Kohler Curtis F Series User Manual

3 — APPLICATION-SPECIFIC FEATURES
Curtis AC F2-A, F4-A, F6-A Motor Controllers – FOS 4.5 – April 2022 Return to TOC
pg. 34
Beyond the default or a redened normal operating window, the controller’s actions for over- and
under-voltage conditions are both voltage and time-duration based. As illustrated in the graph
and following paragraphs, these responses are xed. No parameters can change or modify the
hardware restrictions.
Regen Cutback, with a 64ms delay before the OV Fault
Drive current Cutback, with a 64ms delay before the UV Fault
Over-Voltage Region
ere is no delay on the Over-Voltage cutback. ere is a 64ms delay on asserting the OV fault. e
controller will seek to reduce the voltage by progressively reducing regen (motor-braking torque).
e Overvoltage Cutback fault (ash code 2-4) is set.
Severe Over-Voltage Region
Should the B+ voltage rise to this region, it triggers the Severe B+ Over-voltage fault (ash code 1-8).
Normal controller operation will cease.
Under-Voltage Region
ere is no delay in the drive current reduction (motor torque) in this region. ere is a 64ms delay
before the Under-voltage Cutback fault is asserted (ash code 2-3).

Kohler Curtis F Series Specifications

General

Brand	Kohler
Model	Curtis F Series
Category	Controller
Language	English