Sevcon Gen4, Applications Reference Manual, Page: 104 / 123

Doc. # 177/52701
Rev3
6-34
Vehicle features and functions
Ensure you have completed the CANopen network setup, Motor Characterization, I/O
Configuration and Vehicle Performance Configuration processes described above.
Contactors
Ensure voltage control has been selected (see ‘Analogue’ on
page 6-15).
To configure any contactor:

Set pull-in voltage, pull-in time and hold-in voltage at 2D00
h

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 object (2400
h
) 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 5180
h
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 Gen4 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 object (2420
h
) 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.