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Performance RFC mode

Menu 4

Unidrive SP Advanced User Guide 107

Issue Number: 10 www.controltechniques.com

The thermal protection system can be used in regen mode to protect the input inductors. The rated current (Pr 5.07) should be set to the rated current

for the inductors.

The thermal model temperature accumulator is reset to zero at power-up and accumulates the temperature of the motor while the drive remains

powered-up. Each time Pr 11.45 is changed to select a new motor, or the rated current defined by Pr 5.07 or Pr 21.07 (depending on the motor

selected) is altered, the accumulator is reset to zero.

The drive reactive current is shown in this parameter for all modes.

The current limit applied at any time depends on whether the drive is motoring or regenerating and also on the level of the symmetrical current limit.

Pr 4.18 gives the limit level that applies at any instant.

See Pr 4.16 on page 105.

Open-loop, Closed-loop vector, Servo

This parameter displays the actual torque producing current (Pr 4.02) as a percentage of rated active current. Positive values indicate motoring and

negative values indicate regenerating.

Regen

This parameter displays the active current (Pr 4.02) as a percentage of the rated current (Pr 5.07 or Pr 21.07). Positive values indicate power flow

from the supply and negative values indicate power into the supply

4.17 Reactive current

Drive modes Open-loop, Closed-loop vector, Servo, Regen

Coding