• Enable each output to operate at the pull-in voltage or at the maximum voltage at 2D01
h
• If required enable each output to reduce to the hold voltage level at 2D02
h
Line contactor
The line contactor must be mapped to an analogue output.
The line contactor is used to isolate controllers and motors from the battery during power down or in
case of a serious fault. It is normally closed all the time the vehicle is powered, but it can be configured to
open when the vehicle has been stationary for a period of time.
Configure line contactor dropout at object 2820
h
. See also ‘Contactors’ above.
The controller has a capacitor pre-charge feature used to protect line contactor tips from damage due to
in-rush currents when the contactor closes.
NOTE: Writing to 5180h starts a pre-charge cycle. The pre-charge circuit can only supply enough current to
charge the capacitors of one controller. Where more than one controller is present, the pre-charge circuit on each
must be used. If an Dragon8 is configured as the vehicle master, it controls the pre-charge of all slave nodes
automatically.
The pre-charge level is configurable between 50% and 90%. The level can be adjusted by object 5820
h
.
The minimum capacitor voltage allowed for the line contactor to close is set in 5821
h
.
Electro-mechanical brake
WARNING: Electro-mechanical brakes are not recommended for on-highway vehicles as they
can cause the traction motor/wheel to remain locked or brake severely if the wheel is
momentarily locked due to loss of traction on a slippery surface and/or mechanical braking. Also,
electro-mechanical brakes normally fail to the applied state, meaning any loss of power, or wiring
fault can cause the brakes to be applied.
The electro-mechanical brake must be mapped to an analogue output.
Set the conditions under which it is applied at 2903
h
.
The brake can be applied when the vehicle stops or when roll-off is detected. If the brake is configured to
apply when the vehicle stops, it is not applied until the vehicle has been stationary for more than the
brake delay time. The brake also can be configured to not apply if the vehicle speed exceeds a minimum,
configured in 2903
h
,6, during the brake apply timer period. This can be used to prevent the electro
brake being applied whilst the vehicle is moving.
In the event of a severe fault the brake can be configured (via 2905
h
,5) to apply immediately or to wait
until the vehicle to stops before applying the brake. In the event of an encoder fault however brake
remains released.
WARNING: In the event of an Encoder Fault on a
slave node
causing a perceived zero speed by
the master traction controller, the brake will apply regardless of the setting in (via 2905h,5). This
caveat only applies to multi node systems.
It is possible to detect an electrobrake wire off by configuring a minimum brake coil current in 2903
h
,4.
Should the coil current drop below this value whilst energised, then the controller will set a Drive
Inhibit Fault and neutral brakes to a stop. The fault clears when neutral is selected, if the brake is
commanded to be applied, or neutral is selected and the current exceeds the minimum value.
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