BOC E2M28, Instruction Manual

Page: 39 / 52

E2M28 and E2M30 Rotary Vacuum Pumps
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Issue K 33 Jul 05
5.7 Clean the motor fan-cover and enclosure
If the motor fan-cover and enclosure are not kept clean, the air-flow over the motor can be restricted
and the pump may overheat.
1. Switch off the pump and disconnect it from the electrical supply.
2. Use a dry cloth and a brush to remove dirt and deposits from the fan-cover and enclosure.
5.8 Clean and overhaul the pump
Clean and overhaul the pump as described in the instructions supplied with the clean and overhaul kit
(see Section 7.3).
5.9 Fit new blades
Fit new blades to the pump as described in the instructions supplied with the blade kit (see Section 7.3).
5.10 Test the motor condition
Test the earth (ground) continuity and the insulation resistance of the pump-motor, in accordance with
local regulations for periodic testing of electrical equipment. We recommend that:
• The earth (ground) continuity is less than 0.1
Ω
.
• Insulation resistance is greater than 10 M
Ω
.
If the motor fails these tests, you must replace the motor.
5.11 Fault finding
5.11.1 Introduction
A list of fault conditions and their possible causes is provided in the following sections to assist you in
basic fault-finding. If you are unable to rectify a fault when you use this guide, call your supplier or your
nearest BOC Edwards Service Centre for advice.
5.11.2 The pump has failed to start
• The electrical supply fuse has failed.
• The motor is incorrectly wired.
• The operating voltage does not match that of the motor.
• The exhaust filter or exhaust line is blocked.
• The oil temperature is below 13
o
C.
• The oil is too viscous.
• The oil is contaminated.
• The pump is seized after long storage, or has been left to stand after pumping contaminants.
• The motor is faulty.