Atlas Copco — Measuring the alternator insulation resistance
Testing & diagnosis
From a Atlas Copco operator's manual covering: 1103A-33TG1, 1103A-33TG2, QAS 30 Pd, QAS 45 Pd, QAS 60 Pd, Qc1001, Qc3001. Check it applies to your exact model before use.
Applies to: Perkins 1103A-33TG1, Perkins 1103A-33TG2, Perkins 1103A-33G2 (QAS 30 Pd); 1103A-33TG1 (QAS 45 Pd); 1103A-33TG2 (QAS 60 Pd) engine
Procedure
- Use a 500 V megger.
- If the N-terminal is connected to the earthing system, disconnect it from the earth terminal. Disconnect the AVR.
- Connect the megger between the earth terminal and terminal L1 and generate a voltage of 500 V.
- The scale must indicate a resistance of at least 5 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
- At least 5 MΩ at 500 V
Full service-parts list: Perkins 1103A-33TG1 →, Perkins 1103A-33TG2 →, Perkins 1103A-33G2 (QAS 30 Pd); 1103A-33TG1 (QAS 45 Pd); 1103A-33TG2 (QAS 60 Pd) engine →
Source: Atlas Copco operator's 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.