3512B Generator Set Engines with Dynamic Gas Blending Caterpillar

The Electronic Control Module (ECM) monitors engine operation. If a parameter extends outside an acceptable range, the ECM will initiate action. The ECM can cause a warning to occur. The ECM can derate engine power. The ECM can cause an engine shutdown to occur. Not all the actions are available for all parameters.

The Cat^® Electronic Technician (ET) can be used to select the ECM response. Cat ET can be used to program the level of engine monitoring and the delay times.

Separate timers are used in the ECM for each response that is associated with a parameter. Once the trip point is exceeded for an action, the timer for that action is started. For example, if the high coolant temperature warning is set to 102° C (216° F) with a five seconds delay, the delay timer starts counting once the coolant temperature exceeds 102° C (216° F). If the coolant remained above 102° C (216° F) for five seconds, a warning would be issued.

Use care when you program the trip point and the delay times. The resulting ECM response must be correct for the application. If the legal range is not exceeded, the engine monitoring system will accept any setting.

If the trip point for a shutdown is lower than the trip point for a warning, the engine will shutdown. The warning will not be activated.

Once a parameter has exceeded the trip point, the parameter must drop a certain amount below the trip point before the ECM response will end.

If a warning is programmed to 102 °C (216 °F), the temperature must exceed the range in order for the warning to activate. The temperature must decrease below 99 °C (210 °F) for the warning to stop. The variance is the hysteresis. The following table gives the hysteresis for each parameter.

Table 1

Parameter	Hysteresis
ECM Voltage	2 VDC
Oil Pressure	20 kPa (2.9 psi)
High Coolant Temperature	5° C (9° F)
Low Coolant Temperature	5° C (9° F)
Overspeed	100 rpm
Air Inlet Restriction	Latched
Altitude	N/A
High Exhaust Temperature	10° C (18° F)
Oil Filter Differential Pressure	10 kPa (1.5 psi)
Fuel Filter Differential Pressure	10 kPa (1.5 psi)
Crankcase Pressure	0.25 kPa (0.04 psi)
Aftercooler Water Temperature	3° C (5° F)

Note: The following tables are examples. The values may have changed. Use Cat ET to determine the actual defaults and the specific configuration.

