Edwards nXDS10i nXDS15i, Инструкция по эксплуатации

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7. Fault finding
7.1 The pump has failed to start or has stopped
▪ The electrical supply fuse has blown.
▪ The ambient temperature is too high.
▪ The cooling air supply is insufficient or is too hot.
▪ The process gas is too hot or the throughput is too high.
▪ The fan is not working or is not connected.
▪ The motor is faulty.
7.2 The pump has failed to achieve the required performance
▪ Gas ballast may be selected. To close gas ballast, turn the control a quarter turn so
that the valve snaps shut. Use this setting to achieve the best possible vacuum. If
the pump has been used to pump condensable vapours or is to pump a large
chamber that has been exposed to atmospheric air (water vapour), it may be
necessary to run for at least an hour on gas ballast.
▪ If the electrical supply voltage is more than 10% below the lowest voltage specified
on the user interface panel, the pump may operate but deliver a degraded vacuum
performance.
▪ There is a leak in the system.
▪ Tip seals may need further run
‑
in, typically 24 hours, with some requiring up to a
maximum of 100 hours.
▪ The pressure measurement technique or gauge head is unsuitable or gives an
incorrect indication of pressure.
▪ The vacuum fittings are dirty or damaged. Replace the fittings.
▪ The inlet strainer is blocked. Clean or replace the strainer.
▪ The connecting pipelines are too long or too small in diameter, conductance.
▪ There is high pressure or a blockage in the exhaust line.
▪ The pump contains traces of process vapours, Run 12 hours with gas ballast.
▪ The pump is outside the specified range of operating conditions.
▪ The tip seals need replacing.
▪ The pump is in standby mode.
7.3 The pump has poor ultimate vacuum
If the pump exhibits poor ultimate vacuum, refer to Figure: Poor ultimate vacuum flow
chart on page 44 .
Page 43
A73501880_G - Fault finding