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Sevcon Dragon8 - Page 66

Sevcon Dragon8
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Doc. # 177/52705
Rev. 1.0
58
Figure 24 - Input characteristics
The throttle value calculated from the voltage can be read at 2620
h
.
Dual Throttle Inputs
Single and dual throttle inputs are supported.
Single throttle inputs are normally used with other interlock inputs (e.g. FS1, deadman, etc) and use a
single input voltage to determine driver demand.
Dual throttle inputs use two separate input voltages, each of which is converted to a throttle value using
2910
h
, sub-indices 3 to 6 (throttle input 1) and sub-indices 7 to 10 (throttle input 2). If the throttle values
differ by more than 5%, a throttle fault is set and the system will not drive.
To enable dual throttle functionality, map a second analogue input to 2224
h
. The throttle value for the
second throttle input can be read at 2626
h
.
Dual throttle systems allow a virtual FS1 feature, which can be used instead of an actual FS1 switch.
This feature can be enabled on dual throttle systems using 2910
h
, 1.
CAUTION: The voltage input characteristics of the two analogue throttle inputs must be different.
Creep Torque
Set creep torque at 291f
h
. Creep torque allows a small amount of torque to be applied as soon as the
throttle is closed. This can be used on some vehicles to overcome the friction required to achieve initial
vehicle movement.

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