Navistar Electrical Systems CV
Integration Guide
Page 41 of 84
Revision Date: 9/12/2019
N
.O
.
C
o
n
ta
c
t
G
P
T
O
L
o
a
d
F
e
e
d
b
a
c
k
Provides
confirmation
that the
PTO Relay
has closed
when
requested,
and that it
opens when
commanded
to do so
PTO load
feedback
provides
confirmation
that the load is
in the state
commanded,
whether
engaged or
disengaged
1
.
Configuring
load feedback
monitoring 'off'
via
configuration
will inhibit
automatic
PTO
disengage (all
modes)/engin
e shutdown
(remote mode)
if the load
relay fails.
relays fail
more often.
and
interruptin
g
operation,
too
frequently.
G
e
n
e
ra
l
G
ro
u
n
d
P
o
w
e
r
R
e
tu
rn
D
V
e
h
ic
le
G
ro
u
n
d
Signal
Reference
Reference
for all
signals
monitored
for faults
that would
lead to a
safety
issue
Measurement
s made at
various points
within the
system are
taken with
respect to a
nearby ground
in the harness
or to the frame
of the upfitted
equipment. If
this "local"
ground is not
at the same
voltage level
as the rest of
the vehicle
ground (which
can happen if
there is high
resistance in
the ground
circuit) these
measurement
s will not be
consistent.
Safety
Mechanisms
require that
they must be.
Good
grounding
practices must
be employed.
Voltage drop
between any
two points in
the ground
system must
not exceed 1.0
VDC.
Safety
mechanis
ms may
activate
unexpecte
dly,
potentially
leading to
operator /
customer
annoyanc
e.
P
e
n
d
a
n
t
S
w
it
c
h
P
o
w
e
r
S
u
p
p
ly
J
,
P
e
n
d
a
n
t
S
u
p
p
ly
