Curtis Instruments AC F4-A - Over-Voltage Region; Severe Over-Voltage Region; Under-Voltage Region

3 — APPLICATION-SPECIFIC FEATURES
pg. 27
Return to TOC Curtis AC F4-A Motor Controller – August 2020
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.
Over-Voltage Region
No reduction in regen, nor is the Overvoltage Cutback set within the rst 100ms. Aer this period,
the 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+ Overvoltage fault (ash code 1-8).
Normal controller operation will cease.
Under-Voltage Region
No reduction in drive current (motor torque), nor is the Undervoltage Cutback set within the rst
100ms. Aer this period, progressive reduction in drive current occurs. e Undervoltage Cutback
fault (ash code 2-3) is set.