Name: Control Techniques unidrive sp
Brand: Control Techniques
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Menu 3

Regen

Unidrive SP Advanced User Guide 79

Issue Number: 7 www.controltechniques.com

When regen mode is selected Pr 3.08 is the destination for the digital input on terminal 25 (T25) as default. This input, or an alternative input, should

be connected to an auxiliary contact on the soft-start contactor so that it follows the state of the contactor. The regen unit will only attempt to

synchronise to the supply when this parameter is one. This parameter is also used to monitor the contactor when the regen unit running. If at any time

this parameter is zero the regen unit is immediately disabled.

When the unit has been enabled and successfully synchronised this bit will become active. If the regen unit attempts to re-synchronise or trips, this bit

becomes inactive. When regen mode is selected this bit is routed to a the digital output on terminal 24 (T24) as default. The output, or an alternative

output, should be used to enable the motor drive(s) connected to the DC bus of the regen unit.

Power feed-forward compensation can be used to reduce the transient DC bus voltage produced when a fast load transient occurs on drives

connected to the Regen unit. 100.0% power feed-forward is equivalent to an active current of Rated drive current / 0.45 (i.e. over current trip level)

and an AC terminal peak phase voltage equal to DC_VOLTAGE_MAX / 2. This scaling is the same as the power output from Pr 5.03 when high speed

output mode is used (see section 5.8 Menu 7: Analog I/O ). Therefore an analog output of the drive supplying the load and analog input 2 or 3 of the

drive acting as the supply Regen unit can be connected together to give power feed-forward compensation without further scaling if the two drives are

of equal rating. If the ratings are different the analog input scaling must be used to give the correct power feed-forwards, where the scaling is given by:

Load drive Rated drive current / Regen unit rated drive current

3.08

Soft-start contactor closed

Drive modes Regen