Forward/Reverse Wiring - Curtis 1204M Manual

2 — INSTALLATION & WIRING:
Fig. 6
Control wiring
to inhibit plug braking, in
order to allow freewheeling.
Curtis 1204M/1205M/1209M/1221M Manual

Forward/Reverse Wiring

Interlocks (seat switches, battery charger interlocks, etc.) should be wired
in series so that they turn off the controller KSI and the contactors.
Forward/Reverse Wiring
With these controllers, 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; this is the
wiring shown in Figures 4 and 5. Some vehicles, especially those previously us-
ing older, resistor-type controllers, may reverse the motor armature rather than
the field winding. Be careful if you are replacing this type of controller.
Plug braking
Wired as shown in the basic wiring diagrams, the vehicle will plug brake if
the direction is changed with the vehicle moving and the throttle applied. The
forward/reverse switch should be in the positive feed to the contactor coils, so
that they can be turned off by the keyswitch and any interlocks. The coil of
one contactor or the other is energized to select the direction desired.
Freewheeling (wiring to inhibit plug braking)
If plug braking is not desired, the vehicle can be wired so that moving the
forward/reverse switch through neutral causes the vehicle to freewheel as long
as the throttle is applied. Plug braking can be reactivated during freewheeling
by releasing the throttle and reapplying it. The HPD option must be enabled
(programmed On) in order for this arrangement to work.
As shown in Figure 6, another set of contacts is added on the forward/reverse
switch. Therefore, a double-pole, double-throw (DPDT) center-off switch must
be used for this setup. A "hesitation switch" is recommended, to ensure the switch
is in neutral long enough to actuate HPD and inhibit plug braking.
FUSE KEYSWITCH
POLARITY
+
PROTECTION
DIODE
–
J1
PEDAL
INTERLOCKS
MICROSWITCH
F/R SWITCH
(DPDT, center off)
9