SYSTEM / Control System Auto Lubrication Control (Optional) Purpose:Controls the auto lubrication system correctly. (Refer to the Others (Upperstructure) group, distribution valve group / COMPONENT OPERATION.) Operation: 1. When the auto lubrication switch is turned ON, terminal B24 is connected to the ground inside MC. 2. Therefore, auto lubrication relay (R11) is excited. 3. Electrical current from fuse #30 flows to terminal #3 in the grease pump and proximity switch. 4. Therefore, the grease pump is activated and auto lubrication starts. 5. While auto lubrication relay (R11) is turned ON, the grease pump is activated and delivers grease. 6.
When the grease pump delivers grease, the pis- ton in distribution valve is operated. 7. The proximity switch is provided in distribution valve and is turned ON or OFF by the piston stroke of distribution valve. 8. When the piston of distribution valve comes up to the proximity switch, the proximity switch is turned ON and the transistor in proximity switch is turned ON. Therefore, terminal #B5 in MC is connected to the ground via the proximity switch. 9. In opposite, when the piston of distribution valve becomes away from the proximity switch, the proximity switch is turned OFF and the transistor in proximity switch is turned OFF.
Therefore, electrical current from terminal #3 flows to termi- nal #B5 in MC. 10. MC detects operating number (stroke number) of distribution valve according to the signal input to terminal #B5. 11. When operating number (stroke number) reaches the setting, MC blocks the grounding connection of terminal #B24. 12. Consequently, auto lubrication relay (R11) is turned OFF and no electrical current flows to the grease pump, so that the grease pump stops. 13. After the preset interval, MC activates the grease pump and starts auto lubrication in order to con- nect terminal #B24 to the ground. 14.
Within five minutes after auto lubrication relay (R11) is turned ON, if the signal from the proximity switch is not sent to terminal #5 in MC, MC rec- ognizes that the auto lubrication circuit is faulty (no grease, faulty grease pump). Then, the auto lubrication alarm is displayed on the monitor unit. NOTE: Lubrication time and interval can be set by using the monitor unit and the service mode in Dr.ZX. Auto Lubrication Switch (Optional) M1J1-03-001 T2-2-60