Chapter 3 - Installation and Alignment
3.3 Machine preparations before installation
Prepare the machine for installation as follows:
• Measure the insulation resistance of the winding before any other preparations are done as described in Chapter 3.3.1 Insulation resistance measurements
• Remove the transport locking device when applicable. Store it for future use. See Chapter 3.3.2 Disassembly of the transport locking device for further instructions
• Verify that the grease available is according to the specification on the bearing plate, see Chapter 2.1.2 Bearing plate. Additional recommended greases can be found in Chapter 7.5.3.5 Bearing grease
***Following bullet and note for bearing type: Sleeve bearing
• Fill the sleeve bearings with an appropriate oil. For suitable oils, see Chapter 7.5.2.4 Oil qualities
NOTE: Sleeve bearings are always delivered without oil!
• Remove the anti-corrosive coating on the shaft extension, and machine feet with white spirit
• Install the coupling half as described in Chapter 3.3.4 Assembly of the coupling half
• Check that the drain plugs at the lowest part of both ends of the machine are in open position, see Chapter 3.3.6 Drain plugs.
3.3.1 Insulation resistance measurements
Before a machine is started up for the first time, after a long period of standstill or within the scope of general maintenance work, the insulation resistance of the machine must be measured.
This includes measuring the stature winding and all auxiliary devices. For machines equipped with slip ring, the measuring also includes the rotor winding, see Chapter 7.6.4 Insulation resistance test.
3.3.2 Disassembly of the transport locking device
Some machines and all machines with sleeve or roller bearings have transport locking devices installed. For machines with sleeve or cylindrical roller bearings, the transport locking device is made of a steel bar attached to both the bearing shield on the D-end and to the end of the shaft extension.
The transport locking device has to be removed prior to installation. The shaft extension has to be cleaned of its anti-corrosive coating. The locking device should be stored for future use.
NOTE: In order to avoid bearing damages, the transport locking device must be fitted to the machine whenever the machine is moved, transported to another location or stored. See Chapter 2.1 Protective measures prior to transport.
3.3.3 Coupling type
***Following paragraph for bearing type: Rolling bearing
Machines with rolling bearings must be connected to the driven machine with flexible couplings, e.g. pin couplings, or gear couplings.
If the axially locked bearing is at the N-end (see dimension drawing), make sure that a continuous free axial movement is possible between the coupling halves in order to permit thermal expansion of the machine shaft without damaging the bearings. The expected axial thermal expansion of the rotor can be calculated as defined in the Chapter 3.6.4 Correction for thermal expansion.
***Following paragraph for mounting type: Vertical
Vertical machines may be designed to carry some load from the shaft of the driven machine. If this is the case, the coupling halves have to be locked against slipping in the axial direction by a lock plate on the end of the shaft.
NOTE: The machine is not suitable for belt, chain or gear connection unless it is specifically designed for such use. The same applies for high axial thrust applications.
***Following two paragraphs and figure for bearing type: Sleeve bearing with axial float
The sleeve bearing construction allows the rotor to move axially between the mechanical end float limits. Standard bearings cannot withstand any axial forces from the driven machine. Any axial force from the load will cause bearing damage. Therefore, all axial forces must be carried by the driven machine and the coupling must be of limited axial float type.
3.3.4 Assembly of the coupling half 3.3.4.1 Balancing of coupling
The rotor is dynamically balanced with half key as standard. The way of balancing is stamped to the shaft end:
• H = half-key and
• F = full key
The coupling half must be balanced respectively.
3.3.4.2 Assembly
The following instructions must be taken into account when assembling the coupling half.
• Follow the general instructions of the coupling supplier
• The weight of the coupling half can be considerable. A suitable lifting gear may be needed
• Clean the shaft extension of its anti-corrosive coating, and check the measurements of the extension and the coupling against the provided drawings. Ensure also that the keyways in the coupling and the shaft extension are clean and free from burrs
• Coat the shaft extension and hub bore with a thin layer of oil as to facilitate the mounting of the coupling half. Never coat mating surfaces with molybdenum disulphide (Molykote) or similar products
• The coupling must be covered with a touch guard.
NOTE: In order not to damage the bearings, no additional forces should be applied to the bearings when assembling the coupling half.
3.3.5 Belt drive
Machines designed for belt drives are always equipped with cylindrical roller bearing in the D-end. If a belt drive is used, make sure that the driving and the driven pulleys are correctly aligned.
NOTE: Suitability of the shaft end and the bearings for the belt drive must be always checked before use. Do not exceed the radial force specified in the order definitions.
3.3.6 Drain plugs
The machines are equipped with drain plugs in the lowest part of the machine. The drain plug is constructed in such a way that it keeps the dust outside the machine and lets the condensation water to drain out. The drain plugs should always be open, i.e. half of the plug is inside and half of the plug is outside. The drain plug is opened by pulling it out from the frame. In AMI machines the drain plug (M12 screw) is opened 6 - 12 mm (0.2” - 0.5”).
***Following paragraph for mounting type: Horizontal
For horizontal machines, two drain plugs are fitted at both ends of the machine.
***Following paragraph for mounting type: Vertical
For vertical machines, two drain plugs are fitted to the lower end shield.
The main terminal box has one drain plug at the lowest part of the box which has to be closed during operation.