Table 5-1. Troubleshooting (Contd)
TEST OR INSPECTION
Model MEP-023A. With generator set operating at 3428 rpm, remove the screw in the
face of the frequency converter and adjust the potentiometer for a reading of 400 HZ on
the frequency meter. If proper reading is not obtained, proceed as follows:
Disconnect the lead from the positive ( + ) and negative (-) terminals on the frequency meter.
Attach a multimeter with the scale set to read at least 200 microamperes, to the + and terminals on the
Operate generator set at 3428 rpm and turn adjusting screw to obtain a 100 microamperes on the multimeter
If reading is accomplished, the frequency meter on the control panel is faulty and must be replaced.
If reading of 100 microamperes cannot be obtained, disconnect the wire leads from the two L terminals on
the frequency converter. Test the wire leads. If no defect is discovered, replace frequency converter (below) and
operate generator set. Turn adjusting screw to obtain 400 HZ reading.
If frequency meter does not pass the above test, replace it. Refer to figures 4-61 or 4-62
and replace the meter to the applicable model generator set.
Section III. GENERAL MAINTENANCE
Refer to Chapters 2, 3 and 4 for preventive
maintenance checks and services and service to the
General Disassembly Procedures
disassembled to the extent required for complete
Serviceable, precision, matched or mated parts
shall be marked, handled and stored to preclude damage
and to insure reassembly and installation in their
matched and mated positions in the same assembly or
General Repair and/or Replacement Criteria
In-process inspection shall be performed on
each assembly, subassembly and component parts
being repaired to insure strict adherence to criteria
established by this manual.
Welding shall assure complete fusion and
penetration and be in compliance with specifications and
standards referenced herein.
General Reassembly Procedures
General precautions shall be adhered to during
reassembly to insure that all internal parts have been
properly installed and necessary tolerance checks
Change 8 5-18