35
7 TROUBLESHOOTING
Operating problems List of causes
The motor does not start up and there is no noise 1-3-4
The motor does not start up, but humming noise is heard 2-3-4-5-6-7
Automatic cut off just after start up 3-4-5-6-7
Inlet pressure different from the rated value 13-16
Outlet pressure different from the rated value
WARNING : STOP THE BLOWER IMMEDIATELY
14-16
Outlet temperature different from the rated value
WARNING : STOP THE BLOWER IMMEDIATELY
8-13-14-16-17
High absorbed power 3-5-6-7-9-13-14-16-19
Oil and/or liquid leakage 10-11-12-15-19
High oil temperature 13-14-16-17-18-19-21
Unusual noises and/or vibrations
WARNIING : STOP THE BLOWER IMMEDIATELY
5-6-7-8-9-13-14-17-22
Pos
Cause Solution Rif.
1
At least 2 of electric connections have been
cut off
Check the fuses, terminal boards and
connection cables and if required replace them.
4.9
2 1 electric connection has been cut off. See point 1. 4.9
3 Incorrect electric connection
Check electric system
4.9
4 Faulty motor Check the electric motor 4.9
5 Rotors making contact
Stop the blower immediately and check the
internal clearances of the rotors and of the gear
6.2.3
6.2.4
6 Scale deposits in the compression chamber
Clean the compression chamber and the rotors,
balance the rotors if necessary
6.2.2
7 Intake of foreign particles
Remove the foreign particles, clean the
compression chamber and check the
clearances
6.2.3
6.2.3
6.2.4
8 Rotors are worn Check the internal clearances 6.2.4
9 Bearing are worn Replace the bearings
(1)
10 Gaskets are worn Replace the gaskets
(1)
11 Drive shaft seal is worn Replace the seal 6.2.1
12 Oil level plugs are broken Replace the oil levels
(1)
13 Inlet piping is clogged Check piping and remove obstruction 4.5.1
14 Outlet piping is clogged Check piping and remove obstruction 4.5.2
15 Cooling circuit damaged (only /RV) Restore the circuit 4.5.3
16
Speed of rotation different from rated value
Reset the rated value
(2)
17
Inlet temperature different from rated value
Reset the rated value
(2)
18
Cooling liquid capacity different from rated
value (only /RV)
Reset the rated value
4.5.3
19 Oil level too high Reset correct oil level 6.1
20 Oil too viscous Use less viscous oil 6.1.1
21 Oil produces foam Change the type of oil 6.1.1
22 Transmission not aligned Check the alignment 4.4
(1) To do this operation see service manual
(2) Check the plant
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