3512B Petroleum Engines Caterpillar

Air Filter Restriction

Usage:

3512B 2AF

The ECM will automatically perform the following functions if a high air filter restriction occurs:

Warning
Derating

The strategy is applied to the right side air filter and/or the left side air filter. The default settings that are programmed at the factory are listed in Table 1.

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Table 1
Inlet Air Restriction
Parameter	Default Setting
Warning setpoint	7 kPa (1 psi)
Warning delay	5 seconds
Derate setpoint	7 kPa (1 psi)
Derate delay	5 seconds
Security level	No required password
Derating per 1 kPa (.15 psi)	2%
Maximum restriction	25 kPa (3.6 psi)

If the inlet air restriction is above 7 kPa (1 psi) for five seconds, both a warning and a derating will occur. The continuous schedule of the derating is two percent per 1 kPa (0.15 psi). The maximum derating is 50 percent at 25 kPa (3.6 psi).

The derating remains at the maximum level until the situation is corrected. To reset the derating to zero percent, remove power from the ECM. The ECM will reset when power is returned.

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