Fault Detection And Handling - Sevcon Gen4 Applications Reference Manual

Fault detection and handling

There are five categories of faults as described in Table 1. For a detailed list of faults see Table 7
on page 7-10.
Fault severity Controller latched off
until
Return to base Cleared by Sevcon
(RTB) personnel
Very severe (VS) Cleared by authorized
service personnel
Severe (S) Keyswitch recycled
(turned off then on)
Drive-inhibit (DI) User deselects all
drive switches before
reselecting
Information (I) Not latched
Table 1 Fault categories
2-12
Consequences
Immediate shut down of the system with the
exception of the power steering if needed. Power
is removed to nearly all external components.
Immediate shut down of the system with the
exception of the power steering if needed. Power
is removed to nearly all external components.
Immediate shut down of the system with the
exception of the power steering if needed. Power
is removed to nearly all external components.
Neutral brakes or coasts the traction motor(s) to a
stop. The fault prevents the operator initiating
drive, but does not inhibit braking function, in
particular, controlled roll-off braking.
Information faults do not require immediate
action, although some cutback of power or speed
may occur.