Atlas Copco QAS 500 Volvo / Qc1002 — Measuring the alternator insulation resistance
Testing & diagnosis
For the Atlas Copco QAS 500 Volvo / Qc1002, from the Atlas Copco manual.
Applies to: Volvo Penta TAD1641 GE engine, TAD 1641 GE engine
Procedure
- Disconnect the N-terminal from the earthing system if connected.
- Disconnect the AVR.
- Connect a 500 V megger between the earth terminal and terminal L1.
- Generate a voltage of 500 V and read the scale.
- Verify the scale indicates a resistance of at least 2 MΩ.
Tools required
- 500 V megger Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Minimum insulation resistance: 2 MΩ
Full service-parts list: Volvo Penta TAD1641 GE engine →
Source: Atlas Copco manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.