central electric units general information

Central electric units
General information
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1. Main central electric unit P22. P9 bodywork central electric unit3. Chassis central electric unit P114. Chassis central electric unit P8

More information is found in the following documents:• Work involving the main central electric unit P2• Work involving the P9 bodywork central electric unit• Work involving the chassis central electric unit P11• General information on the bodywork console• Work involving the bodywork console• Earthing and power supply• Work involving cables and lead throughs

General informationThis document contains information on the four central electric units found in the ve-hicle:

WARNING!No work may be carried out in the chassis central electric unit P8.

Note:In the first instance, use the bodywork central electric unit P9 if bodywork functions are to be connected to the vehicle’s electrical system.

Designation Designation PositioningCentral electric unit P2 In the cab, in front of the passen-

ger seat, under the instrument panel behind the protective cas-ing

Bodywork central electric unit

P9

Chassis central electric unit

P11 On the chassis between the bat-tery box and left-hand front mudguard

P8

Scania Truck Bodybuilder 22:10-666 Issue 5 2019-08-14© Scania CV AB 2019, Sweden 1 (19)

General information


ntral electric unit P9gnation F7-F12ntral electric unit P9gnation F1-F6ntral electric unit P9gnation G70nsoleb

489, position 13nsolec

489, position 14nsoled

arness connector C489, position 12

Connection designations for different supply volt-agesObtain the supply voltage in the first instance from the bodywork central electric unit P9 or the bodywork console.

Terminal designationa

a. Standard designations in accordance with DIN 72 552.

Description Connection15 Supply voltage with starter lock in the drive

positionBodywork cePosition desi

30 Supply voltage directly from the battery Bodywork cePosition desi

31 Ground Bodywork cePosition desi

58 Supply voltage for parking light Bodywork co

b. Supplied via fuse number 108 in the P2 main central electric unit.

Connector C61 Supply voltage for alternator charging Bodywork co

c. Supplied via fuse number 192 in the P2 main central electric unit.

Connector CRA Supply voltage for radio mode Bodywork co

d. Voltage supplied via starter lock.

Harness-to-h


Bodywork central electric unit P9


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Bodywork central electric unit P9The bodywork central electric unit supplies the vehicle’s bodywork equipment with electric power.

Note:In the first instance, use the bodywork central electric unit P9 if bodywork functions are to be connected to the vehicle’s electrical system. If the required current uptake is greater than the one the bodywork central electric unit is dimensioned for, the sup-ply voltage must be taken from the P11 chassis central electric unit.

More information on the bodywork central electric unit is found in the document Work involving the bodywork central electric unit P9.

More information on cables between the cab and frame is found in the following doc-ument:

• Bodywork interface• Work involving cables and lead throughs• Cable harness for bodywork functions




3060 A

1530 A

2620

016

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Fuse and relay labelThere is a label on the rear of the panel at the end of the instrument panel facing the passenger door (part number 2 620 016). The label contains the following informa-tion on fuses and relays in the bodywork central electric unit:

• Position connections• Type of supply voltage• Maximum permitted total amperage for each type of supply voltage

Note:List all new installations on the sticker.




Fuses and relaysApart from the ground connection and voltage supply from the main central electric unit, the P9 bodywork central electric unit has no factory-fitted electrical connec-tions. An exception to this is if the vehicle is fitted with options such as a tail lift or FMS (Fleet Management System). The bodywork console is then configured with connections for these options in the factory.

The following types of supply power can be obtained from the bodywork central electric unit:

• 15 voltage, supply power when the starter lock is in drive• 30 voltage, supply power direct from the battery’s positive terminal

More information can be found in the document “Working with the P9 bodywork central electric unit”.


Main central electric unit P2


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Main central electric unit P2The main central electric unit supplies the vehicle’s equipment with electric power. For example, it provides the bodywork central electric unit P9 with supply voltage.

Note:In the first instance, use the bodywork central electric unit P9 if bodywork functions are to be connected to the vehicle’s electrical system. If work must be carried out in the main central electric unit, the bodybuilder must follow the instructions in the doc-ument Work in the main central electric unit P2.

