Miller 819A Manuale tecnico - Pagina 14

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SECTION 8 − TROUBLESHOOTING 7.5kW GENERATOR

8-1. Troubleshooting Table

To avoid charges that are not covered under warranty, troubleshoot and replace components as described. Warranty requests on equipment

that could have been repaired in the field or are misdiagnosed may be denied.

Inspect generator and repair or replace components or wiring that shown signs of physical damage.

Inspect stator winding for evidence of overheating. Do not return the generator unless indicated by the troubleshooting guide and factory au-

thorized service agent.

Do not return the control box. Troubleshoot to the circuit board level.

Trouble

No generator output at platform AC

receptacles.

Low generator output at platform AC

receptacles.

TM-268 819 Page 12

Be sure generator control switch is turned on at platform.

Check and secure electrical connections at platform, generator, and control box.

Be sure all equipment is turned off when starting unit.

Check circuit breaker CB1 for loose terminals. Check continuity across poles of CB1. Reset or replace

CB1 (see Section 4-2).

Check plug PLG3 connection and/or connections at receptacles RC2 and RC4.

Be sure enable voltage (+12 volts DC) is being supplied to control box.

Check slip rings, wiring to brushes, and brush position on slip rings. Install new brushes if indicated. See

Section 8-8.

Disconnect leads 12 and 13 from brushes, and check continuity across slip rings (nominal reading is 26

ohms). Replace generator if rotor is open.

Disconnect stator weld leads 1, 2, and 3 from circuit breaker CB1, and check continuity between leads.

Replace generator if indicated.

Disconnect plug PLG4 and check continuity between exciter leads 5 and 6. Replace generator if indicat-

ed.

Check power board PC1 and connections, and replace if indicated (see Section 8-4).

Check control board PC2 and connections, and replace if indicated (see Section 8-6).

Verify generator is running at 3600 rpm (60 Hz) or 3000 rpm (50 Hz).

If generator voltage is approximately 60 volts (instead of normal 230−240 volts AC), replace control board

PC2.

Check slip rings, wiring to brushes, and brush position on slip rings. Install new brushes if indicated. See

Section 8-8.

Disconnect leads 12 and 13 from brushes, and check continuity across slip rings nominal reading is 26

ohms). Replace generator if rotor is open.

Disconnect stator leads 1, 2, and 3 from circuit breaker CB1, and check continuity between leads. Repla-

ce generator if indicated.

Disconnect plug PLG4 and check continuity between exciter leads 5 and 6. Replace generator if indicat-

ed.

Check power board PC1 and connections, and replace if indicated (see Section 8-4).

Check control board PC2 and connections, and replace if indicated (see Section 8-6)..

See Section 8-2 for test points and values and

Section 11 and following for parts location.

Use MILLER Testing Booklet (Part No. 150 853)

when servicing this unit.

Remedy

Belt Driven Generator