G3600 ENGINES Caterpillar

Status Control Module (SCM) Programming Parameters

The Status Control Module (SCM) is designed to operate in many applications. This is achieved by allowing the operator to change key parameters on site. These parameters are programmed at the factory according to the engine and should not need to be changed. If the SCM is replaced, the appropriate set points must be programmed into the module.

NOTE: Consult a Caterpillar dealer concerning alterations to the specified set point for the engine.

SCM Memory

The programmable set point information is stored and used in the control strategy of the SCM. The set points can be changed for an application specific configuration or when a special (usually overcrank or cycle crank) setting is needed.

Set Point Descriptions

02-ETR/ETS

This set point value describes the operating mode of the fuel solenoid.

0 or 2

This set point value programs the SCM to operate with an Energized to Run (ETR) gas shutoff valve.

1 or 3

This set point value programs the SCM to operate with an Energized to Shutoff (ETS) gas shutoff valve.

2 or 3

This set point value programs the SCM to ignore pressure/temperature module faults (i.e. high oil temperature, low oil pressure) and module malfunction will NOT shut down the engine.

NOTE: This feature is not available on G3600.

03-Metric/English

A set point value of 0 will command the SCM to display engine parameters in English unit of measurement. A set point value of 1 is the factory default setting and will display metric units of measurement.

04-Ring Gear Teeth

This set point value is the same as the number of teeth on the ring gear. The range values are 95 to 350. The G3600 has 255 ring gear teeth.

05 and 06 Overspeed

The overspeed shutdown set point is programmed with the rotary selector switch in the 05 or 06 position. Position 05 has a range of 400 to 2950 rpm with increments of 10 rpm. Position 06 has a range of 2450 to 5000 rpm and should NOT be used.

Place the rotary switch in 05 position, with the specified overspeed shutdown set point to a maximum of 113% of rated speed.

NOTE: After programming the set point, 05 set point, 06 set point will be the same value.

07-Crank Termination Speed

Once the engine speed passes this set point, the starting motor is deenergized. The range is 100 to 1000 rpm in increments of 10 rpm. The factory default setting is 250 rpm.

08-011 Step Speed

Once the engine speed increases past this set point, the SCM considers the engine is above the low idle condition in regard to low oil pressure shutdown and alarm. The range is 400 to 1800 rpm in increments of 10 rpm. The factory default setting is 600 rpm.

09-Rated Speed Oil Pressure Shutdown

If the engine lube pressure drops below this set point and the engine speed has exceeded the oil step speed for nine seconds, and then the SCM enters a low oil pressure shutdown condition. The range is 34 to 420 kPa (5 to 60 psi). An alarm signal is sent to the remote annunciator module at 34 kPa (5 psi) above the shutdown. The factory default setting is 350 kPa (51 psi).

10-Idle Speed Oil Pressure Shutdown

If the engine lube pressure drops below this set point and the engine has run for more than nine seconds and the engine speed is below the oil step speed, the SCM will enter a low oil pressure shutdown condition. The range is 20 to 336 kPa (3 to 50 psi). An alarm signal is sent to the annunciator module at 34 kPa (5 psi) above the shutdown. The factory default setting is 105 kPa (15 psi).

11-High Oil Temperature Shutdown

If the engine oil temperature has exceeded the set point for 10 seconds, then the SCM will enter a high oil temperature shutdown condition. The factory default setting is 90°C (194°F).

12-Low Oil Temperature Alarm

If the engine oil temperature is less than the set point for two seconds, then the SCM sends an alarm signal to the annunciator module. The range is 10 to 300C (50 to 860F). This parameter is not used for this application.

13-Overcrank Time

Total time to start the engine (from when first asked to start until overcrank is indicated). The range is 10 to 360 seconds. Factory setting is 45 seconds.

14-Cycle Crank

The amount of TMC the starting motor cranks. Also, the amount of time the starting motor rests between crank cycles. The range is 5 to 300 seconds. Factory setting is 30 seconds.

15-Cooldown

The amount of time the engine is allowed to run after initiation of a normal shutdown. The range is 0 to 30 minutes. Factory setting is 0 minutes and it is recommended to be left at 0 minutes.

Caterpillar Ignition System (CIS)

The spark reference number is a number, which correlates with voltage demand at the spark plug and is calculated for every firing of each cylinder. As the voltage increases, the reference number also increases. The number is non-linear and will increase faster at higher voltages (above 20 kV). The usefulness of the number is not in its absolute value, but rather in how the number changes over time as the spark plugs erode. With a little experience, the engine operator will be able to tell when spark plugs require changing. Abnormal conditions in the ignition system, such as open or short circuits in the primary and secondary wiring, can also be detected.

This reference "cylinder spark data" number can be viewed separately for each ignition output (cylinder) in two ways.

-An instantaneous value: 1st number in ( )

-An average value: 2nd number in ( ) AVG

From the home screen on the CIS:

Press the F1 key.

The evaluation number is displayed for output "A".

Then from the view data screen use the following keys to view the next CYL or to exit.

Press NEXT to view next cylinder.

Press ESC to exit.

Spark Reference Number

The spark reference number is used in conjunction with comparative thresholds to set diagnostic codes for several different ignition systems and spark plug conditions. A "twice in a row" requirement is used to avoid flagging a diagnostic based on the data of only one firing event. The reference number is compared to the thresholds described below.

