Deenergize high-voltage on-board electrical system/put high-voltage on-board electrical system into operation

AR47.70-P-1000RFW

Deenergize high-voltage on-board electrical system/put high-voltage on-board electrical system into operation

27.11.2019

Engine

780 in model 253.992/993

S7

High-voltage disconnect device

 Danger

Risk of explosion caused by escaping hydrogen or overheating of the fuel tanks when working on the hydrogen system. Risk of frostbite to body parts caused by escaping gas and by touching component parts carrying gas when emptying fuel tanks. Risk of asphyxiation caused by inhalation of air diluted by hydrogen. Risk of burn injuries by coming into contact with an invisible pale blue hydrogen flame.

AS00.00-Z-0030-01B

 Danger

Risk of death when working on component parts and systems with U >= 30 V alternating voltage (AC) or U >= 60 V direct voltage (DC)

Do not touch damaged or defective live component parts and lines or non-insulated electrical connections and lines.

AS00.00-Z-0035-01A

Topical note

Notes on fuel cell system

AH00.00-P-0022-01RFW

Topical note

General information on handling vehicles with high-voltage on-board electrical system and/or lithium-ion battery and/or gaseous-fuel drive system

AH00.00-Z-0300-01A

Topical note

Information on preventing damage to electronic components due to electrostatic discharge

AH54.00-P-0001-01A

Topical note

Notes on battery

AH54.10-P-0001-01A

Notes on safety-relevant components

AH00.00-Z-0019-01A

Power disable

1

Ensure that the requirements for driving into the workshop are fulfilled.

Topical note

Requirements for driving into the workshop

AH00.00-P-0021-01RFW

2

Print out "tank system, fuel cell, form event log," fill out, and attach to the vehicle somewhere clearly visible.



OF00.00-P-3000-21RFW

3

Connect vehicle diagnosis system and perform quick test of control units.



AD00.00-P-2000-04B

4

Perform power disable process with vehicle diagnosis system.



AD00.00-P-2000-04B

 Fully process the following menu item in the "Control units" entry menu:
High voltage on-board electrical system 
High-voltage on-board electrical system disable

 The work procedure for the disabling is stored in the following control units:
Battery management system control unit (N82/2)
Power electronics control unit (N129/1)



If power disable process cannot be performed with vehicle diagnosis system,



Manually deenergize high-voltage on-board electrical system

AR47.70-P-1010RFW

5

Actuate high-voltage disconnect device (S7), as shown in picture sequence (A, B, C), and secure with a shackle-type lock.

 Keep the key for the shackle-type lock of the high-voltage disconnect device (S7) in a separate location accessible to authorized personnel only.

6

Print out power disable event log and sign.

7

Place power disable event log in an easily visible location in the vehicle.

Initial startup

8

Perform commissioning with vehicle diagnosis system.



AD00.00-P-2000-04B

 Fully process the following menu item in the "Control units" entry menu:
High voltage on-board electrical system 
High-voltage on-board electrical system initial startup

 The work procedure for the commissioning is stored in the following control units:
Battery management system control unit (N82/2)
Power electronics control unit (N129/1)

 Document, print out and sign the proper threaded connection of all high-voltage direct screw connections as part of the high-voltage on-board electrical system commissioning.

9

Check high-voltage disconnect device (S7) for damage.

If damage is present,



Remove contacts from coupling housing of high-voltage disconnect device (S7) and replace high-voltage disconnect device (S7).

AR00.19-P-0120-31A

 New passenger car wiring harness repair kit

*220589049900

 Unlocker with ejector MLK 1.2_plug

*220589019925

 Wiring harness repair kit, basic

*000589139900

10

Remove shackle-type lock and connect high-voltage disconnect device (S7) as shown in picture sequence (D, E, F).


Carefully connect high-voltage shutoff device (S7).
Otherwise, the high-voltage disconnect device (S7) may be damaged.

11

Print out commissioning event log and sign.

12

Disconnect diagnostic system.



AD00.00-P-2000-04B

13

Place commissioning event log and power disable event log in order folder.