Katolight E6921M1 / REO2IMI — Insulation Test
Maintenance · Generator windings
For the Katolight E6921M1 / REO2IMI, from the Katolight service manual.
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Before you start
- To prevent damage to regulator and rotating rectifiers, isolate them during this test.
Procedure
- Isolate rotating rectifiers: for two-plate, jumper across mounting plates and exciter armature leads; for one-plate, jumper across PCBs and exciter armature leads.
- Identify, detach, and insulate lugs on all leads from generator to regulator; disconnect grounded neutral connection.
- Short-circuit secondary of current transformer.
- Attach 500 volt megohmmeter to frame and to ac power leads, then to F field; minimum 1.3 megohms.
- Repeat test on CF field if used.
- Restore circuit and remove jumpers if insulation checks are within limits.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Minimum insulation resistance 1.3 megohms
Source: Katolight service 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.