TROUBLE- SHOOTING

ELECTRICAL COMPONENT SPECIFICA- TIONS

Note: See engine owner’s manual for engine troubleshooting.

WARNING

Only a qualified electrical service person should service and repair generator. Use only factory approved replacement parts.

OBSERVED

POSSIBLE

 

 

 

 

 

 

 

PROBLEM

 

CAUSE

 

 

REMEDY

 

 

 

 

 

 

 

 

 

 

 

 

 

No voltage when

1.

Defective capacitor

 

1.

Replace capacitor

starting generator

2.

Winding short circuit

2.

Check resistance of coils (see

with no electrical

 

or loose connections

 

Electrical Component Speci-

load

 

 

 

 

 

 

 

 

 

 

fications, below)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3.

Defective rotor diode

3.

Replace both diodes on rotor

 

 

4.

Loss of residual

 

4.

Apply 12-volt battery to

 

 

 

magnetism

 

 

capacitor terminals for 2-3

 

 

 

 

 

 

 

 

seconds

 

 

 

 

 

 

 

 

 

 

 

 

 

Voltage is less than

1.

Engine speed too low

1.

Set engine speed to 3720

normal voltage with

 

 

 

 

 

 

RPM (62 Hz) with no load

no electrical load

2.

Clogged spark

 

2.

Clean arrester. See engine

 

 

 

 

 

 

arrester

 

 

 

owner’s manual

 

 

 

 

3.

Defective rotor diode

3.

Replace both diodes on rotor

 

 

4.

Partial short circuit in

4.

Check resistance of coils (see

 

 

 

winding

 

 

 

Electrical Component Speci-

 

 

 

 

 

 

 

 

fications, below)

 

 

 

 

5.

Defective capacitor

 

5.

Replace capacitor

 

 

 

 

 

 

 

 

 

 

 

Voltmeter reading

1.

Engine speed too high

1.

Set engine speed to 3720

more than 10% high

 

 

 

 

 

 

RPM (62 Hz) with no load

with no electrical

 

 

 

 

 

 

 

 

 

 

 

load

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Voltmeter reading

1.

Defective rotor diode

1.

Replace both diodes on rotor

correct with no

2.

Electrical load too high

2.

Do not overload generator

electrical load, but

3.

Engine not running

 

3.

Contact an authorized

more than 10% low

 

 

properly

 

 

 

engine service center

when electrical load

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

is added

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Resistance in Ohms

 

 

 

 

 

 

 

 

Stator

 

Stator

 

Rotor

 

Rotor

Capacitor,

 

 

 

 

Main

Auxiliary

 

Primary

Secondary

MFD

 

Diodes (2)

 

Model

Winding *

Winding Δ

 

Winding †

Winding †

450 Volt

 

800 Volt

 

 

 

 

 

 

 

 

 

 

 

 

 

MGY5000

0.54

 

1.38

 

0.61

 

2.29

50

 

70 Amp

 

 

 

 

 

 

 

 

 

 

 

 

 

 

*Connect T2 (green) and T3 (black). Measure resistance between T1 (red) and T4

(yellow).

Δ Resistance between brown and white leads.

† Remove diodes to check resistance.

27

Page 27
Image 27
Master Lock MGY5000 installation manual TROUBLE- Shooting, Observed Possible, Cause Remedy

MGY5000 specifications

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