KAESER ASK 28, Operating Manual

Page: 78 / 138

3. In case of damage: Replace the drive belt immediately.
4. Replace the belt guard and tighten the screw plugs.
Replace the drive belt.
1. Loosen the screw plugs
4
and lift the belt guard
5
.
2. Loosen the nut
2
.
3. Turn adjusting nut
1
to loosen the tension on the belts until they can be removed from the pul‐
ley.
4. Install the new set of belts and use the adjusting nut
1
to adjust tension until the marker pin
reaches the lower end of the elongated hole.
5. Retighten the locking nut
2
.
6. Replace the belt guard and tighten the screw plugs.
10.10 Testing the pressure relief valve
In order to check the pressure relief valve, the machine's working pressure is raised above the acti‐
vating pressure of the valve.
Blow off protection and air system pressure monitoring are switched off during the test. In normal
operation, the blow-off protection will switch off the machine before the pressure relief valve re‐
sponds. During the inspection, the blow-off protection will switch off the machine only when the ac‐
tivating pressure of the pressure relief valve has been exceeded by 1 bar.
➤ Follow the detailed description of this procedure in theSIGMA CONTROL 2 operating
manual
➤ Never operate the machine without a correctly functioning pressure relief valve.
➤ Have a defect pressure relief valve replaced immediately.
WARNING
Excessive noise is caused when the pressure relief valve blows off!
➤ Close all access doors, replace and secure all removable panels.
➤ Wear hearing protection.
Precondition The machine is switched off.
1. Close the user's shut-off valve between the machine and the air distribution network.
2. Read off the activating pressure on the valve.
(the activating pressure is usually to be found at the end of the part identification)
3. Log on to SIGMA CONTROL 2 with access level 2.
4. Observe the display of pressure on SIGMA CONTROL 2 and call up the test function.
5. WARNING!
Risk of burns due to released cooling oil and compressed air when blowing off the pressure
relief valve!
➤ Close all access doors, replace and secure all removable panels.
➤ Wear eye protection.
6. End the test as soon as the pressure relief valve blows off or working pressure exceeds the
activating pressure of the pressure relief valve by nearly 1 bar.
7. If necessary, vent the machine and replace the defective pressure relief valve.
10 Maintenance
10.10 Testing the pressure relief valve
68
Operating Manual Screw Compressor
ASK
901824 12 E