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CONTROL WIRING
FUSE
POLARITY
PROTECTION
DIODE
POWER WIRING
FUSE
+
F
S1
F
–
1A BYPASS
Basic wiring configuration, Curtis PMC 1204X/1205X/1209/1221 controllers.
Fig. 8
Curtis PMC 1204X/1205X/1209/1221 Manual
KEYSWITCH
MAIN
PRECHARGE RESISTOR
(250 Ω, 5 W)
A2
A1
POTBOX
R
S2
R
M-
contactor and the forward/reverse contactors. This will act as a safety feature by
removing power from the motor control system when the keyswitch is off.
Interlocks (seat switches, battery charger interlocks, etc.) should be wired in
series so that they turn off the controller KSI and the contactors. An SRO
interlock (a seat switch, for example) must be wired in order to implement the
optional SRO feature.
Forward/Reverse Wiring
The forward/reverse wiring schemes described here all assume the power wiring
shown by the heavy lines in Figure 8. Some vehicles, especially those previously
using older, resistor-type controllers, may reverse the motor armature rather than
the field winding. Be careful if you are replacing this type of controller. When
using the Curtis PMC controller it is essential that the field be reversed and
that the armature be connected directly to the controller's B+ and A2
terminals, because the plug diode inside is connected to these terminals.
INTERLOCKS
KSI
B-
B+
F/R cont. output
Bypass cont. output
A2
Emergency reverse **
FWD input
REV input
(*not used with SRO controllers)
PEDAL
MICROSWITCH
*
F
(**See Figure 10 for
emergency reverse.)
WIRING
R
13
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