OPERATION 3.7 ELECTRICAL EQUIPMENT IN CAB BASE High Pressure Filter "HPF" and Chip Indicator Identification Codes of LED H31 The LED ”H31”, illust. Z 21753, monitors all six high pressure fil- ters and the chip indicators of the six main pumps. If a failure con- dition of a high pressure filter or chip indicator occurs, the LED ”H31” will begin flashing out a diagnostic code for identification of the concerned filter or chip indicator. If more than one filter or chip indicator send a failure signal at the same time, the LED will always show the diagnostic code of that filter/chip indicator with the lowest number.
High Pressure Filter "HPF" number, respectively main pump number of the concerned chip indicator: Example: Identification Code for High Pressure Filter #4 or chip indica- tor of main pump #4: When the differential pressure switch of high pressure filter #4 sends the signal ”Filter restricted” or when the chip indicator of main pump #4 sends the signal "chips in pump sump", the LED H31 will flash four times at regular intervals of 0.5 seconds and then after two seconds pause time will start again flashing four times at regular intervals of 0.5 seconds and so on.
The number of the four 0.5 seconds interval flashing groups cor- responds to the number of the high pressure filters respectively to the number of the main pumps. 197 Code HPF #1 1 1 1 1 1 Code HPF #2 0.5s 2s 1 2 1 2 1 2 1 Code HPF #3 0.5s 0.5s 0.5s 2s 1 2 3 1 2 3 1 1 Code HPF #4 0.5s 0.5s 0.5s 0.5s 0.5s 2s 1 2 3 4 1 2 3 4 1 Code HPF #5 0.5s 0.5s 0.5s 0.5s 0.5s 0.5s 0.5s 2s 1 2 3 4 5 1 2 3 4 1 4 Code HPF #6 0.5s 0.5s 0.5s 0.5s 0.5s 0.5s 0.5s 0.5s 0.5s 2s 1 2 3 4 5 6 1 2 3 1 2 3 4 5 6 1 2 3 0.5s 0.5s 0.5s 0.5s 0.5s 0.5s 0.5s 0.5s 0.5s 0.5s 0.5s 2s