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TP-6200 10/12 141Section 3 Scheduled Maintenance
3.5.2 Subbase Fuel Day Tank Electronic
Control Module (ECM)
With an electronic control module (ECM), the optional
subbase diesel fuel tank functions as a day tank.
Following are operating information and features of the
ECM. See Figure 3-2 for the ECM front panel layout.
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Figure 3-2 ECM Front Panel Layout
Servicing the day tank. Hazardous voltage can cause
severe injury or death. Service the day tank electrical
control module (ECM) as prescribed in the equipment
manual. Disconnect the power to the day tank before
servicing. Press the day tank ECM OFF pushbutton to
disconnect the power. Notice that line voltage is still present
within the ECM when the POWER ON light is lit. Ensure that
the generator set and day tank are electrically grounded. Do
not operate the day tank when standing in water or on wet
ground because these conditions increase the risk of
electrocution.
ECM General Function
The ECM controls a pump/motor that maintains the day
tank fuel level. The ECM motor relay is connected to the
pump/motor. The ECM starts the pump when the fuel
level drops to 87% of full and stops the pump when the
day tank is full.
ECM Function Indicator LEDs
Two LEDs on the front panel indicate ECM operation.
See Figure 3-2 for the locations of the LEDs. Figure 3-3
describes the LED functions.
Function Description
Power On LED lights to indicate that power is applied
to the ECM.
Pump Running LED lights when the pump starts.
Figure 3-3 ECM Function Indicator LEDs
Level Sensor
An electronic analog float gauge located below the ECM
on the mounting bracket determines the day tank fuel
level. Nine LEDs on the ECM indicate the day tank fuel
levelfromfulltoempty.
ECM Mode
The ECM has three pushbutton switches for normal
operation and one internal test button. See Figure 3-4.
Pushbutton Description
Off Pushbutton disables the ECM for routine
maintenance to the tank system.
On Pushbutton activates the ECM after the
OFF pushbutton is depressed. On
power-up after a power outage, the ECM
automatically turns on.
Test Pushbutton lights front panel LEDs for
3 seconds and activates the pump/motor
for as long as the pushbutton is
depressed. The alarm relays maintain
their original positions.
Internal test Pushbutton (located inside the ECM) tests
each alarm LED and remote annunciation
relay in sequential order (high fuel to ECM
functional).
Figure 3-4 ECM Pushbuttons
ECM Alarms
The ECM has five standard alarm conditions indicated
locally by LEDs and remotely by relays. Figure 3-5
describes the five alarm conditions. Make controller
connections to the normally open and normally closed
relay contacts provided.
Alarm Description
High fuel Alarm activates at 106% of normal fuel
level.
Low fuel Alarm activates at 62% of normal fuel
level. The alarm provides time to respond
to a potential problem before a low fuel
shutdown occurs.
Critical low fuel
(engine shutdown)
Alarm activates at 6% of normal fuel level
to warn the operator to shut down the
generator set before fuel runs out.
Fuel in rupture
basin, if equipped
Alarm activates when the ECM detects
fuel in the rupture basin.
ECM functional Alarm activates to indicate a problem with
the ECM operation.
Note: The ECM functional alarm relay
activates a user-installed alarm when the
relay deenergizes.
Figure 3-5 ECM Alarms