Leroy-Somer — Checking a rotating diode
Testing & diagnosis · Rotating diodes
From a Leroy-Somer manual — check it applies to your exact model before use.
Procedure
- A good diode passes current only from anode to cathode.
- Test in both directions: the bulb stays dark one way and glows the other.
- Replace any diode that conducts in both directions.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Source: Leroy-Somer 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.