Safety
Information
Introduction
Product
information
System
design
Mechanical
installation
Electrical
installation
Getting
started
Optimisation
Parameters
Techn i cal
data
Component
sizing
Diagnostics
Unidrive SP Regen Installation Guide 103
Issue Number: 2 www.controltechniques.com
The current demand is the output of the voltage controller in Menu 3 subject to the current limits.
Current limits are provided in regen mode, however, if the current limits are active the DC link voltage can no longer be controlled. The motoring
current limit applies with either phase rotation at the input when power is being taken from the supply. Similarly the regen current limit applies with
either phase rotation at the input when power is being fed back into the supply. The symmetrical current limit can override either motoring or
regenerating current limit if it is set at a lower value than either limit.
In regen mode it is possible to produce some current in the x axis of the reference frame so that the Regen drive can be made to produce or consume
reactive power. This parameter defines the level of reactive current as a percentage of the regen mode rated current (Pr 5.07). Positive reactive
current produces a component of current flowing from the supply to the drive at the Regen drive terminals that lags the respective phase voltage, and
negative reactive current produces a component of current that leads the respective voltage. It should be noted that the maximum current in regen
mode is limited to DRIVE_CURRENT_MAX, and so the drive applies a limit to this parameter (REGEN_REACTIVE_MAX) to limit the current
magnitude. Therefore the symmetrical current limit (Pr 4.07) must be reduced below its maximum value before this parameter can be increased from
zero.
4.04 Current demand
Drive mode Regen
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111111
Range Regen ±TORQUE_PROD_CURRENT_MAX %
Update rate 4ms
4.05 Motoring current limit
Drive mode Regen
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
11 1 111
Range Regen 0 to MOTOR1_CURRENT_LIMIT_MAX %
Default Regen 175.0
Update rate Background
4.06 Regen current limit
Drive mode Regen
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
11 1 111
Range Regen 0 to MOTOR1_CURRENT_LIMIT_MAX %
Default Regen 175.0
Update rate Background
4.07 Symmetrical current limit
Drive mode Regen
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
11 1 111
Range Regen 0 to MOTOR1_CURRENT_LIMIT_MAX %
Default Regen 175.0
Update rate Background
4.08 Reactive current reference
Drive mode Regen
Coding Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
11 11
Range Regen ±REGEN_REACTIVE_MAX %
Default Regen 0.0
Update rate 4ms
To Next Page
Loading...