Measurement 7 (Electric Motor To Power Electronics)

WARNING: This page is about a different variant/trim than selected.

WARNING: Incorrect handling of high-voltage components

Electric shock
Short circuit
Fire
Explosion
→ Only appropriately trained and authorized persons may work on high-voltage vehicles and components.

→ Required qualification: High voltage technician or high voltage expert.

→ Observe national requirements and legislation for this work.

→ Always use insulated tools, such as an > VAS 6883 - insulated tool set when working on these parts.

→ Observe general warning notices for working on the high-voltage system.

> 2X00IN GENERAL WARNING NOTICES FOR WORKING ON THE HIGH-VOLTAGE SYSTEM

Preliminary work for measurement 7 (electric motor to power electronics)

Unscrew cover on connection for 3-phase line to electric motor.
> 279319 REMOVING AND INSTALLING HIGH-VOLTAGE LINE FROM POWER ELECTRONICS TO ELECTRIC MOTOR

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Electric machine
Use insulation tester > VAS 6838 - Insulation tester to measure the resistance at the 3-phase line for the electric motor housing.
Measure all 3 high-voltage lines individually.

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Measurement 7
Perform measurement 7.
1. 3.1 Setpoint value > 550 MOhm
Evaluate test results.
1. 4.1 If the measured value is within the tolerance range, repeat measurement.
  Contact Technical Support.
2. 4.2 If the measured value is outside of the tolerance range, continue with measurement 7.1
  Preliminary work for measurement 7.1 (electric motor to 3-phase line)
Remove cover for front underbody.
> WM, 519219 REMOVING AND INSTALLING COVER FOR FRONT UNDERBODY
Remove front-axle support.
> 400819 REMOVING AND INSTALLING FRONT-AXLE SUPPORT
Disconnect electric connections (12-volt) at the power electronics.
Loosen power electronics holder.
> 279119 REMOVING AND INSTALLING POWER ELECTRONICS FOR HIGH-VOLTAGE SYSTEM
Loosen threaded joint for high-voltage lines from power electronics to electric motor and disconnect all 3 high-voltage lines.

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

High-voltage lines from power electronics to electric motor
Use insulation tester > VAS 6838 - Insulation tester to measure the resistance at the 3-phase line for the electric motor housing.
Measure all 3 high-voltage lines individually.

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Measurement 7
Perform measurement 7.1.
1. 11.1 Setpoint value > 550 MOhm
Evaluate test results.
1. 12.1 If the measured value is within the tolerance range, replace power electronics.
  After replacing the power electronics, repeat measurement 7.
2. 12.2 If the measured value is outside of the tolerance range, continue with measurement 7.2
  Preliminary work for measurement 7.2 (3-phase line)
Loosen 3-phase line to the electric motor.
> 279319 REMOVING AND INSTALLING HIGH-VOLTAGE LINE FROM POWER ELECTRONICS TO ELECTRIC MOTOR
Use insulation tester > VAS 6838 - Insulation tester to measure the resistance at the terminal shoes of the 3-phase line -1- .

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Measurement 7.2

Measure all 3 high-voltage lines individually.
Perform measurement 7.2.
1. 15.1 Setpoint value > 550 MOhm
Evaluate test results.
1. 16.1 If the measured value is within the tolerance range, continue with measurement 7.3
2. 16.2 If the measured value is outside of the tolerance range, replace 3-phase line.
  Fit new fastening screws for 3-phase line to electric motor.
  
  After replacing the 3-phase line, repeat measurement 7.
  
  Preliminary work for measurement 7.3 (electric motor)
Fit a 4-mm washer under the fastening screws for the 3-phase line and screw in fastening screws on electric motor.
Tightening torque for screw: 20 Nm (15 ftlb.)

Fit new fastening screws before final re-installation.
Use insulation tester > VAS 6838 - Insulation tester to measure the resistance at the fastening screw for the electric motor housing.

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Measurement 7.3

Measure all 3 high-voltage connections individually.
Perform measurement 7.3.
1. 19.1 Setpoint value > 550 MOhm
Evaluate test results.
1. 20.1 If the measured value is within the tolerance range, repeat measurement.
  Contact Technical Support.
2. 20.2 If the measured value is outside of the tolerance range, replace electric motor.
  After replacing the electric motor, repeat measurement 7.