Smith-Root GPP 2.5 - Check Rotor Windings

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USER’S MANUAL
www.smith-root.com
Procedure 4: Check Rotor Windings
Figure 4.1
Figure 4.2
Figure 4.3
PROBLEM: no output from gpp electrofisher (cont.)
• Disconnect yellow wires from the brush end cap and the
Rectier. (See Fig. 4.1).
• Measure resistance with ohmmeter between rotor slip
rings, through the Brushes. Brushes are accessible via the
brush end-caps. (See Fig. 4.2).
Resistance should read as follows:
≈24 ohms – 2.5 GPP
≈32 ohms – 5.0 GPP
≈36 ohms – 7.5 and 9.0 GPP
If resistance varies signicantly from above, take mea-
surements directly from the slip rings.
• Check Rotor Slip Rings to ground (OPEN connection).
(See Fig. 4.3). Replace rotor if measurements are out of
specications.
Go to procedure 5.
Fig. 4.1
Fig. 4.2
Fig. 4.3
ADVANCED TROUBLESHOOTING