACTIVE FRONT END II Applications Manual

Arfiff05 Standard AFE-II
7.5

Limit Settings

7.5.1 Current limits

P2.5.1.1 Current Limit
Sets the current limit for the regenerative supply unit. Set this to correspond to the
maximum required load or peak overload for the unit, bearing in mind that the load
might consist of several motor drive units.
Maximum value 2 * IH depends on the unit size.
P2.5.1.2 Output Active Current Limit
This parameter sets the active current limit for the generator side operation of the
regenerative unit. 100.0% is equal to nominal current. Generator Side operations is when
power flows from DC side to AC side. Setting too low value may lead to over voltage fault
even on situation when power is not mend to regenerate to grid side.
P2.5.1.3 Input Active Current Limit
This parameter sets the active current limit for the motor side operation of the
regenerative unit. 100.0% is equal to nominal current. Motoring Side operations is when
power flows from AC side to DC side.

7.5.2 Power Limits

P2.5.2.1 Output Power Limit
This parameter sets the power limit for the generator side operation of the regenerative
unit. 100.0% is equal to nominal current at nominal voltage. Generator Side operations is
when power flows from DC side to AC side. Setting too low value may lead to over voltage
fault even on situation when power is not mend to regenerate to grid side.
P2.5.2.2 Input Power Limit
This parameter sets the power limit for the motor side operation of the regenerative unit.
100.0% is equal to nominal current at nominal voltage. Motoring Side operations is when
power flows from AC side to DC side.

7.5.3 Frequency limits

P2.5.3.1 Line Low Frequency Trip Limit
If the drive output frequency goes below this level, the drive will trip to a line synch fault
(F10). Use this limit as a final protection function for the grid or generator.
.
P2.5.3.2 Line High Frequency Trip Limit
If the drive output frequency goes above this level, the drive will trip to a line synch fault
(F10). Use this limit as a final protection function for the grid or generator.
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
[A] ID107
[%] ID1290
[%] ID1289
ID1288
ID1287
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