EN – 39
ENMaintenance
Incidents Causes Corrective actions
The vacuum pump does not produce
a vacuum (continued)
Ultimate pressure obtained: a few 7.5 x10
-3
Torr (10
-2
mbar)
Gas ballast knob open (or supplied
with dry nitrogen C1,C2 Series).
• Close the gas ballast or stop the dry air
supply.
O-ring pinched.• Replace by a new one.
One of the seals is damaged.• Replace by new ones.
One of the HP safety valves is
damaged.
• Replace the HP safety valve.
Lubrication holes blocked.• Disassemble and clean.
Incorrect anti-noise device setting.• Repeat the assembly and setting.
Part forgotten in reassembly.• Repeat the reassembly.
Filter cartridge clogged. Replace by a new cartridge.
Accessories
At the pump exhaust, the installation
produces an exhaust pressure of
1,125 Torr (1.5 bar).
• Check the installation.
Oil mist eliminator cartridge clogged.• Replace.
Noisy pump Oil level too high.• Drain and fill with a new oil.
Oil contaminated (presence of
particles).
• Drain, flush and refill with clean oil.
Pump not prepared for the oil used.• Check the pump configuration or the
type of oil.
Incorrect motor power supply.• Check the power supply.
Motor bearings damaged.• Replace the motor after inspection.
Motor coupling incorrectly set or
damaged.
• Check the setting, replace the motor
coupling.
Incorrect fan assembly.• Check the assembly.
Incorrect anti-suckback device
assembly.
• Repeat the assembly.
Vanes damaged or stuck.• Replace the vanes.
Pump too hot Ambient temperature too high.• Check that the temperature is between
12 and 45 °C.
Pump placed in a poorly ventilated
place or vents blocked.
• Check the installation.
Operation at high pressure
P > 22 Torr (30 mbar).
• Study an outside cooling drvice.
Excess pressure at exhaust.• Check the exhaust line.
Motor in over-voltage or motor in
short-circuit.
• Check the voltage, replace the motor.
All series C1 C2 C1 and C2
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