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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
should also be removed. Pull off the motor together with the motor 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
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 filters are 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 cold starting 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.
Appendix:
Repair on Site: For all repairs on site an electrician must
disconnect the motor so that an accidental start of the unit
cannot happen.
All engineers are recommended to consult the original
manufacturer or one of the subsidiaries, agents or service
agents. The address of the closest repair workshop can be
obtained from the manufacturer on application.
After a repair or before re-installation follow the instructions
as shown under the headings Installation and Initial Opera-
tion.
Lifting and Transport: To lift and transport the vacuum
pump the eye bolts on the pump and motor must be used.
If an eye bolt is missing use suitably rated strops.
The weight of the pumps are shown in the accompanying
table.
Storage: VCH units must be stored in dry ambient condi-
tions with normal humidity. If a pump needs to be stocked
for a period longer than 3 months we would recommend
using an anti-corrosion oil rather than the normal lubricant.
Disposal: The wearing parts (as listed in the spare parts
lists) should be disposed of with due regard to health and
safety regulations.
Spare parts lists: E 208
E 209
), pull off the coupling and fan (v) complete from the pumpshaft, remove the nut (w) with
1
VCH 100 / 140
VCH 180/ 250/ 300
) on the motor flange (n). For motors secured by the feet, screws (s
5
m
s
6
VCH
3
m
/h
Capacity
mbar
Ultimate vacuum
3 ~
Motor version
kW
Motor rating
Current drawn
A
-1
min
Speed
Average noise level
dB(A)
Noise level (max.)
dB(A)
kg
Weight
l
Oil capacity
s
5
n
q
l
k
p
100
140
180
50 Hz
100
140
180
60 Hz
120
168
216
0,5
50 Hz
230/ 400V ± 10%
60 Hz
220/ 380V
50 Hz
2,2
3,0
4,0
60 Hz
2,6
3,6
4,8
50 Hz
10,0 / 5,9 12,0 /6,8 15,5 / 8,8 11,5 / 6,6 11,5 / 6,6
60 Hz
13,6 / 7,9 18,5 /10,7 21,0 /12,0 16,0 / 9,2 16,0 / 9,2
50 Hz
1450
60 Hz
1740
50 Hz
72
73
74
60 Hz
#
#
#
50 Hz
74
75
76
60 Hz
#
#
#
113
118
175
2,2
2,2
4,0
)
6
v
l
1
r
u
w
250
300
250
280
280
336
230/ 400V ± 10%
380/ 660V
5,5
5,5
6,5
6,5
75
75
#
#
77
77
#
#
212
225
4,8
4,8
/ PM6
1.2001
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