3512B Petroleum Engines with the ADEM 2 Electronic Control Module Caterpillar

The Monitoring System monitors engine operating parameters. These parameters are stored in the memory of the Electronic Control Module (ECM). The parameters can be accessed on the Caterpillar Electronic Technician (ET). Go to the "Monitoring System" menu and activate the "Access service". The technician has the option of activating these monitoring system parameters. These parameters can be programmed in order to warn the operator of major problems that could develop in the operating system of the engine. The customer has the ability to program the trip points and the delay times for these parameters.

If the Monitoring System detects a parameter that has exceeded a trip point, an internal timer will be activated. The parameter must fall to a specific value below the value of the trip point in order to reset the timer. The difference between the specific value and the value of the trip point is called the Hysteresis. If the delay time is exceeded the Monitoring System will initiate the programmed action. The Engine Monitoring System can initiate the following events: Warning, Derate and Shutdown. Not all of these events are available for each parameter. The engine monitoring system is enabled after the engine is started. When the engine is within 50 rpm of low idle, the ECM will check the parameters. The ECM checks for oil pressure after a 10 second delay. The delay is designed to eliminate false low oil pressure warnings.

If the ECM generates an event, the event will be displayed as a "Status Flag" on the "Status" screen on the Cat ET. Go to the "Information" menu on Cat ET and activate the "Status" screen in order to see the active event. The event will be displayed across the top of the screen with the name of the ECM and serial number of the product.

The Cat ET can be used to set the programmable limits of the parameters. To set the limits, go to the "Service" menu on Cat ET. Select "Monitoring System". The screen for the Monitoring System has the following four columns: Parameter description, State, Trip point and Delay time. The following list describes the four columns:

Parameter description - The function that is being monitored

State - Programmed as ON, OFF or Always ON

Trip point - Programmed limits for safe operation

Delay time - Programmed time before action is taken.

In order to change the programmed limit, highlight the action or delay time and press the "Change" button. If a password is required to change the limit the Monitoring System will ask for either a "Factory Password" or a "Customer Password". Refer to the diagnostic procedure Troubleshooting, "Factory Passwords" for information on passwords.

Note: Use care when you program the trip point and the delay times. The ECM response must be correct for the application. If the legal range is not exceeded the engine monitoring system will accept any setting. Table 1 contains the parameters and the default limits for the Monitoring System.

Table 1

Engine Monitoring System
Parameter	ECM Response	Default Trip Point	Default Delay Time	Limits
				Range for Trip Point		Delay Time	Hysteresis
				Low	High
Low System Voltage(1)	Off
	Warning	20 VDC	10 Seconds	20 VDC	30 VDC	1 to 30 seconds	2 VDC
Low Oil Pressure	Off
	Warning	(2)	4 Seconds	N/A		1 to 15 seconds	20 kPa (2.9 psi)
	Shutdown	(2)	9 Seconds	N/A		1 to 15 seconds	20 kPa (2.9 psi)
High Coolant Temperature	Off
	Warning	102 °C (216 °F)	5 Seconds	90 °C (194 °F)	125 °C (257 °F)	1 to 60 Seconds	5 °C (9 °F)
	Derate(3)	107 °C (225 °F)	30 Seconds	90 °C (194 °F)	125 °C (257 °F)	1 to 60 Seconds	5 °C (9 °F)
	Shutdown	107 °C (225 °F)	5 Seconds	90 °C (194 °F)	125 °C (257 °F)	1 to 60 Seconds	5 °C (9 °F)
Low Coolant Temperature(1)	Off
	Warning (4)	80 °C (176 °F)	5 Seconds	63 °C (145 °F)	85 °C (185 °F)	1 to 60 Seconds	5 °C (9 °F)
Engine Overspeed	Off
	Warning	118% of Rated Speed	0 Seconds	1200 rpm	2400 rpm	0 to 5 Seconds	100 rpm
	Shutdown	118% of Rated Speed	0 Seconds	1200 rpm	2400 rpm	0 to 5 Seconds	100 rpm
Air Filter Restriction Pressure(1)	Off
	Warning	7 kPa (1 psi)	5 Seconds	3 kPa (0.4 psi)	7 kPa (1 psi)	1 to 60 Seconds	N/A
	Derate(5)	7 kPa (1 psi)	5 Seconds	1 kPa (0.14 psi)	10 kPa (1.45 psi)	1 to 60 Seconds	N/A
High Exhaust Temperature(1)	Off
	Warning	(6)	5 Seconds	500 °C (932 °F)	800 °C (1472 °F)	1 to 60 Seconds	10 °C (18 °F)
	Derate(7)	(6)	5 Seconds			1 to 60 Seconds	10 °C (18 °F)
Oil Filter Differential(1)	Off
	Warning	105 kPa (15 psi)	5 Seconds	70 kPa (10 psi)	140 kPa (20 psi)	1 to 60 Seconds	10 kPa (1.5 psi)
Fuel Filter Differential(1)	Off
	Warning	70 kPa (10 psi)	5 Seconds	50 kPa (7 psi)	140 kPa (20 psi)	1 to 60 Seconds	10 kPa (1.5 psi)
Crankcase Pressure	Off
	Warning	2 kPa (0.3 psi)	3 Seconds	0.5 kPa (0.1 psi)	6 kPa (0.9 psi)	1 to 30 Seconds	0.25 kPa (0.036 psi)
	Derate(8)	6 kPa (0.9 psi)	10 Seconds	0.5 kPa (0.1 psi)	6 kPa (0.9 psi)	1 to 60 Seconds	0.25 kPa (0.036 psi)
	Shutdown	3.5 kPa (0.5 psi)	3 Seconds	0.5 kPa (0.1 psi)	6 kPa (0.9 psi)	1 to 30 Seconds	0.25 kPa (0.036 psi)
Aftercooler Water Temperature	Off
	Warning	84 °C (183 °F)	5 Seconds	50 °C (122 °F)	125 °C (257 °F)	1 to 60 Seconds	3 °C (5 °F)
	Derate(9)	88 °C (190 °F)	5 Seconds	50 °C (122 °F)	125 °C (257 °F)	1 to 60 Seconds	3 °C (5 °F)
	Shutdown	88 °C (190 °F)	5 Seconds	50 °C (122 °F)	125 °C (257 °F)	1 to 60 Seconds	3 °C (5 °F)

