Rietschle VCA 15 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 separator or 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 on the
system.
3.2 Viscosity of lubricant incorrect.
4. Vacuum pump operates at an abnormally high tempera-
ture:
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 separator or oil mist eliminator 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 (if fitted) 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 fan cover must be used.
The weight of the pumps is shown in the accompanying
table.
Storage: VCA and VCE 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 150 ➝ VCA 15 - VCA 100
E 154 ➝ VCE 15 - VCE 100
Prematic AG, Märwilerstrasse 43, 9556 Affeltrangen www.prematic.ch
VCA / VCE
Noise level (max.)
Weight (max.)
Length
Width
Height
Oil capacity
15 25
50 Hz 61 62
dB(A)
60 Hz 63 63
3~ 40
kg 37
1~ 45
mm 461 461
mm 321 329
mm 270 270
l 0,46 1
Tel. 071 918 60 60, Mail: v-g@prematic.ch
40 60 100
65 66 69
67 69 71
50 60 78
53 63 -
508 578 652
381 391 443
270 270 310
2 2 4
1.2001 / PM6