More information is found in the document Work involving the main central electric unit P2.




OBD

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Fuse and relay labelThere is a sticker on the inside of the protective casing that covers the central electric units in the cab (part number 2 789 146). The label contains the following informa-tion on fuses and relays in the main central electric unit:

• Designations for fuses and relays• Rated current• Application

Note:The label shows the designations of the fuses and relays. The location of the fuses and relays may differ between different vehicles depending on specification.




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1. ATO fuses, 30 voltage2. ATO fuses, 15 voltage3. ATO fuses, 12 V 4. ATO fuses, 58 voltage5. ATO fuses with cables in both ends and no voltage supply from busbar6. Maxi fuses7. Power relays8. Micro relays9. Standard relays

Fuses and relaysFuses and relays within a group can have either fixed or floating positions. Floating positions are where the positions of the fuses and relays vary depending on the vehi-cle’s specification. However, the fuses and relays are always positioned in numerical order and are grouped based on their function, see figure.

More information about the main central electric unit’s fuses and relays can be found in the document “Working with the P2 main central electric unit”.


Chassis central electric unit P11


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Chassis central electric unit P11The chassis central electric unit P11 is positioned on the chassis between the battery box and left-hand front mudguard. The vehicle’s main fuses are positioned in the chassis central electric unit and are of mega fuse type with rated current 40-250 A. For example, power cable harnesses from batteries, the starter motor and any body-work functions are connected to this chassis central electric unit.

Note:In the first instance, use the P9 bodywork central electric unit if bodywork functions are to be connected to the vehicle’s electrical system. If the required current uptake is greater than the one the bodywork central electric unit is dimensioned for, the sup-ply voltage must be taken from the P11 chassis central electric unit.

More information can be found in the document “Working with the P11 central elec-tric unit”.


Fuses


PositioningP9 bodywork central electric unit and P2 main central electric unitMain central electric unit P2Chassis central electric unit P11

FusesThe following fuse types can be purchased from Scania dealers. More information can be found under the heading Part information.

Fuse type Cable terminals Fuse sizeATO fuse Flat socket, size 2.8 2-30 AMaxi fuse Flat socket, size 6.3 40-60 AMega fuse - 40-200 A


Fuses


Fuses are to be dimensioned in accordance with the consumers’ current require-ments. Under continuous loading, the current through the fuse should not exceed 70% of the fuse’s rated current.

The following table shows rated current and maximum continuous loading for some selected fuse sizes:

WARNING!Always use the correct fuse. An oversized fuse can cause damage or fire in the elec-trical system.

IMPORTANT!

Cable cross-sections, cable lengths and ambient temperature affect the maximum possible continuous current uptake.

Rated current, A Continuous current, A5 3.510 720 1430 2160 42100 70150 105200 140250 175


Relays


Positioningoading for resistive/ohmic load:3°C5°C25°Cf 4 A for capacitive load/lamp loadf 1 A for inductive load

Bodywork central electric unit P9 and main central electric unit P2

oading for resistive/ohmic load:5°C25°Cf 7 A for capacitive load/lamp loadf 1 A for inductive load

Main central electric unit P2 and bodywork console

0 A for resistive/ohmic load and inductive loadf 18 A for capacitive load/lamp load

Main central electric unit P2 and bodywork console

RelaysThe following relay types can be purchased from Scania dealers. More information can be found in the section Load types and “Part information”.

Relay type Cable terminals Load

Micro relay

Flat socket, size 2.8 for connection positions 1, 2 and 4

• Maximum l– 30 A at 2– 25 A at 8– 10 A at 1

• Maximum o• Maximum o

Flat socket, size 6.3 for connection positions 3 and 5

Mini relay

Flat socket, size 6.3 for all connection positions • Maximum l– 35 A at 8– 15 A at 1

• Maximum o• Maximum o

Power relay


• Maximum 4• Maximum o



Relays


Load typesResistive/ohmic load:The current is approximately the same from switch-on through to switch-off, for ex-ample when a heater element is switched on.

