Sullair 750HH - Engine Control Module Functional Description; Electrical System Functional Description

SECTION 2 600H, 750, 750H, 750HH, 825, 900 & 900H USER MANUAL
35
2.12 ENGINE CONTROL MODULE,
FUNCTIONAL DESCRIPTION
Diagnostic Fault Codes are provided to indicate an
electrical or electronic problem has been detected by
the ECM (Engine Control Module). In some cases,
the engine performance can be affected when the
condition causing the code exists. More frequently,
however, the operator cannot detect any difference
in the engine performance.
The Controller indicates a performance problem has
occurred.
If the Controller does not indicate a problem with the
engine performance but a diagnostic code is logged
by the ECM, the ECM detected an abnormal
condition that did not affect performance.
If this is the case, unless there are several
occurrences of the code in a very short period of
time, or, the ECM is indicating an Active Code at the
present time, there is most likely nothing wrong with
the system.
2.13 ELECTRICAL SYSTEM,
FUNCTIONAL DESCRIPTION
Refer to Controller wiring diagram on page 36. The
electrical system is comprised of not only the
necessary equipment required to operate the
compressor, but also a system to shut it down in the
event of a malfunction. The components of the
electrical system are an engine starter (with an
integral solenoid), battery, a breaker protected
alternator with a built-in voltage regulator, a breaker
protected engine air inlet heater (for cold weather
starting), a compressor discharge temperature
sensor and receiver tank temperature switch will shut
down the compressor should the compressor
temperature exceed 250°F [121°C], and a fuel level
sensor.
The electrical system also incorporates a lockable
battery disconnect to be utilized for extended periods
of non use and during machine maintenance. In case
of emergency, an emergency stop switch is located
just above the Controller on the canopy of the
machine. The Compressor wiring diagram on page
38 shows the wiring diagram for the Compressor.
NOTE
Only Active diagnostic codes can be read
in this manner. Logged diagnostic codes
must be retrieved with an Electronic Ser-
vice Tool.
WARNING
Ether starting aids should NOT be used with
this engine. The engine is equipped with an
air inlet heater for cold-starting conditions.