Wiring: Drivers - Curtis 1268 Manual

2 — INSTALLATION & WIRING:
12
Throttle

WIRING: Drivers

The 1268 controller provides four drivers (at Pins 17, 18, 19, 23) for the main
contactor, brake light relay, reverse alarm, and aux contactor/relay. These four
outputs are low-side drivers, designed to energize inductive coils or a piezo-
electric reverse alarm. The brake light relay, reverse alarm, and aux are optional
functions.
With the exception of the coil used at the aux driver (Pin 23), it is necessary
to specify the connected coil voltage at the nominal battery pack voltage. The
aux driver can be set to either 100%, 60%, or 35% of system voltage. These
fixed percentages are used for the Coil Pull-In Voltage and Holding Voltage.
See Section 3 for more information on programming these parameters.
A coil suppression diode is provided internally to protect two of the driv-
ers (J1-17, 23) from inductive spikes generated at turn-off. To take advantage
of the controller's internal coil suppression diode, the coils must be wired such
that the return path to the drivers cannot be opened by any switches or contac-
tors, as shown in the standard wiring diagrams (pages 8, 9).
DRIVER
Main Contactor
Brake Light Relay
Reverse Alarm
Aux (EMB/WalkAway
The driver loads are not limited to contactor coils. Any load can be connected
to a Pin 18, 19, or 23 driver as long as it does not exceed the current rating.
For information on programming the various driver-related parameters,
see Section 3: Programmable Parameters.
Main Contactor Driver
The main contactor driver (Pin 17) pulls low when (a) the tow/store switch,
keyswitch input, and pedal interlock switch are enabled, (b) a direction is
selected, and (c) throttle is applied; it stays low until near zero speed at zero
throttle, or until a critical fault occurs. This wiring is shown in the standard
wiring diagrams (pages 8, 9).
Brake Light Relay Driver
The brake light relay driver (Pin 18) pulls low when the vehicle enters a braking
state. A relay can be used with this driver to pass current from an auxiliary battery
to the vehicle brake lights. This output is not to be connected directly to the
brake light. A flyback diode should be connected across the coil of the relay to
protect the driver, as shown in the standard wiring diagrams (pages 8, 9).
RATED
PIN CURRENT
J1-17 2.0 A
J1-18 0.5 A
J1-19 0.02 A
) J1-23 2.0 A
™
RATED INTERNAL
LOAD DIODE
VOLTAGE PROTECTION
B+ yes
B+ no
B+ no
B+, 36V, 24V yes
Curtis 1268 Manual,
Rev. D