Inductive load:The inrush current increases to rated current with a slight delay and then levels out again in certain cases, for example when a magnetic contact is activated. The delay depends on the structure of the induced magnetic field.

On switch-off, a voltage of up to several thousand volts can be produced, subse-quently resulting in arcing between any relay contacts that are still open.

Capacitive load/lamp load:The inrush current for a capacitive load or a lamp may reach up to 10 times the rated current and then level out at the rated current level.


“Part information”


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“Part information”ATO fusesPart Part number DATO fuse 2 Aa

a. Fuse holders in the same colours are missing but all ATO fuse holders fit.

382 324 GATO fuse 5 A 382 325 OATO fuse 7.5 Aa 382 326 BATO fuse 10 A 382 327 RATO fuse 15 A 382 328 BATO fuse 20 A 382 329 YATO fuse 25 Aa 382 330 WATO fuse 30 A 382 331 GATO fuse holder 5 A 2 085 459 OATO fuse holder 10 A 2 168 059 RATO fuse holder 15 A 2 328 692 BATO fuse holder 20 A 2 168 060 YATO fuse holder 30 A 2 168 061 G




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Mega fuses

Maxi fuses

Part Part number DMega fuse 40 A 2 396 116 BMega fuse 60 A 2 396 117Mega fuse 80 A 2 442 795Mega fuse 100 A 2 442 796 YMega fuse 125 A 2 442 797 LiMega fuse 150 A 2 442 798 OMega fuse 200 A 2 442 809 B

Part Part number DMaxi fuse 40 A 477 780 OMaxi fuse 60 A 477 782 BMaxi fuse holder 40 A 2 667 915 OMaxi fuse holder 60 A 2 085 460 B




RelaysPart Part numberMicro relay 1 493 046Mini relay 2 077 837Power relay 2 420 827Micro relay holder 2 085 456Mini relay holder 2 085 457Power relay holder 2 085 458Locking device for micro relay holder 2 199 818Locking device for mini relay holder 2 199 820Locking device for mini relay 2 379 187Locking device for power relay holder 2 199 819




DescriptionCable cross-section 0.5–1.0 mm2

Cable cross-section 1.5-2.5 mm2

Cable cross-section 0.5–1.0 mm2




Cable cross section 6.0-10.0 mm2

Cable terminalsPart Part numberCable terminal, flat socket, size 2.8 815 658

815 659Cable terminal, flat socket, size 6.3 815 650

815 651815 652

Cable terminal, flat socket, size 9.5 1 536 8381 536 839




escriptionCable diameter 12.5-16 mmOutput, starter motor in P11Cable diameter 12.5-16 mmOuter dimensions of the bush: 30 mm input and output in P11Cable diameter 6.5-8 mmOuter dimensions of the bush: 25 mm inputs and outputs in P11Cable diameter 8.5-12 mmOuter dimensions of the bush: 25 mm inputs and outputs in P11

escription bodywork central electric unitain central electric unit P2

Bushes for P11 chassis central electric unit

Fuse and relay labels

Part Part number DBush 2 353 869 •

•2 353 845 •

•2 353 734 •

•2 353 771 •

•

Part Part number DFuse and relay label 2 620 016 P9

2 661 454 M




escriptionr cable terminal 815 652r cable terminal 815 650r cable terminals 815 651 and 815 659

r cable terminal 815 658r cable terminal 1 536 839

r cable terminal 1 536 838r cable terminals 815 650, 815 651, 815 652, 815 658 and 815 659r cable terminals 1 536 838 and 1 536 839

ToolsPart Part number DHand crimping tool 588 202:6 Fo

99 491:A Fo588 202:2,5 Fo99 493:B588 203:1 Fo588 208 together with Press squab cushion 2 636 61

Fo

2 766 871 FoPin removal tool 99 585 Fo

2 295 733 FoTool kit for panels 588 390 -


central electric units general information

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