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Idiomas disponibles
Idiomas disponibles
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Initial Operation (pictures
Maximum number of starts per hour: 12 (VLT 6 - 25), 10 (VLT 40 / 60)
1. Initially switch the pump on and off for a few seconds to check the direction of rotation against the direction arrow (O).
Caution – Suction pipework should not be connected
On the initial start the suction pipework should not be connected. If the pump runs backwards with the pipework connected pressure could
build up within the housing which could result in damaged rotor blades.
2. Connect the suction pipe at (A).
Note
For pipework longer than 3 m we recommend using non-return valves (ZRK), to avoid reverse rotation when the units are switched off.
3. Vacuum regulating valve:
The vacuum can be adjusted by turning the regulating valve (C) according to the symbols on the top of the regulating valve.
Maintenance and Servicing
When maintaining these units and where the situation exits where personnel could be hurt by moving parts or by live electrical parts,
the pump must be isolated by totally disconnecting the electrical supply. It is imperative that the unit cannot be re-started during the
maintenance operation.
Do not maintain a pump that is at it's normal operating temperature as there is danger from hot parts.
1. Lubrication
The VLT pumps have bearings that are greased for life. They do not need to be serviced.
2. Air filtration (pictures
and
Caution – Pollution in the suction air
The capacity of the pump could be reduced if the air inlet filters are not maintained correctly.
The filter cartridge (e) for vacuum air has to be cleaned depending on the amount of contamination. This is achieved by blowing compressed air
from the inside of the cartridge outwards. Even if the cartridges are cleaned their separating efficiency deteriorates. We would therefore recommend
exchanging the cartridges every six months.
Changing the filter:
VLT (01) - (11) ➝ remove exhaust grid (G). Take off screw cap (s) and milled knob (m). Pull filter cartridge (e) off and clean or exchange.
Re-assemble in reverse order.
3. Blades (pictures
and
)
Checking blades: VLT 6 - 25 have 6 blades whilst the VLT 40 / 60 have 7 blades. The blades have a low but permanent wear factor.
VLT 6, VLT 10 and VLT 15:
VLT 25:
VLT 40 and VLT 60:
VLT (01) - (11) ➝ remove exhaust grid (G). Take off housing cover (b) from housing. Remove blades (d) for inspection. All blades must have a
minimum height (X):
Type
X (minimum height)
VLT 6
20 mm
VLT 10
20 mm
VLT 15
24 mm
VLT 25
24 mm
VLT 40
35 mm
VLT 60
37 mm
Note
Blades must be changed in a complete set.
Changing blades: if the minimum height is reached, then the whole set of rotor blades should be changed.
Before fitting new blades clean the housing and rotor slots with compressed air. Place the blades with the radius outwards (Y) such that the bevel
is in the direction of rotation (O
Fix end cover (b) and exhaust grid (G). Before restarting the pump check free movement of the blades by turning the motor cooling fan before refitting
the cooling grid (G
) or fan cover (G
1
b
to
)
)
first check after 7,000 operating hours (approx. 22 months in 2-shift operation), thereafter every 1,000 operating
hours (approx. 3 months in 2-shift operation).
first check after 5,000 operating hours (approx. 16 months in 2-shift operation), thereafter every 1,000 operating
hours (approx. 3 months in 2-shift operation).
first check after 3,000 operating hours (approx. 9 months in 2-shift operation), thereafter every 1,000 operating hours
(approx. 3 months in 2-shift operation).
) and corresponds with the radius of the housing (Z).
1
).
2
G
- 3 -
e
m
s
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