PREVOST X3-45 COMMUTER User Manual

SECTION 06: ELECTRICAL
DOB 1300-1556 | X3-45 Commuter PA-1648 Maintenance Manual Section 06 revised release October 2021
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FIGURE 3: ELECTRIC COOLING FAN CIRCUIT
BREAKER BOX
ELECTRIC FAN DRIVE 50 Amps CIRCUIT BREAKERS
ID
Description
connector
CB201 Charge Air Cooler fan #1 - Mo65 1
CB202 Charge Air Cooler fan #2 - Mo67 2
CB203 Radiator fan #3 - Mo68 3
CB204 Radiator fan #4 - Mo69 4
CB205 Radiator fan #5 - Mo70 5
CB206 Radiator fan #6 - Mo71 6
CB207 Radiator fan #7 - Mo72 7
CB208 Radiator fan #8 - Mo73 8
2.7 MULTIPLEX FUSES
The multiplex outputs are protected in current by
an internal “soft-fuse”. Each output has
programmed specific maximum amperage.
When an output is shorted, the current gets
above the limit and the soft-fuse intervenes to
turn the output OFF. The output stays OFF until
the "soft-fuse" is reset.
Turn the ignition key to the OFF position and
turn to the ON position again. This resets all
"soft-fuses".
There is also hardware fuses used to protect the
incoming power to the multiplex modules. These
fuses are located inside the VECF (Vehicle
Electrical Center Front) and VECR (Vehicle
Electrical Center Rear).
2.8 RELAYS
Relays are used to automatically energize or de-
energize a circuit from a remote location. The
relay draws a very low current to energize its
coil. Once the coil is energized, it develops a
magnetic field that pulls a switch arm closed or
open, to either energize or de-energize a given
component. As the control current required for
the coil is very low, the relay allows a remote
station to control a high energy circuit without
running great lengths of costly high capacity
cable, and also eliminates the need for high
amperage switches and heavy connectors.
86 coil
85 coil
30 common feed
87 normally open contact NO
87A normally closed contact NC
FIGURE 4: SINGLE POLE DOUBLE THROW RELAY
NOTE
Each relay is identified with “12V” or “24V”
printed on its casing in orde
r to identify the
coil operating voltage.
CAUTION
The Multiplex vehicle uses a VF4 relay
specially designed for Volvo that has different
internal characteristics than the c
urrent VF4
relay. It is important to use only the new part
marked Volvo as a
replacement in Multiplex
vehicles. Regular relays have an inadequate
lifespan for Multiplex vehicles.

PREVOST X3-45 COMMUTER Specifications

General

Engine	Volvo D13
Transmission	Allison B500
Fuel Type	Diesel
Length	45 ft (13.7 m)
Width	102 in (2.6 m)
Horsepower	500 hp
GVWR	54, 000 lbs
Height	141 in