Curtis 1244 Manual, Rev. E
17
2 — INSTALLATION & WIRING: Contactor Drivers
ese checks can be disabled using a programmer—see Section 3, pages 44 and
45. A coil suppression diode is provided internally to protect the drivers from
inductive spikes generated at turn-o. To take advantage of the controller’s
internal coil suppression diode, Pin 9 must be wired such that the return path
to the contactor drivers cannot be opened by any switches or contactors.
e driver loads are not limited to contactor coils. Any load can be con-
nected to a Pin 17–20 driver as long as it does not exceed the driver’s 2 amp
current rating.
For information on programming the various contactor-related parameters,
see Section 3: Programmable Parameters.
Main Contactor Driver
In the standard configuration, the main contactor driver (Pin 17) pulls low
when the keyswitch input is enabled; this wiring is shown in the standard wiring
diagram (Figure 3, page 8).
Alternatively, the main contactor driver can be programmed not to pull
low until the interlock input as well as the keyswitch input is enabled. To do
this, the Main Contactor Driver Interlock parameter must be set to “On.” If
the Main Contactor Driver Interlock parameter is On, the Main Contactor
Dropout Delay parameter can be set to allow the main contactor to remain
engaged for up to 40 seconds after the interlock signal has been disabled. If the
interlock and delay functions are used, the main contactor and the coil return
(Pin 9) must both be wired to KSI. is alternative wiring is shown in Figure 12.
Auxiliary Contactor Driver
Like the main contactor driver, the auxiliary contactor driver (Pin 18) pulls
low when the interlock input is enabled. e output will be pulse-width-mod-
ulated at the coil holding voltage along with the main, reverse signal, and
electromagnetic brake contactor drivers, if the Holding Voltage parameter is
set to less than 100%.
If desired, the Auxiliary Contactor Dropout Delay parameter can be set
to allow the auxiliary contactor to remain engaged for up to 40 seconds after
the interlock signal has been disabled. If the delay function is used, the auxiliary
contactor and the coil return (Pin 9) must both be wired to KSI rather than
the interlock input. is alternative wiring is shown in Figure 12.
Reverse Signal Driver
e reverse signal driver (Pin 19) pulls low when the vehicle is moving in the
reverse direction, either in drive or in braking mode. is driver is designed
to drive a reverse signal beeper or warning lamp that operates when one input
is pulled low. e output will be pulse-width-modulated at the coil holding
voltage along with the main, auxiliary, and electromagnetic brake contactor
drivers, if the holding voltage parameter is set to less than 100%.
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