Curtis PMC 1204X/1205X/1209/1221 Manual
19
WIRING
Bypass Wiring
If you are using a potbox, wire the control and power circuits for the bypass
contactor as shown in Figure 8. If you are using an ET-series electronic throttle,
the power circuit is the same; wire the control circuit as shown in Figure 15.
Note that a suppression diode is not used with the bypass contactor coil
because it would slow the turn-off of the contactor with the possible result of a
false fault being detected. Bypass contactors should be used only with controllers
that have the optional bypass feature. The bypass option is available only on 12V
and 24–36V controllers.
WIRING: PM MOTORS
Because of their M- fault detect circuitry, 1204X/1205X/1209/1221 controllers
are not compatible with permanent magnet (PM) motor applications. During
deceleration, the PM motor would act as a generator, holding the M- terminal
low. As the throttle demand is less than 80%, the controller would interpret this
as a fault and would shut itself off. The keyswitch would then need to be recycled
before the controller could operate. Another problem is that plug braking could
not be used without adding external circuitry. These controllers are not recom-
mended for use with PM magnet motor systems. Consult your Curtis office for
controllers compatible with PM motors.
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