Edwards RV12, Инструкция по эксплуатации, Страница: 47 / 64

7. Fault finding
7.1 Introduction
A list of fault conditions and their possible causes is provided in the following sections to
assist in fault-finding. If a fault cannot be rectified using this guide, call our nearest
Service Centre for help.
7.2 The pump has failed to start
▪ The electrical supply fuse has failed.
▪ The electrical supply voltage does not match that of the motor.
▪ The outlet pipeline or the outlet-filter (if fitted) is blocked.
▪ The oil temperature is below 12 °C.
▪ The oil is too viscous.
▪ The oil is contaminated.
▪ The pump has seized after long storage.
▪ The pump has been left to stand after contaminants have been pumped and has
seized.
▪ The motor is faulty.
7.3 The pump has failed to achieve the specified performance (has
failed to reach ultimate vacuum)
▪ The pressure measurement technique or gauge head is unsuitable or gives an
incorrect indication of pressure. For example, a contaminated Pirani gauge can
indicate a pressure which is several times higher than the actual pressure in the
system.
▪ The pump has been filled with the wrong type of oil.
▪ There is a leak in the vacuum system.
▪ The mode selector and gas-ballast control are set incorrectly.
▪ The oil-level is below minimum level.
▪ The oil is contaminated.
▪ The vacuum fittings are dirty or damaged.
▪ The inlet-filter is blocked.
▪ The pump has not warmed up.
7.4 The pump is noisy
▪ The motor fan-cover is damaged.
▪ The motor bearings are worn.
▪ The oil is contaminated with solid particles.
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A65201880_AA - Fault finding