- General Electric Computer Accessories User Manual

GEH-6385 Reference and Troubleshooting, 2300 V Drives Chapter 3 Paramters/Functions •
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• 3-103
The active generating torque limit is subject to further limiting by the DC Bus
Regeneration Control. The Regeneration Control can be configured to limit
regenerative capability in response to DC Bus Voltage exceeding programmed
limits. Both motoring & generating torque limits are dynamically applied as positive
& negative torque limits according to the detected quadrant of operation.
The magnitude current limit is affected as a limit to the torque-producing current
component based upon a dynamic calculation that considers the active value of the
flux-producing current component. Pullout protection limits and power-dip clamp
controls may dynamically further decrease the current limit prior to application to the
torque-producing current command.
Appropriate excitation of the induction motor is provided by the motor control
algorithm according to configured motor nameplate data and prevailing power
supply conditions. However, in some advanced applications it may be appropriate for
the application control layer to define further modification to the flux reference. This
is accomplished using the Flux ref ratio signal, which may be adjusted statically by
the fixed parameter Flux ref ratio setpt or a dynamic signal selected by the parameter
Flux ref ratio sel. In either case the signal is defined as a per-unit offset to the
nominal flux reference defined by the motor control; one per-unit flux is defined as
Motor rated voltage at Motor rated freq.
Related diagrams
• Motor Control Interface (Core)
Speed Control Fault Check
The Speed Control Fault Check checks for the following fault and alarm conditions:
• Over speed
• Failure to rotate
• Loss of spd control
• Reverse rotation
Over speed configuration and operation
The following parameter configures the Over speed fault.
Parameter Description
Over speed flt level Overspeed fault level. RPM
The Over speed fault is declared when the following condition is met.
ABS(Speed reg fbk) > Over speed flt level