Carrier TRANSICOLD 69UG15 Series, Операция и обслуживание, Страница: 14 / 60

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T-343
1.7 OPERATING CONTROLS & INSTRUMENTS
1.7.1 Introduction
Components required for monitoring and controlling the
unit are located in the control box, on the control panel
(see Figure 1-1, item 6) and on the receptacle box (see
Figure 1-1, item13).
1.7.2 Control Panel and Related Components
a. Gauges and Senders
1. Oil Pressure Gauge (see Figure 1-7, Figure 1-8,
Figure 1-9)
The purpose of this gauge is to observe normal
operating engine oil pressure. Normal oil pressure is 35
to 60 psig (3.3 to 5.2 kg/cm
2
).
2. Oil Pressure Sender (see Figure 1-5)
This device senses engine lube oil pressure and
transmits a signal to the oil pressure gauge. The oil
pressure sender is located on the oil filter housing.
3. Water Temperature Gauge (see Figure
1-7,
Figure 1-8, Figure 1-9)
The function of this gauge is to observe water operating
temperature. The gauge is connected to the water
temperature sender.
4. Water Temperature Sender (see Figure 1-2)
This device senses engine water temperature and
transmits a signal to the water temperature gauge.
5. Low Coolant Sensor (see Figure 1-2)
This device senses the coolant level inside the radiator
and will complete a conductive circuit as long as the
probes remain immersed in coolant. When the coolant
level falls below the probes, a signal will be sent to the
auto restart module, shutting down the engine and all
12 − volt circuitry.
6. Auto Restart Module
Auto start/restart is provided to simplify the start
− up
process and provide an automatic restart feature that
will automatically attempt to restart the unit in the event
of shutdown. Four LEDs are used to indicate shutdown
from overcrank, overspeed, low oil pressure, and high
water temperature. A fifth LED is used to indicate the
unit is running (see Figure 1-9). Refer to Table 1-2 for
system preset values.
The auto restart function will perform a series of six
attempts to restart the unit and make three attempts
within each series. Once the function has completed all
18 attempts, the unit will automatically lock out future
crank attempts. Refer to Table 1-3 for detailed
information on auto restart sequencing.
b. Meters
1. Ammeter (A)
The ammeter (see Figure 1-7, Figure 1-8, Figure 1-9) is
an indicator of the charging system and unit electrical
draw. It indicates the rate of discharge or charge of the
battery. During start up, the intake heater draws
approximately 42 amps.
2. Total Time Meter (TT)
The total time meter (see Figure 1-7, Figure 1-8,
Figure 1-9) calculates the total hours and provides an
accurate readout of accumulated engine running time.
This data can be used to establish the proper periodic
maintenance schedule (refer to Section 4.1).
c. Manual Switches
1. Intake Heater Switch (HS) (see Figure 1-7,
Figure 1-8)
The intake heater switch is of the momentary type.
When held in the PREHEAT position, the switch allows
approximately 42 amps of battery current to flow into the
intake heater, which preheats the air within the intake
manifold and allows the engine to start. After starting the
engine, the intake heater switch should continue to be
held in the ON position for approximately 5 seconds until
the engine has developed enough oil pressure to close
the oil pressure safety switch.
2. Ignition Switch (IGN) (see Figure 1-7, Figure 1-8,
Figure 1-9)
The ignition switch is of the momentary type to be used
in the OFF/ON/START positions. When held in the
START (ignition) position, it energizes the starter motor
solenoid, which in turn allows the starter motor to crank
the engine. The switch is released to the RUN position
once the engine has started.
3. Ignition Switch (IGN)(Auto Restart) (see Figure 1-9)
The ignition switch is of the maintained contact type to
be used in the RUN/OFF positions. When switched to
the RUN position, it energizes the control module, which
in turn controls all functions of the genset.
4. Operating Mode Switch (see Figure 1-7, Figure 1-8)
The Operating Mode (Dual Speed) switch is of the
maintained contact type to be used in the
ECONOMY/POWER positions. When switched to the
ECONOMY position, it energizes the dual speed timer
control module, which signals the programmed
electronic governor module (EG) to reduce engine
speed from 1800 RPM to 1500 RPM after a period of two
(2) hours.
d. Timers
1. Intake Heater Timer (IHT)
The Intake Heater Timer continues to supply power to
the intake heater for 3 minutes after initial start − up.
2. Dual Speed Timer (DT)
The Dual Speed Timer provides power to the electronic
governor module for a 2 hour period to maintain initial
high speed operation.