(1)	Some Engine Monitoring parameters do not have the ability to perform an engine shutdown.
(2)	Refer to the oil pressure map.
(3)	If the trip point for the derate is exceeded the derate will reduce power linearly from 0 % to a maximum of 25 % over a period of 480 seconds.
(4)	The engine must be operated at an average load that is greater than 20 % for ten minutes. When the average load is greater than 20% and the coolant temperature is below 80 °C (176 °) for 5 seconds, a warning will occur. To deactivate the warning, the 10 minute average load must drop below 20% or the coolant temperature must be greater than 85 °C (185 °F).
(5)	Derates power 2% per kPa to a maximum derate of 25%. This derate will not reset, if the value falls below the value of the trip point.
(6)	Refer to the Performance and Ratings manual.
(7)	If the trip point is exceeded, engine power will be derated 2% for each 15 second time period. The maximum derate is 20%.
(8)	Derates power 15% over a 480 second time period.
(9)	If the trip point for the derate is exceeded the derate will reduce power linearly from 0 % to a maximum of 25 % over a period of 480 seconds.

Note: The derate may not have an effect when the engine is not operating at the maximum torque limit. The derate is subtracted from the maximum torque limit. The current rack limit may be below the derated rack limit. There will be no effect on engine operation until the derated rack limit falls below the current rack limit. Rack limits are added together. The maximum torque limit is 9 mm (0.354 inch).

Oil Pressure Map

Illustration 1	g00863970
Map of the engine oil pressure versus the engine rpm (X) Engine rpm (Y) Engine oil pressure in kPa (1) Hysteresis (minimum and maximum engine oil pressure) (2) Normal engine oil pressure

Example 1

Default settings are used for high coolant temperature as the coolant temperature increases to 107 °C (225 °F). A warning is issued after five seconds at 102 °C (216 °F) and a shutdown occurs after five seconds at 107 °C (225 °F).

Illustration 2	g00869677
Typical example 1

Table 2

Parameter	Enable and/or Disable	ECM Response	Trip Point	Delay Time
High Coolant Temperature	Enabled	Warning	102 °C (216 °F)	5 Seconds
	Disabled	Active Engine Derate	105 °C (220 °F)	5 Seconds
	Enabled	Shutdown	107 °C (225 °F)	5 Seconds

Example 2

Default settings are used for High Coolant Temperature as the coolant temperature fluctuates around 102 °C (216 °F). A warning is not issued when the temperature does not remain above 102 °C (216 °F) for five seconds.

Illustration 3	g00869680
Typical example 2

Table 3

Parameter	Enable and/or Disable	ECM Response	Trip Point	Delay Time
High Coolant Temperature	Enabled	Warning	102 °C (216 °F)	5 Seconds
	Disabled	Active Engine Derate	105 °C (220 °F)	5 Seconds
	Enabled	Shutdown	107 °C (225 °F)	5 Seconds

Example 3

Default settings are used for low engine oil pressure. The engine oil pressure is low when the engine is started. Once the system is enabled there is an automatic ten second delay. The delay compensates for the low engine oil pressure after the engine oil has been changed. After the delay, the timer starts due to the low engine oil pressure. A warning is issued after one second. A shutdown occurs after one second.

Illustration 4	g00869678
Typical example

Table 4

Parameter	Enable and/or Disable	ECM Response	Delay Time
Engine Oil Pressure	Enabled	Warning	1 Seconds
	Disabled	Active Engine Derate	5 Seconds
	Enabled	Shutdown	1 Seconds