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Curtis PMC 1204/1205 Manual
At the reduced performance level, the vehicle can be maneuvered out of
the way and parked.
Full current limit and performance return automatically after the
controller cools down. Although this action is not damaging to the
controller, it does suggest a mismatch. If thermal cutback occurs often in
normal vehicle operation, the controller is probably undersized for the
application and a higher current model should be used.
The controller is similarly protected from undertemperature. Should
its internal temperature fall below -25°C (-13°F), the current limit
decreases to approximately half of the set current. When the controller
warms up, full current limit and performance return automatically.
Undertemperature
See Thermal protection.
Undervoltage protection
The control circuitry requires a minimum battery voltage to function
properly. The controller is therefore designed so its output is gradually
reduced if the battery voltage falls below a certain level. Cutback voltages
for the various models are listed in the specifications (Appendix C).
Reducing the output to the motor allows the battery voltage to recover,
and an equilibrium is established in which the battery supplies as much
current as it can without falling below the cutback voltage.
GLOSSARY
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