Curtis PMC 1204X/1205X/1209/1221 Manual
36
GLOSSARY
6
GLOSSARY:
FEATURES and FUNCTIONS
Acceleration rate
A built-in acceleration rate circuit maintains a maximum rate of power increase
to the motor. If the throttle is applied full on at start-up, the acceleration rate
setting determines how quickly the controller output increases. The standard
setting is such that with the throttle full on, the controller requires approximately
one second to reach full output. This feature contributes to smooth, gentle starts.
The acceleration rate is adjustable via an externally accessible trimpot; see
Section 4 for adjustment instructions. The deceleration rate is fixed, and cannot
be adjusted.
Arcless contactor switching
Each time the forward/reverse switch passes through neutral, the controller’s
output is rapidly turned off (even if the throttle is held on) so that all motor
current has stopped by the time the forward/reverse contactor drops out. Control-
ler output always starts at zero and increases smoothly at the set acceleration rate
each time a new direction is selected. As a result, forward/reverse switching is
arcless.
Bypass contactor switching is also arcless, provided the current being inter-
rupted is below the controller’s current limit.
Bypass (1A)
[OPTIONAL FEATURE]
If the throttle input is greater than 90% for more than one second, the controller’s
bypass contactor output is turned on. This closes the bypass contactor that
connects M- directly to B-, thus connecting the motor directly to the battery.
Bypass allows the motor current to exceed the maximum controller current limit,
giving the operator access to more torque (for getting the vehicle out of a hole, for
example, or up a ramp). A fuse should be installed in the power wiring circuit to
protect the motor when using bypass.
Curtis PMC controllers are so efficient that the difference in efficiency when
operating with and without bypass is negligible. The main advantage of bypass is
the additional torque it can provide in overload conditions.
The 1204X/1205X/1209/1221 controllers are available with or without the
bypass feature in the 12V and 24–36V models. The bypass option is not available
in the higher powered models.
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