The average value is used to compare against programmed thresholds. When a threshold is violated twice in a row, the corresponding diagnostic flag is set for the appropriate cylinder. The diagnostic flags are latching and will exist until the unit is restarted or until a reset or power down occurs.

User Programmable Thresholds

The above user programmable thresholds need to be adjusted based on the type of coil being used and on the operating characteristics (specifically, voltage demand) of the engine. There are known differences between various types of Altronic coils, and slight variations are normal between coils in the same type and vintage (production date). This will aid greatly in detecting variations in one cylinder vs. the general trend in the engine. The typical ranges to be expected in normal operation with new spark plugs are listed in the table below.

The indicated thresholds were designed to be adjustable so that the user can customize these diagnostics to fit the specific needs of each engine. It will take some testing and adjustment to obtain thresholds that optimize the use of these features. For maximum benefit, the spark reference number for each cylinder should be recorded at normal operating load with new spark plugs installed and then monitored over a period of time for changes. The HI SPARK VOLTAGE alarm level should be set (typically) at 180 initially and can be adjusted as experience dictates. A gradual increase in the spark reference number is expected over time as the spark plug electronics erode.

In addition to the diagnostic flags, the reference numbers can also be used for predictive purposes:

A. As the numbers increase toward the present HI SPARK VOLTAGE threshold, the operator knows that a change of spark plugs should be scheduled. With this information, this function can be determined on an actual need basis rather than a predetermined schedule. Also, unexpected engine misfiring or shutdowns can be avoided by tracking the reference numbers on a routine basis.

B. The reference numbers can provide an early warning of a difference operation in a given cylinder(s). A reading higher (or lower) than the other cylinders, when such a difference is not normally present, tells the operator of a potential problem. This allows further troubleshooting and evaluation to take place before an unexpected operational problem develops. The low voltage threshold can be viewed and adjusted from the CIS module.

From the home screen:

Programming Parameters

Press the F2 key.

The threshold for spark voltage is displayed.

NOTE: 1. Adjust to 0 to disable this diagnostic.

NOTE: 2. Factory setting is 60.

Press to increase threshold.

Press to decrease threshold.

Press NEXT to view voltage threshold.

Press ESC to exit.

Select the other threshold screens by pressing the NEXT or F2 keys. The threshold for the HI SPARK VOLTAGE is displayed.

Press NEXT to view the No Secondary Spark threshold.

NOTE: 1. Adjust to 255 to disable this diagnostic.

NOTE: 2. Factory setting is 200

The threshold for the No Secondary Spark is:

Press NEXT to view the low voltage threshold.

NOTE: 1. Adjust to 255 to make this diagnostic less sensitive.

NOTE: 2. Factory setting is 250

A. The spark energy setting has only a small effect on the reference number if the spark plug fires correctly. Therefore, the high and low voltage thresholds should hold across the energy settings if the spark plugs continue to fire correctly. On the other hand, a worn plug may not fire consistently on energy setting E1 but will on energy setting E2. In this case there will be a significant difference in the reference number when the energy setting is changed. Operators may be able to increase spark plug life by operating initially with new spark plugs on E1 energy setting and use the HI SPARK VOLTAGE alarms as an indicator to increase the energy progressively to E3.

B. The spark reference number is designed to work with one coil per output.

Personality Module Programmable Features

Fuel Parameters

Protection Settings

Air Temperature Settings

Air Restriction Settings

Crankcase Pressure Settings

Battery Voltage Settings

Differential Oil Pressure settings

Jacket Water Settings

NOTE: Bio Gas and Co Gen may be different.

Diagnostic Settings

Core Parameters

Replacing the Personality Module

NOTE: Read the instructions completely before installing a new Personality Module.

NOTE: The Diagnostic Display Tool (DDT) must have software version 1.6 installed to acquire the information needed to complete the table below. To check the software version. Power up the DDT and advance to screen 00 (zero, zero).

Step 1: With the engine stopped and the Mode Control Switch (MCS) in the STOP position, recorded the following:

Step 2: Rotate the Mode Control Switch to the OFF/RESETposition. After the panel has completely powered down install the new Personality Module.

Step 3: Rotate the Mode Control Switch to the STOPposition. The Mode Control Switch MUSTremain in the STOPposition for five minutes. The prelube switch (screen 65 on the DDT) must be de-energized for this five-minute interval.

Step 4: Select Inlet Manifold pressure on CMS gauge #4. If the value is within 2 kPa or .29 psi of the original value recorded above, proceed to the next step after the five-minute interval has elapsed.If the value is different by more than 2 kPa, recalibrate the Air Pressure Module. Refer to the Systems Operation Testing and Adjusting manual for your engine.

Step 5: Start the engine but DO NOT add load to the engine. Allow the engine to stabilize for one minute.

Step 6: Record ALLdisplayed Diagnostic Codes.

Step 7: Clear all Diagnostic Codes. DO NOT increase the load on the engine. Rotate the Mode Control Switch to the STOPposition.

Step 8: Allow the engine to come to a complete STOPand postlube to complete.

1. Start the engine.

2. Increase the speed to rated.

3. Adjust Choke Trim (DDT Screen 33) to provide the most stable operation.

4. Apply load to engine.

5. Adjust governor (DDT Screen 70 through 72) and Wastegate (DDT Screen 80 through 82) for stable operation.

6. Start at original values as recorded.

The engine is now ready for normal service.