2f3e5fd0

7.3.3.7. Check of a rotor

Check whether there is no break in an excitement winding.

Fig. 7.23. Check of resistance between contact rings


By means of an ohmmeter measure resistance between contact rings (fig. 7.23).
Nominal resistance (in a "cold" state): 2,7–3,1 Ohms.
If resistance strives for infinity, i.e. the chain is opened, then replace a rotor.

Fig. 7.24. Check of short circuit of a winding of excitement on "weight"


Check whether there is no short circuit of a winding of excitement on "weight" (fig. 7.24).
By means of an ohmmeter measure resistance between a pole of a rotor and a contact ring.
If resistance is equal 0 (the chain is closed), then replace a rotor.