Wesley BC-6200-8SA - Manual (Page 19)

Curtis 1268 Manual, Rev. D
13
Reverse Alarm Driver
The reverse alarm driver (Pin 19) pulls low when the reverse direction switch
is applied. This driver is designed to drive a reverse signal beeper or piezo-
electric buzzer that operates when the vehicle is traveling in reverse or during
WalkAway
™ operation. It can also be programmed to give a warning during
anti-rollback and/or to warn of an overvoltage condition (see Warning Option
parameter).
Auxiliary Driver
The condition for which the auxiliary driver (Pin 23) pulls low depends on how
it is being used. With an EM brake, the driver becomes active (low) when the
vehicle is commanded into motion so as to activate the brake coil and pull in
the brake. In a WalkAway
™ system, the driver becomes active when the vehicle
is rolling while the main contactor is not engaged.
The aux driver’s output is pulse-width-modulated at the coil holding
voltage set by the Holding Voltage parameter. The pull-in voltage set by the
Pull-In Voltage parameter is used in place of the holding voltage for the first
100 milliseconds.
When the aux driver is used with an EM brake, the EMB Delay param-
eter allows for the adjustment of a time delay before the brake engages after
the vehicle is stopped or has slowed below the threshold set by the EMB Speed
Value parameter.
WIRING: External LED Output
The output driver at Pin 22 is designed for use with an external LED to dis-
play fault codes where they can be easily seen by the operator—typically on
the dashboard. This output driver sources 15V from a high-side driver and
resistor, rated at 10mA maximum current.
WIRING: Pedal Interlock Switch
Controller output is possible only when the pedal interlock input (Pin 8) is
pulled to B+. The pedal interlock switch is connected to the throttle mecha-
nism, thus guaranteeing zero controller output when the operator releases the
throttle. This adds a safety feature to protect against throttle failures that could
otherwise cause unintended controller output (vehicle motion).
2 — INSTALLATION & WIRING: Throttle