E
Elle
ec
cttrriic
ca
al
l
s
sy
ys
stte
em
m
1
10
0..1
11
1
C
Ch
haassssiiss
A
AT
TL
LE
ET
T
S
SE
ER
RV
VIIC
CE
E
M
MA
AN
NU
UA
AL
L
1
10
0..3
3
C
Ch
ha
as
ss
siis
s
0
0
10
10.3
.3.1
.1
Ch
Chec
ecki
king t
ng the A
he ATC - c
TC - ch
has
assi
sis co
s conn
nnec
ecti
tion
on
(This is performed in combination with service and replacing of the ATC).
(This is performed in combination with service and replacing of the ATC).
1.
1.
This
This sh
shoul
ould be
d be ch
check
ecked
ed usi
using
ng a ca
a calib
librat
rated
ed DMM
DMM in
in ord
order t
er to
o
determine whether the
determine whether the A
ATC makes good contact with
TC makes good contact with the rest of
the rest of
the chassis. Set the digital multimeter
the chassis. Set the digital multimeter to resistance
to resistance
measu
measuremen
rement, me
t, measur
asuremen
ement rang
t range 2
e 200 Oh
00 Ohm.
m. . T
. Touch
ouch the
the
measurement probes together and read off the display. The value
measurement probes together and read off the display. The value
oug
ought t
ht to b
o be 0.
e 0.0 to
0 to app
approx
rox. 0
. 0.6
.6 Ohm
Ohm.. ..
2.
2.
Con
Connec
nect one o
t one of the me
f the measu
asure
remen
ment pro
t probes t
bes to one of t
o one of the b
he brig
right sc
ht screw h
rew head
eads on
s on
the ATC box and the other probe to the screw for the chassis connection,
the ATC box and the other probe to the screw for the chassis connection,
(located on the
(located on the battery wall
battery wall under the A
under the ATC connection green/yellow cable).
TC connection green/yellow cable).
The value read off should not be more than max. 0.5 Ohm higher than the
The value read off should not be more than max. 0.5 Ohm higher than the
read off value under point 1.
read off value under point 1.
3.
3.
If the v
If the valu
alue is hi
e is highe
gher make
r make a che
a check on s
ck on some
ome of th
of the oth
e other sc
er screw
rews on th
s on the A
e ATC
TC
box. If this does not help the screw for
box. If this does not help the screw for the chassis connection must be
the chassis connection must be
checked. First check by measuring this across another clean metal surface,
checked. First check by measuring this across another clean metal surface, if
if
the value is also too high the thread for
the value is also too high the thread for the chassis connection should be
the chassis connection should be
cleaned using a plug tap and a new check should be performed.
cleaned using a plug tap and a new check should be performed.
Important!
Important!
Chassis faults should always be rectified during the servici
Chassis faults should always be rectified during the servicing.
ng.
10
10.3
.3.2
.2
P
Pot
oten
enttia
ial
l me
meas
asur
urem
eme
ent
nt
The potential measurement on the chassis is
The potential measurement on the chassis is performed with a voltage divider
performed with a voltage divider
connected between B+ and B-, with
connected between B+ and B-, with the centre outlet connected to the
the centre outlet connected to the chassis. The
chassis. The
voltage divider has sufficiently large
voltage divider has sufficiently large resistances to comply with EU's insulation
resistances to comply with EU's insulation
requirements at the same time
requirements at the same time as potential changes can be measured via
as potential changes can be measured via an analogue
an analogue
input on the ATC.
input on the ATC.
If voltage is discovered on the chassis an error code is displayed. The error code is
If voltage is discovered on the chassis an error code is displayed. The error code is
stored together with the time and date in t
stored together with the time and date in the error log.
he error log.
Ω
Ω
Ω
Ω
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