Smith-Root GPP 2.5 - Page 33

33
GPP ELECTROFISHER
ADVANCED TROUBLESHOOTING
www.smith-root.com
PROCEDURE 5: CHECK STATOR WINDING - EXCITER RESISTANCES
• Check wire number tags. Label with tape and pen if missing.
• Cut wires at crimp connectors.
• Strip insulation back 1/4” ≈ (0.5 cm) to expose bare wire.
• Test winding pairs (1 & 2, 3 & 4, 5 & 6, 7 & 8, 9 & 10, 11 & 12,) (See
Fig. 5.1)
• Test yellow exciter wires (See Fig. 5.3) according to table below:
• Test 12 Volt winding pairs (White/White, Black/Black). Each should
measure ≈0.1 Ohms (See Fig. 5.2).
• Check insulation of all windings to ground (open connection). (See
Fig. 5.4.)
• Replace Stator if out of specifications.
Ω
Figure 5.2
1
2
3
4
5
6
1&2
3&4 5&6
7
8
9
11 10
12
9&10 11&12
7&8
Figure 5.1
5.0, 7.5 & 9.0
≈
0.4 Ohms
≈
1.2 Ohms
2.5
GPP Model
Ω
5.0, 7.5 & 9.02.5
≈2.0Ω
≈4.0Ω
≈2.0Ω
≈1.7Ω
≈1.7Ω
≈3.4Ω
GPP Model
66&55
77&55
66&77
Exciter
Wires
�
Fig. 5.1
Fig. 5.2
Fig. 5.4
Rotors and end bearings should be replaced as a set. Replace
rotor bearing support bracket if old type. Contact Smith-Root,
Inc. for further information.
66
77
55
Figure 5.3
Fig. 5.3
EXCITER WINDING RESISTANCES
2.5 GPP:
66-77
55-66
≈ 1 Ohm
55-77 ≈ 1.5 Ohm
5.0 - 7.5 GPP:
55-77 ≈ 1 Ohm
9.0 GPP
55-77 ≈ 1.1 Ohm
SLIP RINGS
2.5 GPP:
≈ 3 Ohm
5.0, 7.5, & 9.0 GPP:
≈ 12 Ohm
STATOR WINDINGS
(1-2 3-4 5-6 etc.) (12V)
2.5
≈ 1.4 Ohm ≈ 0.3 Ohm
5.0 - 7.5
≈ 0.4 Ohm ≈ 0.1 Ohm
9.0
≈ 0.3 Ohm ≈ 0.1 Ohm
9.0 (110V winding) ≈ 1.3 Ohm