Marathon Electric Pancake Spécifications télécharger pdf (Page 5)

f. If residual voltage is normal, the capacitor is defective

and should be replaced.

Checking Diodes

a. Check each diode individually by removing the (+) rotor

lead stud connection (see Figures 2 and 3). Diodes are

good if the resistance reading is approximately mid-

scale on the lowest ohm rating.

b. Check for leakage in each diode by reversing their

polarity. Diodes are good if the resistance reading is

infinite. A faulty diode will give a resistance value of zero.

c. Prior to installing a replacement diode, clean the surface

of the exciter rotor core, and run a bead of a thermal-

electrical compound around the base of the diode. The

diode threads should not be coated.

d. Torque the diode base to 20–30 in-lb. Do not over

torque the diode base

Ordering Parts

When ordering parts, always include the name and quantity

of each part along with the serial and model numbers from

the generator nameplate.

For parts ordering information, contact:

Marathon Electric Manufacturing Corporation

100 E. Randolph St.

P.O. Box 8003

Wausau, WI 54402-8003

Phone: 715.675.8257

or: 800.477.6362, ext. 8257

RETURNED GOODS

Consult Marathon Electric Manufacturing Corporation for

authorization before returning any product. We cannot be

responsible for any items returned without authorization.

CAUTION: Single bearing generators must have their

rotor assembly properly secured to prevent damage

during transit to the factory, or to an authorized service

center.

Checking the Capacitor Charge

a. Check the capacitor “charge and discharge” readings

using an ohmmeter on the RX-1000 scale.

b. Place the ohmmeter leads on the capacitor terminals

one at a time. A meter deflection should be seen

(charging), followed by a slow return to infinity

(discharging).

c. Reverse the ohmmeter leads and repeat the procedure.

The results should be the same. No meter deflection or

continuity indicates a defective capacitor. Replace the

device.

Figure 2

Figure 3

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Marathon Electric Pancake Spécifications Page 5

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