User Guide

FAULT TRACING Honeywell • 33
7.2 Other fault conditions
The following fault tracing diagram will help you to locate and fix some of the most usual prob-
lems. If the problem persists contact your local distributor.
Figure 2. Fault tracing diagram for BACnet MS/TP
Drive does n
ot
start from the
bus
C
heckcommuni-
cati
o
nsta
t
us
(
par.
5.7.
3
.
2.
1/5.8.3.2.2
)
C
o
unter does not
run
C
o
unter for b
a
d
fra
m
es (s
e
e
T
a
b
l
e
3) in
cr
eases
C
o
u
nter
O
K
.
No
co
m
m
unic
atio
n
P
o
or
c
o
m
m
u
n
ic
a
tio
n
Is the
d
e
vice i
n
READY s
ta
te?
Che
c
ktheledon
key
p
ad
Che
c
kexterna
l
inter
l
ockings (
I
/
O
)
Is fieldbus selec
t
e
d
as c
o
ntro
l
place?
Che
c
k
p
aramete
r
Doe
sMaster
g
ive
RUN c
o
m
m
an
d
?
Us
ek
eypad to
mon
ito
r
Se
tvariableAV36
to ‘1’
C
he
c
k
fieldb
u
s
param
e
te
r
s
C
h
eck
o
th
e
rfi
e
ld-
bus par
a
mete
r
s
C
he
c
k
selected
protocol
Che
c
kMaster’s
pa
ra
met
e
rs
Che
c
kconfigura
-
tions (Slave add-
ress,
b
audra
t
e
e
t
c.
)
Che
c
kterminat
i
o
n
r
e
s
i
sto
r
s
Check that both ends of the fieldbus
lin
ehavet
ermina-
tio
n
r
e
s
i
s
to
rs
(c
h
apter 4.2)
Ch
e
c
k
cab
l
ing
Ch
e
c
k
cab
l
efor
cuts
C
h
e
ck c
orr
e
ct p l
a
ce-
ment o
fc
onducto
rs
i
n
te
rm
i
n
a
ls
Oth
e
r
b
us devices
Check o
th
er
nec
e
s
sa
ry device
s
(e
.g
.
r
outer)
C
h
eck t
e
rmin
a
ti
o
n
re
s
i
s
tors
C
he
c
k
th
a
tb
o
th
en
d
so
f
t
h
efi
e
l
db
u
s
line
ha
ve
t
er
m
i-
nation resistors
(cha
pt
e
r
4.2)
Che
c
kcabling
Che
c
kdistan
c
e
s
be
t
w
e
en
c
a
bl
e
s
,
s
e
ec
h
apter 4.2
.
Ch
e
c
k
cab
l
e
type
s
,
s
e
e
c
h
a
pter
3
.
Che
c
k
g
rounding
Che
c
k
g
rounding
,
se
ec
h
a
p
te
r
4.
R
e
-
me
m
be
rto
m
a
ke
gro
u
nd
i
ng for eac
h
devi
c
e!
C
h
eck connect
i
on
s
C
h
eck stripping
o
f
c
a
b
le
sand
c
o
n
d
uct
or
s
,s
ee
chapter 4.
C
h
e
c
k
t
er
mi
n
a
l
sf
o
r
l
oo
s
ec
onn
e
ct
i
o
n
s
7076A_uk
M3.2.1
FB Control
Word (M2.12)