Alarms 1-24 Feedback failure

If for any reason a feedback signal from a lubricator is measured as abnormal

by the MCU a feedback alarm will be appeared on HMI panel and AMS.

The alarm code in the HMI panel provides information about which lubricator is suspected to fail. (Alr 2 in the HMI panel indicates that lubricator 2 on cylinder 1

is failing.)

Note that in case of one lubricator per cylinder (engines with a bore below 0,60 m), the alarm will only read e.g. 1, 3, 5, 7 for cylinder 1, 2, 3, 4.

In the event of feedback failure, check as follows:

First check the feedback indicator light on the intermediate box.

If the feedback indicator light is:

- Continually on: the lubricator might be sticking.

To verify that the problem is in the lubricator, disconnect the plug for the lubricator and observe the indicator light on the intermediate box. If the light turns off after the plug is removed, the problem is located in the lubricator. The lubricator must be replaced.

Alternatively, if the light in the intermediate box remains lit after the plug to the lubricator has been removed, the fault is not in the lubricator. Check thecable and plugs from the intermediate box to the lubricator for shorts. The intermediate PCB might also be suspected.

- Continually off: start by checking if the red light in the lubricator solenoid plug

flashes.

Note that in the event of a feedback failure, the remaining working lubricator is

running double feed rate, and the defective lubricator is checked by the MCU by activating once every ten lubricator strokes to determine if the lubricator is still failing. (for engines with two lubricators per cylinder).

If no light flashes in the solenoid plug, remove the plug from the solenoid and check again if the light starts flashing. If yes, the solenoids coil may have an internal short, which can be confirmed by measuring the coil resistance.

The normal resistance is 15 to 22 ohm for ane w solenoid.

If the red light flashes in the solenoid plug, but no feedback is observed, check the connections in the lubricator plugs, mounted on the cable from the intermediate box, for loose connections or shorts.

If connections in the plug are OK, the lubricator must be replaced.

Flashes according to the light in the lubricator plug (once every ten lubricator strokes) the lubricator is working well but the feedback signals are not detected by the MCU. Replace the intermediate box PCB (Printed Circuit Board).

If the fault is still present, check the cable to the ALCU box.

Date: 2016-03-03; view: 945