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5. 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 the incoming voltage and frequency corresponds with the motor
data plate.
1.2 Check the connections on the motor terminal block.
1.3 Pump is trying to operate against a closed exhaust or without an unloading
valve on start/delta starting.
Solution: Optional extra, unloading valve model ZAE.
1.4 Incorrect setting on the motor starter.
1.5 Motor starter trips too fast.
Solution: Use a motor starter with a time delay trip (version as per IEC 947-4).
1.6 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.
2.3 Leak on the pump or on the system.
2.4 Blades are damaged.
3.
Vacuum pump does not reach ultimate vacuum:
3.1 Check for leaks on the suction side of the pump or on the system.
3.2 Blades are worn or damaged.
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.
5.
Unit emits abnormal noise:
5.1 The pump cylinder is worn.
Solution: send your complete unit off for repair to the supplier or approved service agent.
5.2 The regulating valve (if fitted) is noisy.
Solution: replace valve.
5.3 Blades are damaged.
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 nearest
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 Operation".
Lifting and Transport: To lift and transport the vacuum pump the eye bolts on the housing 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: VFT units must be stored in dry ambient conditions with normal humidity. We recommend for a relative humidity of over 80% that the
pump should be stored in a closed container with the appropriate drying agents.
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 157
E 158
VFT
Noise level (max.) /
Sound power*
Weight (max.)
Length (max.)
Width
Height (max.)
), pull off the coupling and fan (v) complete from the pumpshaft, remove the nut (w) with
1
VFT 25 - VFT 100 (01)
VFT 25 - VFT 100 (07)
25
40
50 Hz
72
74
dB(A)
60 Hz
74
76
(01)
42
55
kg
(07)
45
57
(01)
585
680
mm
(07)
585
680
mm
333
333
(01)
254
254
mm
(07)
305
305
) on the motor flange (n). For motors secured by the feet, screws (s
5
E 167
VFT 140 - VFT 500 (01)
E 168
VFT 140 - VFT 500 (07)
60
80
100
140
76
77
80
82
78
79
82
84
70
95
103
151
73
97
105
161
710
753
803
828
709
754
804
847
383
431
437
566
292
319
319
450
343
363
363
647
180
250
340
84
86 / 95* 88 / 97* 90 /100*
86 / 95* 88 / 97* 90 / 99* 91 /101*
200
222
390
215
245
410
993
1074
1244
993
1073
1244
566
566
702
450
450
575
647
647
807
)
6
500
520
550
1445
1445
712
575
807
1.2001
/ PM6
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