CUMMINS QST30 - 1. Introduction; Manual Overview and Service Information

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Copyright  2017 Cummins Inc.
1. Introduction
ABOUT THIS MANUAL
This manual provides troubleshooting and repair in-
formation regarding the PowerCommand

Control
3100 (PCC) and alternators for the generator sets
listed on the front cover. Engine service instructions
are in the applicable engine service manual. Oper-
ating and maintenance instructions are in the appli-
cableOperator’s Manual.
This manual does not have instructions for servic-
ing printed circuit board assemblies. After determin-
ing that a printed circuit board assembly is faulty, re-
place it. Do not repair it. Attempts to repair a printed
circuit board can lead to costly damage to the equip-
ment.
This manual contains basic (generic) wiring dia-
grams and schematics that are included to help in
troubleshooting. Service personnel must use the
actual wiring diagram and schematic shipped with
each unit. The wiring diagrams and schematics that
are maintained with the unit should be updated
when modifications are made to the unit.
Read Important Safety Instructions and carefully
observe all instructions and precautions in this
manual.
TEST EQUIPMENT
To perform the test procedures in this manual, the
following test equipment must be available
 True RMS meter for accurate measurement of
small AC and DC voltages. Fluke models 87 or
8060A are good choices.
 Grounding wrist strap to prevent circuit board
damage due to electrostatic discharge (ESD).
 Battery Hydrometer
 Jumper Leads
 Tachometer or Frequency Meter
 Wheatstone Bridge or Digital Ohmmeter
 Variac
 Load Test Panel
 Megger or Insulation Resistance Meter
 PCC Service Tool Kit (Harness Tool and Sen-
sor Tool)
HOW TO OBTAIN SERVICE
Always give the complete Model, Specification and
Serial number of the generator set as shown on the
nameplate when seeking additional service infor-
mation or replacement parts. The nameplate is lo-
cated on the side of the alternator output box.
WARNING
Incorrect service or replacement of
parts can result in severe personal injury or
death, and/or equipment damage. Service per-
sonnel must be trained and experienced to per-
form electrical and mechanical service. Read
and follow Important Safety Instructions, on
pages iii and iv.