Carrier NDK33BN0KB, Operation & Service Manual

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62-61753-21 2-15
2.7 ELECTRONIC MODULES
2.7.1 Overload Ground Fault Module (OGF)
Figure 2-6. OGF Module
The OGF is located in the control box (see Figure 2-4).
The module has two electrical safety features in En-
gine and standby Operation:
1. Overload protection
2. Ground Fault (Leakage)
In each case, an "A100 - "OVERLOAD GROUND
FAULT" alarm is activated and the unit shuts down.
When of ground leakage is detected, the red LED on
the OGF module will be on continuously.
2.7.2 Phase Reversal Module (PRM)
Figure 2-7. PRM Module
The PRM is located in the control box (see Figure 2-4).
In Standby Operation, the phase reversal module
checks the electrical phase and reverses if necessary.
2.8 OPTIONS
2.8.1 Light Bar
The Light Bar is an external set of indicator lights
which can be seen in the mirror from the cab of the
tractor. The green LED indicates "STATUS OK". The
amber LED indicates "CHECK UNIT". The amber light
is illuminated when the microprocessor illuminates the
fault light. Alarms can be read on the microprocessor
display.
GREEN
AMBER
2.8.2 Door/Remote Switch(es)
The unit is provisioned to connect a Door Switch (DS)
and two additional Remote Switches directly to the
microprocessor.
The microprocessor may be configured to recognize a
switch with contacts that are either open when the
switch is activated, or that are closed when the switch
is activated. Additionally, the Configuration may be set
to determine whether the switch will: enable the alarm
only, enable the alarm and also shut the unit down,
enable the alarm and put the unit into low speed while
the switch is activated, or to have no alarm and only
record the switch activation in the Data Recorder.
If a switch is configured to shut the unit down when
activated, the unit will shut down for a minimum of
3 minutes. Additionally, there are "Override Switch"
settings in the Functional Parameters (Refer to Table
5-2 for Functional Parameter information.) If a switch
has been configured to shut the unit down, this pa-
rameter may be set to YES, to override the shutdown.
With this parameter set to "YES", the alarm will be
activated but the unit will not shutdown.
A user specified name may be configured for these
switches, this name will be displayed (recorded) rather
than the default Remote Switch #1 or Remote Switch
#2 name.
2.8.3 Out of Range Alarm/Shutdown
The microprocessor may be programmed with an Out
of Range Alarm/Shutdown feature. This option is in-
tended to notify the driver when the refrigerated com-
partment temperature is drifting away from Set Point.
The feature may be configured as an alarm only, or as
a unit shutdown alarm. Refer to Section 5.1.1 for in-
formation on setting microprocessor Configurations.
The amount of drift allowed before the configured ac-
tion is triggered is set in the Functional Parameters.
(Refer to Table 5-2 for Functional Parameter infor-
mation.) The Functional Parameter may be set at OFF,
2°C, 3°C or 4°C (OFF, 4°F, 5°F or 7°F). If the Func-
tional Parameter is set to OFF, the configured action is
deactivated.