SKF MicroDosage System Assembly Instructions Manual page 60

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Page 60
9.3 Questions and answers on using the SKF microdosage system
Question
3 Is it necessary to eliminate air bubbles in the supply line or
the capillary lines?
4 How can the microdosage unit monitor each of the four
lubricant outlets simultaneously using just one flow
sensor?
5 How long does it take to fill the capillary line between the
MDU and spindle at a volume of approx. 200mm³?
How long does the metering unit require for 200mm³ in
filling mode?
6 Do all lubricant outlets have to be used so that the system
functions properly?
7 After operating voltage is connected, why do the "Enable"
and "Error" LEDs light up in addition to the "Power" LED?
8 How can the function of the microvalves be checked?
9 Is it possible to supply multiple metering units with lubri-
cant using a single lubricant reservoir?
10 What can I do if I want to supply more than 4 lubrication
points?
Answer
Yes, this is mandatory. It is absolutely essential to the proper functioning of the
microdosage system that the oil fed from the lubricant reservoir (MDR) is free of
air pockets.
The system is not completely vented if air pockets are visible in the capillary lines.
All areas of the system must be carefully vented again.
The microvalves generate metering pulses in the microsecond range in quick
succession. By actuating the valves sequentially, the control unit can assign and
evaluate the recorded sensor signal to the outlet.
Filling a 1 m capillary line with an internal diameter of 0.5 mm and an internal
volume of 200mm³ takes between 30 seconds and 1 minute. The filling time
depends on the viscosity of the oil used and the ambient temperature.
No, not all lubricant outlets need to be used. Leave the rotary switches for the
unneeded outlets in position "0".
The status LED on the device lights up for 1 second after operating voltage is swit-
ched on so that the LED's function can be checked visually.
It is easiest to check the valves in manual calibration mode. If the calibration has
been started for a valve, the metering pulses can be detected acoustically assu-
ming that the ambient noises are not too strong.
See also Chapter 9.2 about error messages and the error LED.
Yes, appropriate branching of the lubricant line from the reservoir allows for
the supply of multiple micro-metering units with lubricant from one reservoir. A
requirement here is that the micro-metering units be pressurized at min. 4 bar.
Additional micro-metering units must be used to supply more than 4 lubrication
points individually with lubricant.
9. Malfunctions
Questions and answers, Table 3, Part 2 of 2