Rietschle VGA 4 Instructions De Service page 8

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 element is 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 on 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 mist eliminator element is 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 pump cylinder is worn.
Solution: send your complete unit off for repair to the supplier or approved Service Agent.
6.2 The vacuum regulating valve (if fitted) is noisy.
Solution: replace valve.
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.
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".
Storage: VGA and VGC 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 list: E 146 ➝ VGA / VGC
VGA / VGC
Noise level (max.)
Weight (max.)
Length
Width
Height
Oil capacity
Prematic AG, Märwilerstrasse 43, 9556 Affeltrangen www.prematic.ch
4
50 Hz 63
dB(A)
60 Hz 64
kg 12
3 ~ 344
mm
1 ~ 356
3 ~ 204
mm
1 ~ 204
3 ~ 180
mm
1 ~ 200
l 0,62
6 10
67 68
68 69
12,5 15
344 362
376 402
204 204
204 204
180 184
200 200
0,57 0,7
Tel. 071 918 60 60, Mail: v-g@prematic.ch
15 20
70 71
71 72
22 23
404 418
426 -
248 248
272 -
192 213
192 -
1,1 1,5
1.2001 / PM6