Monaco 2008 Knight, Руководство пользователя

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13
2 0 0 8 K n I G h t
electrIcal systems - chassIs — 9
Battery maIntaIner (BI-DIrectIonal
ISolator relay Delay)
The Battery
Maintainer (Bi-
Directional Isolator
Relay Delay) constantly
senses voltage of the
house and chassis
batteries.
With engine running,
both the house and
chassis batteries are
charged from the
engine’s alternator.
When the motorhome is plugged into shore
power or operating from the generator, both the
house and chassis batteries are charged from
the inverter/converter. If neither battery is being
charged, the batteries are fully isolated.
The battery maintainer also senses heavy loads
on either battery to prevent the wrong battery
from being inadvertently discharged.
Relays
The motorhome uses various
relays to operate electrical
equipment, such as lights and
motors. If a relay needs to be
replaced, carefully record the
location of each wire and all
markings or labels.
Relays can look the same in appearance, but
differ in function. Note that on the side of the
relay is a schematic drawing identifying if the
relay is 87 or 87a relay. These current ratings
differ, and if mixed, will create problems. Ensure
the replacement relay is of the current rating to
assure proper operation.
Another indicator to the type of relay is the
post or legs. Turn the relay over and look at the
post.
Note the differences between the numbered
posts:
1. The 30 post is the incoming fuse and/or
breaker power. Some relay applications
supply power to the 30 post. Some use
it for ground. The 30 post can be used
many different ways.
2. The 85 post is one side of the coil,
tripped different ways.
3. The 86 post is the opposite side of the
coil, tripped different ways.
4. The 87 posts are not common to the 30
post until the relay is tripped. When the
relay trips, both 87 posts are common
to the 30 post.
5. Using an 87a relay, the 30 post and the
87a post are common. When the coil is
tripped, the 87a post becomes inactive
and the 30 post becomes common to
the 87 post located on the outside of the
relay.
A Single Pole Single
Throw relay (SPST)
is an electro-magnetic
switch consisting of
a coil (terminals 85
& 86), one common terminal (30), one normally
closed terminal (87a), and one normally open
terminal (87).
When the coil of the relay is at rest (not
energized) the common terminal (30) and the
normally closed terminal (87a) have continuity.
When the coil is energized, the common terminal
(30) and the normally open terminal (87) have
continuity.
NOTE
When there is power applied to the coil,
the coil sets up a magnetic field in the
windings. When the power is removed,
the field collapses. A momentary high
voltage discharge will occur. This is how
an ignition coil works.
060216l
Located in front
roadside compartment
080406
080405b
080405c
080405d
Single Pole Single Throw
Relay.