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Curtis PMC 1204/1205 Manual
battery. The controller acts like a dc transformer, taking in low current
and high voltage (the full battery voltage) and putting out high current
and low voltage. The battery needs to supply only a fraction of the current
that would be required by a conventional controller (in which the battery
current and motor current are always equal). The current multiplication
feature gives vehicles using Curtis PMC controllers dramatically greater
driving range per battery charge.
Environmental protection
Curtis PMC 1204 and 1205 controllers are housed in rugged anodized
aluminum extrusions that provide environmental protection. Controllers
must be kept clean and dry, however, to ensure long life.
High pedal disable (HPD)
[OPTIONAL FEATURE]
By preventing the vehicle from being turned on with the throttle applied,
HPD ensures the vehicle starts smoothly and safely. If the operator
attempts to start the vehicle when the throttle is already applied, the
controller (and the vehicle) will remain off. For the vehicle to start, the
controller must receive an input to KSI before receiving a throttle input.
In addition to providing routine smooth starts, HPD also protects against
accidental sudden starts if problems in the pedal linkage (e.g., bent parts,
broken return spring) give a throttle input signal to the controller even
with the pedal released.
The 1204 and 1205 controllers are available either with or without
the HPD feature.
KSI
KSI (Key Switch Input) provides power to the controller’s logic board via
both the keyswitch and the footpedal microswitch. For vehicles that have
no keyswitch, KSI is routed through the footpedal microswitch. For non-
vehicle applications (such as conveyor belts), KSI may simply be tied to B+.
MOSFET
A MOSFET (Metal Oxide Semiconductor Field Effect Transistor) is a
type of transistor characterized by its fast switching speeds and very low
losses.
Overtemperature
See Thermal protection.
GLOSSARY
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