Robin America RGX240 Specifications download pdf (Page 38)

9-3 BRUSHES

The brushes must be smooth where they contact the slip

rings. If not. polish the brushes smooth with sandpaper. X

brush that is not smooth produces arcs between the brush

and slip ring leading to possible damage. Usable brush lengths

are from 5mm to ljmm as shown in Fig. 9-3. .a brush

shorter than 5mm must be replaced because decreased con-

tact pressure between the brush and slip ring lowers genera-

tor efficiency and output voltage.

15mm

- 5mm

Fig. 9-4

9-4 AUR (AUTOMATIC VOLTAGE REGULATOR)

AVR trouble may be identified -by simply looking at the AVR, or by checking the inter-lead resistance with a tester. or actu-

ally mounting it in the generator and operating it.

9-4-l AUR TROUBLE IDENTIFICATION by APPEARANCE

If an AVR electronic part is burnt dark. or the surface epoxy resin melted, it often indicates .r\VR trouble.

9-4-2 IDENTIFYING AUR TROUBLE by CHECKING

INTER-LEAD RESISTANCE

Check the inter-lead resistance of the AVR with a tester.

(See Fig. 9 -5 .)

If the tester readings vary greatly from the

values specified in the Table 9-I. rhe AVR is faulty.

NOTE: Take tester inaccuracy in to account in reading the tester.

TESTER

Fig. 9-5

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1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 64 65

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Robin America RGX240 Specifications Page 38