Table 2

Programmable Monitoring System
Parameter	Default State / ECM Response	Default Trip Point	Default Delay Time	Limits
				Range for Trip Point		Delay Time
				Low	High
High Gas Pressure	Warning-Always On	40 kPa (6 psi)	2 Seconds	28 kPa (4 psi)	48 kPa (7 psi)	1 to 3 seconds
Low Gas Pressure	Warning-Always On	7 kPa (1 psi)	2 Seconds	7 kPa (1 psi)	14 kPa (2 psi)	1 to 5 seconds
Low Oil Pressure	On
	Warning-Always On	(1)	4 Seconds	N/A		1 to 15 seconds
	Shutdown	(1)	9 Seconds	N/A		1 to 15 seconds
High Coolant Temperature	On
	Warning	102° C (216° F)	5 Seconds	90° C (194° F)	102° C (216° F)	1 to 60 Seconds
	Derate	107° C (225° F)	30 Seconds	90° C (194° F)	107° C (225° F)	1 to 60 Seconds
	Shutdown	107° C (225° F)	5 Seconds	90° C (194° F)	107° C (225° F)	1 to 60 Seconds
Low Coolant Temperature	On
	Warning	80° C (176° F)	5 Seconds	63° C (145° F)	85° C (185° F)	1 to 60 Seconds
High Oil Temperature	Warning	105° C (221° F)	5 Seconds	90° C (194° F)	105° C (221° F)	1 to 60 Seconds
	Derate	110° C (230° F)	30 Seconds	90° C (194° F)	110° C (230° F)	1 to 60 Seconds
	Shutdown	110° C (230° F)	5 Seconds	90° C (194° F)	110° C (230° F)	1 to 60 Seconds
Engine Overspeed	On
	Warning	1150 rpm	0 Seconds	800 rpm	2400 rpm	0 to 5 Seconds
	Shutdown	1180 rpm	0 Seconds	800 rpm	2400 rpm	0 to 5 Seconds
Inlet Air Differential Pressure	On
	Warning	7 kPa (1 psi)	5 Seconds	3 kPa (0.4 psi)	7 kPa (1 psi)	1 to 60 Seconds
	Derate	7 kPa (1 psi)	5 Seconds	1 kPa (0.14 psi)	7 kPa (1 psi)	1 to 60 Seconds
Oil Filter Restriction Pressure	Warning	105 kPa (15 psi)	5 Seconds	70 kPa (10 psi)	152 kPa (22 psi)	1 to 60 Seconds
	Derate	170 kPa (25 psi)	5 Seconds	150 kPa (22 psi)	180 kPa (26 psi)	1 to 60 Seconds
	Shutdown	190 kPa (28 psi)	5 Seconds	150 kPa (22 psi)	190 kPa (28 psi)	1 to 60 Seconds
Fuel Filter Restriction Pressure	Warning	105 kPa (15 psi)	0 Seconds	70 kPa (10 psi)	105 kPa (15 psi)	Not Programmable
	Derate	155 kPa (22 psi)	0 Seconds	100 kPa (15 psi)	155 kPa (22 psi)	Not Programmable
	Shutdown	155 kPa (22 psi)	0 Seconds	100 kPa (15 psi)	155 kPa (22 psi)	Not Programmable
Crankcase Pressure	On
	Warning	2 kPa (0.3 psi)	3 Seconds	0.5 kPa (0.1 psi)	6 kPa (0.9 psi)	1 to 60 Seconds
	Derate	6 kPa (0.9 psi)	10 Seconds	0.5 kPa (0.1 psi)	6 kPa (0.9 psi)	1 to 60 Seconds
	Shutdown	3.5 kPa (0.5 psi)	3 Seconds	0.5 kPa (0.1 psi)	6 kPa (0.9 psi)	1 to 60 Seconds
Aftercooler Water Temperature	On
	Warning	102° C (216° F)	5 Seconds	40° C (104° F)	102° C (216° F)	1 to 60 Seconds
	Derate	107° C (225° F)	5 Seconds	40° C (104° F)	107° C (225° F)	1 to 60 Seconds
	Shutdown	107° C (225° F)	5 Seconds	40° C (104° F)	107° C (225° F)	1 to 60 Seconds
High Exhaust Temperature	Warning	680° C (1256° F)	5 Seconds	600° C (1112° F)	800° C (1472° F)	1 to 60 Seconds
	Shutdown	800° C (1472° F)	5 Seconds	600° C (1112° F)	800° C (1472° F)	1 to 60 Seconds
High Exhaust Port Temperature Deviation	Warning	200° C (392° F)	5 Seconds	100° C (212° F)	300° C (572° F)	1 to 10 Seconds
Low Exhaust Port Temperature Deviation	Warning	200° C (392° F)	5 Seconds	100° C (212° F)	300° C (572° F)	1 to 10 Seconds
Low Coolant Level	Warning	None	30 Seconds	Not Programmable	Not Programmable	4 to 65 Seconds
	Shutdown	None	30 Seconds	Not Programmable	Not Programmable	4 to 65 Seconds

(1)	Refer to the oil pressure map.

Note: The engine monitoring system is enabled after the engine is started. The ECM delays monitoring some parameters at start-up. The delay is designed to eliminate false warnings. The following parameters have a delay at start-up.

• The delay for low engine oil pressure is ten seconds.

Most active engine derates that occur are activated when the associated parameter is out of the specified range. When the parameter returns to normal operation, the active engine derate is disengaged. There is one exception for air filter restriction, the active engine derate is latched until the ECM is powered down.