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emergency regulator in the event of failure of the voltage regulator. The limiter
functions are not active in this mode.
4.2.3 Mechanical installation
If the AVR is delivered as a separate item, the unit should only be installed in
indoor areas which are dry and dust-free and do not contain any gases, acid fumes
or similar.
4.2.4 Earthing and wiring
The emission limits in accordance with standard EN 50081-2 (1993) will only be
complied with if the connections for the power electronics supply and the field
output are made using shielded cables earthed at each end. We also recommend
that shielded cables are used for the analog and digital connections.
4.3 Electrical connections
4.3.1 General information
The safety information in
Chapter 1.5. General Safety
and
Chapter 1.6. Safety
Instructions
must be observed at all times. Study the connection diagrams
delivered with the machine before starting the installation, see
Annex 3. Main
Connection Drawing, Annex 4. Connection Instructions, Annex 10. Option
Connection Drawing, Annex
and
11. Layout of connection.
For optional
PMG-unit, see
Annex 9. Permanent Magnet Regulator (PMG) User's Manual.
Before you start the installation:
•
Verify that voltages and the frequencies indicated on the rating plate of the
machine and in
Annex 8. Technical Specification
are correct.
•
Make sure that the sizes of input cables are adequate for the maximum load
current and in accordance with local standards.
•
Make sure that cable terminations are of appropriate type and of correct size.
•
Check the connections of all devices, such as temperature probes.
NOTE: Prior to installation it is important to check that the incoming cables are
not connected to the supply network. The cables should be grounded.
4.3.2 Connection of main power cables and neutral cable
The main terminal box is typically supplied undrilled as the size and number of
the customer’s cables is unknown. The customer or a third party is therefore
responsible for this.
The stator terminals are marked with the letters U, V and W according to IEC
60034-8. Stripping, splicing and insulating of the cables must be performed in
accordance with the instructions delivered by the cable manufacturer. The lugs
should not be permanently tightened by bus bars, but only attached (for checking
of insulation resistance).
The cables must be supported so that no stress is applied to the bus bars in the
terminal box.
When three-phase cables are used, the prescribed distance must be maintained
between the leads at intersections. Bracing and spacers should be used if
necessary.
Check the phase sequence, see
Figure 4-1. Phase sequence (IEC
).
