Edwards nES Series, Instruction Manual, Page: 47 / 56

8. Fault finding
Table 5
Fault finding
Conditions
The pump does not run on page 43
The pump cannot reach stated vacuum on page 43
Pump is noisy on page 43
Pump runs hot on page 44
High oil consumption on page 44
Pump does not maintain vacuum after power-off and pump leaks oil on page 44
The expected process vacuum level is not reached on page 45
Fault The pump does not run
Cause No voltage
Remedy Provide power supply.
Cause Thermal switch has tripped
Remedy Identify cause and reset switch.
Cause Room temperature too low
Remedy Restore temperature to allowed value.
Cause Motor damaged
Remedy Contact service department.
Fault The pump cannot reach stated vacuum
Cause Low oil level
Remedy Top up oil.
Cause Oil contaminated
Remedy Replace oil.
Cause Pump gaskets damaged
Remedy Contact service department.
Cause Discharge clogged
Remedy Check couplings and outlet.
Fault Pump is noisy
Cause Exhaust filter element clogged
Remedy Replace.
Cause Bearings damaged
07/2020 - Page 43
A35104880_B - Fault finding