46
Curtis 1244 Manual, Rev. E
CONT hOLDING
e contactor holding voltage parameter defines the output duty cycle of
the main, auxiliary, reverse, and electromagnetic brake drivers. is parameter
is adjustable from 20% to 100% of the battery voltage, in 2% increments. It
allows the OEM to reduce the average applied voltage so that a contactor coil
or other load that is not rated for the full battery voltage can be used.
For example, contactor coils rated for 12V could be used with a 36V
system if the contactor holding voltage parameter were set to 34%. e pa-
rameter can be set lower than the rated contactor coil voltage, as long as it is
set high enough to hold the contactor closed under all shock and vibration
conditions the vehicle will be subjected to. Low settings minimize the current
required to power the coil, thereby reducing coil heating and increasing battery
life. Recommended values for the contactor holding voltage parameter should
be determined with specifications or advice from the contactor manufacturer.
is parameter aects all the driver outputs, so the loads on each driver
must allow operation at the set holding voltage. In addition, the loads on each
driver must be compatible with a PWM signal (if the parameter is set to a value
less than 100%), as the output is pulse width modulated.
CONT PULL IN
e contactor pull-in voltage parameter sets the peak voltage applied to the
loads connected to the main, auxiliary, reverse and electromagnetic brake drivers.
Typically these loads are contactor coils. e pull-in parameter allows a high
initial voltage to be supplied when the driver first turns on, to ensure contactor
closure. After 0.1 second, the driver voltage drops to the value specified by the
contactor holding voltage parameter. Recommended values for this parameter
should be determined with specifications or advice from the contactor manufac-
turer. is parameter is adjustable from 20% to 100% of the nominal battery
voltage, in 2% increments.
VOLTAGE
e battery voltage parameter sets the overvoltage and undervoltage protection
thresholds for the electronic system. is parameter determines when regen
should be cut back to prevent damage to batteries and other electrical system
components due to overvoltage. Similarly, the undervoltage threshold protects
systems from operating at voltages below their design thresholds. is will
ensure proper operation of all electronics whenever the vehicle is driven. e
3 — PROGRAMMABLE PARAMETERS: Other Parameters
Other Parameters
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