Volvo VNL, Руководство по обслуживанию

Страница: 12 / 100

Group 30 Electrical System—VNL, VNM Design and Function
Short Circuit
The term short circuit is used to describe another type of
condition which can develop in electrical circuits or units.
It refers to a circuit that is completed in the wrong way,
such as two bare wires touching each other, so that the
current bypasses part of the normal circuit. Bypassing part
of the normal circuit simply means that the current has
found the path of the least resistance and a higher current
flow, amperage, results. This can result in blown fuses,
open circuit breakers, wiring or component overheat,
burned parts and insulation and, of course, non-working
components. Hot, smelly insulation is always a sign of
trouble. If the wire melts through, there is no electrical
path, so the circuit then becomes open.
W3000490
Grounded Circuit
A grounded circuit is similar to a short circuit in that
the current bypasses part of the normal circuit. In this
instance, the current flows directly to ground. This may
be caused by a wire touching ground or part of the circuit
within a unit coming in contact with the frame or housing
of the unit. A grounded circuit may also be caused by
deposits of oil, dirt and moisture around connections or
terminals.
W3000491
10