General instructions for installation and maintenance
EVISA-Series VACUUM PUMPS
Manual N° 516917 version 6 - GB
08/2015
Page 14/16
SECTION 4.
TROUBLESHOOTING ADVICE IN CASE OF MALFUNCTIONING
Do not dismantle the pump more than necessary during repair, servicing or maintenance operations.
INCIDENT PROBABLE
CAUSE
1 - The motor cuts out.
1.1.
Mains power supply voltage or frequency incompatible with motor characteristics.
1.2.
Check the circuit breaker setting.
1.3.
Check the electrical connections.
1.4.
The oil is too viscous or the room temperature is too low.
1.5.
Rise of pressure in the exhaust unit:
- oil separating cartridge clogged,
- pump exhaust line restricted or blocked.
1.6.
Hard spot felt when pump rotated by hand: check the vanes.
2 – The pump flow rate is too
low.
2.1.
Pump inappropriate for the application.
2.2.
Suction intake screen clogged
2.3.
Suction filter (optional) clogged
2.4. Oil
separating
cartridge clogged.
2.5.
Piping too long or diameter too small, causing excessive head loss.
3 – Insufficient vacuum
created.
3.1
Leaks in the vacuum pipes or monitoring and control gear.
3.2 Insufficient
lubrication:
add oil; or filter clogged.
3.3
Pump too hot.
3.4
Air being taken in at automatic trap (impurities, etc.).
4 – Vacuum pump
overheating.
4.1
Room too small, poorly ventilated or room temperature is too high.
4.2
Insufficient distance between the wall and the pump fan.
4.3 Unsuitable
oil.
4.4
Temperature of sucked in gas is too high.
4.5
Start of clogging of the separating filter.
4.6
Exhaust line cross-sectional area too small.
4.7
Poor lubrication: add oil; or oil filter clogged.
4.8
Clean oil cooler.
4.9
Electric fan out of order.
5 – Vacuum pump emits
fumes at exhaust, or oil
consumption is high.
5.1
Separating cartridge incorrectly installed.
5.2
Separating cartridge broken or burst.
5.3
Automatic trap for re-injecting oil is blocked or its float is filled with oil.
5.4
Oil filler cap not properly tightened.
5.5 Vacuum
pump
overheating.
5.6 Unsuitable
oil.
6 – Oil backs up by suction to
vacuum chamber
6.1
Non-return valve faulty.
6.2
Motor running in reverse
7 – Abnormal noises
7.1
Pump makes clicking noise: vanes worn or deformed.
7.2
Metallic noises: fan is touching another part or the cover is touching a
lubrication pipe.
7.3
Oil viscosity too high or oil too cold.
8 – Presence of water in the oil
8.1
Pump is sucking up fluids: trap fluids upstream of pump.
8.2
Install an gas ballast system.
8.3
Pump temperature too low due either to insufficient operating time or because
room is too cold: install a preheating and rinsing system. Consult us for this.
8.4
Exhaust channelled and condensates returning into the pump: install a low
point trap.
