8
4.7 Electrical connection
Use only authorized specialists to set up the electrical system, working in compliance with regu-
lations applying to the place of installation and in accordance with the requirements of the local
body supplying electrical energy. Check on the motor plate:
•
Voltage
•
Frequency
•
Number of phases
•
Absorbed current
Connect the cables as shown in the diagram accompanying the terminal box of the motor. If the
diagram has not been supplied, request it from the motor manufacturer. Use electrical cables of suitable
size, depending on the nominal current of the electrical motor. Keep the electric cables away from
heat sources and/or pointed edges. The motor must be protected by means of an automatic switch
set at the value of the rated current shown on the plate. For the safety of personnel, the system must
be protected by a suitable grounding device.
WARNING:
Blower service must be carried out only after disconnecting the electric sup ply.
4.8 Preliminary controls
If the blower has been in storage for more than 6 months, check its state of preservation.
•
Check the coupling or the sheave alignment
•
Check the belt tension.
•
Check that the blower shaft rotates freely manually.
•
Check that the safety protection devices have been correctly installed and secured.
•
Fill the blower with oil as described in paragraph 6.1.1.
4.9 Start up
4.9.1 First start-up
Open the shut-off valve.
•
Check that the safety valve has been set at the operating value.
•
Check the rotation by ‘jogging’ the motor.
WARNING:
During this operation, personnel are in direct contact with the blower, and
for this reason noise protection must be worn.
Start the blower
•
Increase the operating pressure gradually until the rated value is reached.
•
After about 10 to 20 minutes check that there are no oil leakages and strange noises or
vibrations. If such problems are found, stop the blower immediately.
WARNING:
Do not rotate the blower in the wrong direction for more than a few revolutions.
4.9.2 Normal start-ups –
With direct start-up the motor starts even with the maximum discharge
counter-pressure. With star-delta start-up, on the other hand, or with the starter; the counter-pressure
must be zero.
Blower Engineering Instructional Manual
Summary of Contents for Tri-Lobe TL Series
Page 1: ......
