Elmo Rietschle VC 200 - Manual (Page 8)

/ PM7
VC 200 300
dB(A)
50 Hz 75 81
60 Hz 79 83
kg
50 Hz 144 204
60 Hz 161 209
mm
50 Hz 775 950
60 Hz 880 950
mm 584 632
mm 425 425
l 6 8
ᕧ
9.07
4. Coupling (picture ᕧ)
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
5
). 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 fan cover (v
1
), remove the circlip (l
1
), pull off the
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 the 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 or meshes 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 on the system.
3.2 Viscosity of lubricant incorrect.
3.3 Incorrect adjustment of the adjusting bolt (X).
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 The vacuum regulating valve is noisy.
Solution: replace valve.
6.4 Blades are damaged.
6.5 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 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 pump and motor must be used. If an eye bolt is
missing use suitably rated strops. The weight of the pumps is
shown in the accompanying table.
Storage: VC units must be stored in dry ambient conditions with
normal humidity. If a pump needs to be stocked for a period longer
than 3 months we would recommend using an anticorrosion 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 232 ➝ VC 200 / VC 300
Noise level (max.)
Weight (max.)
Length
Width
Height
Oil capacity