Curtis PMC 1209B/1221B/1221C/1231C Manual
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GLOSSARY
ET-series electronic throttles
The ET-XXX is a wigwag-style throttle control assembly, manufactured by
Hardellet for Curtis. It provides a 0–5V signal in both the forward and reverse
directions along with high side coil drivers for the forward and reverse contactor
coils.
Frequency shifting
The frequency shifting feature is built into the “C” controllers (1221C and
1231C). It reduces the operating frequency from 15 kHz to 1.5 kHz when the
PWM output is less than ≈15%. Frequency shifting improves the current limit
control and also helps protect the controller when the motor is in near-stall
conditions.
NOTE: Operating an electric drive system in stall or near-stall conditions puts
high current and thermal stresses on the motor and controller. This is not
considered a normal operation and is not recommended.
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 throttle
linkage (e.g., bent parts, broken return spring) give a throttle input signal to the
controller even with the throttle released.
The 1209B/1221B/1221C/1231C controllers are available either with or
without the HPD feature.
KSI
KSI (Key Switch Input) provides power to the controller’s logic circuitry via both
the keyswitch and the throttle microswitch. KSI should be used to turn the
controller on and off.
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.
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