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2. Air filtration (picture
The capacity of the pump can become reduced if the air inlet filters are not
maintained correctly.
Mesh Filter (f
) must be cleaned regularly depending upon the amount of contamination.
1
Cleaning can be carried out by washing out or by blowing out with compressed air.
Replace filters if contaminated completely.
The mesh filter (f
) can be dismantled by removing screws (s
1
cover (D). Re-assemble in reverse order.
3. Oil separation (picture
Extremely blocked filter elements will result in an increased pump tempera-
ture and will cause discolouration of the lubricant.
The oil separator elements may become contaminated after a long period of operation
which can result in high pump temperature and motor overload. We therefore recom-
mend that the filter elements (L) are changed every 2000 operating hours. It is not
possible to clean these elements.
To change filters: The exhaust cover (Y) can be removed after removing the screws (s
Remove grill (Y
) out of the exhaust box. The angle frame (Y
1
removing the screws (s
Re-assemble in reverse order.
4. Coupling (picture
The coupling rubbers (k) are wearing parts and should be checked regularly. When the coupling rubbers are worn this can be detected by a knocking
sound when the vacuum pump is started.
Defective coupling rubbers can cause extensive damage and even in some extreme cases break the rotor shaft.
To check the coupling, stop the motor (m) and isolate. Remove the screws (s
side coupling half (q). If the coupling rubbers (k) are damaged remove the circlips (l) from the coupling bolt (r) and exchange the coupling rubbers (k).
Leave the spacer (p) in place, check the coupling bolts (r) for any wear and replace if necessary. To replace, remove the circlip (l
coupling and fan (v) complete, from the pumpshaft, remove the nut (w) with washer (u) and exchange the coupling bolts.
Re-assemble in reverse order.
Trouble Shooting
1.
Motor starter cuts out vacuum pump:
1.1 Check that incoming voltage and frequency corresponds with the motor data plate.
1.2 Check the connections on the motor terminal block.
1.3 Incorrect setting on the motor starter.
1.4 Motor starter trips too fast.
Solution: Use a motor starter with a time delay trip (version as per
IEC 947-4).
1.5 The vacuum pump or the lubricating oil is too cold.
1.6 The viscosity of lubricant is too high.
1.7 Oil mist eliminator elements are blocked or contaminated.
1.8 Back pressure on the exhaust pipework is excessive.
2.
Insufficient suction capacity:
2.1 Inlet filter is obscured.
2.2 Suction pipe work is too long or too small.
3.
Vacuum pump does not reach ultimate vacuum:
3.1 Check for leaks on the suction side of the pump or at the system.
3.2 Viscosity of lubricant incorrect.
4.
Vacuum pump operates at an abnormally high temperature:
4.1 Ambient or suction temperature too high.
4.2 Cooling air flow is restricted.
4.3 Problem as per 1.6, 1.7 and 1.8.
5.
Exhausted air contains visible oil mist:
5.1 Oil separator elements are fitted incorrectly.
5.2 Incorrect oil brand is used.
5.3 Problem as per 1.7, 1.8, 4.1 and 4.2.
6.
Unit emits abnormal noise:
Note: A knocking noise from the rotor blades is normal when starting
from cold, as long as it disappears within two minutes with increasing
operating temperature.
6.1 The coupling rubbers are worn (see under "servicing").
6.2 The pump cylinder is worn.
Solution: send your complete unit off for repair to the supplier or
approved service agent.
6.3 Blades are damaged.
6.4 Problem as per 1.5 and 1.6.
7.
Water in lubricant i.e. Emulsification:
7.1 Pump pulls in water because of the application.
Solution: Fit water separators on to the vacuum side.
7.2 Unit handles more water vapour than the gas ballast is designed for.
Solution: Consult supplier for the provision of an increased gas ballast
capability.
7.3 Pump operates only for a short time and does not reach normal
operating temperature.
Solution: Run the pump with closed suction until the oil has been
cleaned.
Prematic AG, Märwilerstrasse 43, 9556 Affeltrangen www.prematic.ch
)
)
). Remove plastic fixings (t) and exchange the elements (L). If possible re-use the o-ring (L
3
)
) on the connection
1
).
2
) can be removed after
2
) on the motor flange (n). Pull off the motor together with the motor
5
Y
Y
s
2
s
5
Tel. 071 918 60 60, Mail: v-g@prematic.ch
s
f
1
1
D
) for re-assembly.
1
Y
2
1
s
3
L
t
m
q
l
k
p
r
n
u
), pull off the
1
L
1
l
v
1
w
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