Marathon Electric Pancake Spécifications télécharger pdf (Page 4)

OPERATION

Initial Start-up

a. Carefully inspect the generator before start-up. Check

all electrical connections, and ensure that all bolts have

been securely fastened.

b. Rotate the shaft. The shaft and rotor assembly should

turn freely. Do not use the fan as a fulcrum to bar

over the unit.

c. Start engine. See the engine manufacturer’s operating

manual for proper engine starting procedures.

d. Check vibration. If excessive, check all mechanical

connections.

e. The generator voltage is adjusted at the factory to a

specified speed; however, it is advisable to verify upon

installation.

GENERATOR SPEED

Rating No Load rpm Minimum Full Load rpm

60 Hz 1800 – 1850 1800 less 1%

50 Hz 1500 – 1550 1500 less 1%

f. Observe and record the generator voltage at no load

and at full load. Immediately after start-up (cold) and

after 30 minutes of full load (hot). The voltage is easily

adjustable by adjusting the engine speed. The voltage

will increase as the generator rpm is increased.

g. If voltage cannot be adjusted, see the section on

TROUBLE SHOOTING, page 6.

h. Check the temperature rise after running for 30 minutes

at full load. If excessive, examine the generator for the

following:

1. Obstructed air flow

2 Hot air feeding into the inlet of the generator

3. Bypassed air (air not pulled through generator)

i. Examine ratings and actual load applied to determine if

the generator rating may be too low for the load applied.

The ambient temperature

must not exceed 40°C.

(104°F). For operation at higher ambient temperatures,

reduce the generator kW rating 1% for each degree

above 40°C. For operation at high altitudes, reduce

the generator kW rating 2% for each 1000 ft above sea

level.

Frame temperatures above 60

°C. (140°F) are too high,

indicating a temperature rise in the copper windings of

105

°C (121°F) or more.

Capacitor Excitation/Voltage Regulation

A single capacitor is used to regulate the voltage to within

5% of the rated load. Use extreme caution when handling

capacitors. The capacitor will still contain high voltage even

after the engine has stopped operating.

Always discharge the capacitor before handling. Use an

insulated conductor (jumper wire) or a screw driver with

an insulated handle to short across the capacitor terminals,

and discharge the capacitor prior to handling.

MAINTENANCE

Periodic Inspection

Clean and inspect generator after every 200 hours of

normal operating time. If the generator is housed in a harsh

environment, it is advisable to clean and inspect the unit

more frequently. If dirt and grease is allowed to build-up,

the generator will run hotter, lose efficiency, and reduce

the life of the generator.

Remove pot cover to examine the rotor, shaft, and bearing

for excessive wear. Replace the bearing after 10,000 hours

of normal operating time or sooner if wear is evident.

Cleaning

Remove all dust, dirt, and oil and grease build-up from

external surfaces. Use a low-pressure air hose (25-psi

maximum) to blow dirt and grease from the internal

components through the fan opening. Clean inside the

control box. Check for loose or damaged lead wires and

loose components mounted in the box.

NOTE: Do not remove any internal generator parts or

warranty is void.

SERVICE

Flashing the Rotor - Refer to Figures 2 and 3

NOTE: Do not run the generator during this operation.

a. Disconnect all incoming power leads to the generator.

b. Connect the (+) lead of a 12 volt battery to the “R”

connection.

c Connect the (–) lead of the battery to the rotor shaft.

d. Disconnect battery leads.

e. Check the generator no load terminal voltage. It should

be within ±10% of rated value.

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

1 2 3 4 5 6 7 8

Commentaires sur ces manuels

Pas de commentaire

Marathon Electric Pancake Spécifications Page 4

Commentaires sur ces manuels

Produits connexes et manuels pour Générateurs d'électricité Marathon Electric Pancake