electrIcal systems - chassIs — 9
12
2 0 0 8 l a Pa l m a X l
Battery maIntaIner (BI-DIrectIonal
ISolator relay Delay)
The Battery
Maintainer (Bi-
Directional Isolator
Relay Delay) constantly
senses the voltage of
the house and chassis
batteries.
With the engine
running and the
alternator on, the engine
will maintain chassis and house battery voltage.
When the motorhome is plugged into shore
power or operating from the generator, both the
house and chassis batteries are charged from the
inverter. If neither battery is being charged, the
batteries are fully isolated.
The battery maintainer also senses heavy loads
on either battery bank 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.
080406
080405
080405d
Single Pole Single Throw
Relay.
080405b
080405c
060216l
Located in
front roadside
compartment
Summary of Contents for 2008 LaPalma XL
Page 12: ......
Page 14: ......
Page 16: ......
Page 47: ...43 2008 LaPalma XL driving safety 2 Weight Record Sheet Actual Worksheet 020255b...
Page 102: ...appliances 4 98 2008 Lapalma xl Notes...
Page 128: ...equipment 5 124 2008 LaPalma xl Notes...
Page 144: ...water systems 6 140 2008 LaPalma xl Notes...
Page 172: ...electrical systems house 8 168 2008 LaPalma xl Notes...
Page 188: ...electrical systems chassis 9 184 2008 LaPalma xl engine no start flow chart...
Page 232: ...INDEX 228 2008 LaPalma xl Notes...
