.
Section
7
-
Control
INTROD
UCTlO
N
The control svstem includes all functions that relate
A
general description of each component and how it
functions follows:
to starting, monitoring for fault conditions, instru-
mentation, battery charging, and stopping. This sec-
tion covers how the control operates, where the com-
ponents are located, and basic troubleshooting pro-
cedures. Separate control systems are used for the
NHE and NHEL series generator sets. Each system is
covered separately in this section.
NHE CONTROL DESCRIPTION
The generator set control (see Figures
7-1
and
7-2)
consists of the following components:
Printed Circuit Board Assembly
Panel Mounted Start/Run/Stop Switch
(Sl)
Start Solenoid
(Kl)
Battery Charge Resistor (R6)
Optional Remote Start Control
Printed Circuit Board Assembly
The printed circuit board assembly (see Figure7-3) is
the center
of
the generator set control system. The
PC
board circuitry controls the start, starter discon-
necthun, stop, and battery charging functions. The
primary components of the
PC
board include three
relays, one power rectifier, two diodes, one capacitor,
five resistors, and a five ampere fuse. The
only
ser-
viceable component is the fuse which is removable
from the front of the control panel. Connections to
the
PC
board are made through an eight pin connec-
tor
(Pl)
mounted on the board and through the four
lead wiring harness. The
PC
board assembly mounts
on the back of the control panel.
The
PC
board assembly is designed
so
that it will not
be damaged by reversed battery polarity or by a short
FIGURE 7-1.
NHE
CONTROL
7-1
sc-1522
Redistribution or publication of this document
by any means, is strictly prohibited.
Redistribution or publication of this document
by any means, is strictly prohibited.
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