MVA 02 rev 5 - December 2017
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5.3
Installing and adjusting drive belts and final checks
If the fan is fitted with a
V-belt drive
, the transmission is assembled as follows:
Carefully clean tapered parts and the bush hole before fitting it onto the pulley.
Fit the bush onto the pulley, taking care to align the threaded half-holes on the pulley with the
unthreaded half-holes on the bush.
Screw in the grubscrews by hand without fully tightening them.
Fit the assembly onto the shaft, after carefully cleaning it.
Position the pulleys and check their alignment with a straight edge.
Lock in place, tightening screws alternately.
Fit the belts.
Do not force the belts with a lever, to avoid damaging the fibres of the internal reinforcement.
Before tensioning the belts, mark a known length on the taut side (e.g. 100 mm) and, rotating the
transmission, gradually tension the belts (as described in paragraph 8.4) until a relative increase in
length is obtained of:
0.8% for uniform torque;
1% for irregular torque.
Excessive belt tension may damage bearings and cause shaft breakage.
CAUTION:
On transmissions with flexible couplings, alignment must be checked before starting the fan,
as the motor pedestal could have been deformed during transport or due to tightening of the
foundation bolts.
5.4
Electrical connections
CAUTION:
The fan is supplied in conformity with Directive
2014/30/EC
on electromagnetic compatibility.
In particular, the electric motor, if supplied with the fan, is guaranteed by its manufacturer to be
conformant to this directive. It is the responsibility of the installer to check that the system in
which the fan is inserted is conformant to the directive. If the motor is not supplied with the fan
but is fitted by the customer, it is compulsory for the customer to check that it is conformant to
the directive.
The mains power supply line to the fan must be able to deliver sufficient power.
Connections to the mains power supply must be made by qualified personnel equipped with suitable PPE to
protect against electrical hazards, remembering that the customer is always responsible for the electrical
power supply through to the motor connection terminals.
Customers are reminded of the need to ensure all safety conditions for the grounding of the fan.
The grounding system must be conformant with applicable legislation in the country of installation, and must
be regularly checked by qualified personnel.
