Kohler 20-3250 kW manual Subbase Fuel Day Tank Electronic Control Module ECM

3.5.2Subbase 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 level from full to empty.

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	Alarm activates at 6% of normal fuel level
(engine shutdown)	to warn the operator to shut down the
	generator set before fuel runs out.
Fuel in rupture	Alarm activates when the ECM detects
basin, if equipped	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

TP-6200 10/12 Section 3 Scheduled Maintenance 141