CIAT Climaciat Instruction Manual page 27

9.4.3 System start-up
ƒ EC motor
- To activate limitation of the starting current, wait at least 90 seconds between shutdown and restarting.
ƒ AC motor
- Check the motor's direction of rotation: to do this, send a pulse via the starting control.
- If necessary, swap two phases downstream of the starter to change the direction of rotation (e.g. L1 with L2).
ƒ Frequency inverters
- Follow the predefined wiring (see inverter manual).
- When using a frequency inverter, before commissioning, it is essential to limit the upper frequency to avoid exceeding the
maximum speed for the rotating parts and prevent motor overload.
- Also check the fan operation, one frequency at a time. Mark anywhere there may be resonance zones in order to eliminate
them by frequency hopping (see inverter manual).
ƒ Fan motor assembly
- Check for the presence of air flow.
- Measure the input current on each phase. The currents measured must not exceed the value shown on the data plate.
9.4.4 Fans with belt and pulley transmission:
Always follow the practical rules and instructions concerning shaft parallelism and alignment of the transmission.
Firstly, carefully check the pulley alignment before making any thorough adjustments to the tension of the belt(s).
A - Pulley alignment:
α max. < 0.5°.
β max. < 4 mm per metre of centre distance.
During commissioning and after any work on the transmission, check its alignment using a laser alignment tool or a straightedge
placed on the machined surface of the two pulleys, or using a string.
B - Belt tension:
Note: The belt tension must be checked in all cases and before system start-up.
For ATEX applications, refer to standard EN 149866.
Excessive tension on the belt(s) results in unnecessary force on the bearings, which can lead to premature wear on the assembly.
Insufficient belt tension can cause slippage, overheating and premature wear of the belt.
The belts have only been pretensioned for storage and shipping purposes. It is essential to tension them using the procedure
described below:
Deflection test:
The belt tension must be checked and corrected using a suitable measuring instrument (tensiometer or dynamometer).
Ea calculation:
- Ea = (e x E)/100 = Deformation in mm for a pulley centre distance of 100 mm
- e = Pulley centre distance in mm
- E = See table below for the value
- f = Force applied
At the centre of the centre distance "e", apply a force "f", as determined in the table below, to each belt. Set the belt tension to
obtain the calculated deflection Ea.
EN - 25
EN