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Chapter Objectives
1391 Transformers
Transformers and Shunt Regulators
Chapter 10 provides general information about the 1391 Isolation
Transformer. In addition, shunt regulator information is also provided.
The 1391-DES must operate from an isolation transformer having a
three-phase, 230V AC output and a single-phase, 36V AC output.
Transformers supplied with the 1391-DES can provide power for up to four
drives. Standard three-phase input voltages for the 60 Hz units are
available. The kVA values specified are the continuous outputs of the units
in a 60 C ambient.
Important: The maximum rating that can be connected to the 1391-DES is
15 kVA.
Important: The 1391-DES drive uses a 36V AC transformer tap to
provide power to the Logic Control Board. It is recommended that a 1391
Isolation Transformer be used. Contact your local Allen-Bradley Sales
Representative if a transformer of a different type must be used. Refer to
Figure 10.1 and Appendix B for connection information.
60 Hz Transformers
Two 60 Hz transformers are available and have input ratings of:
1. 240/480V AC , three-phase
2. 208/230/460/575V AC, three-phase
50/60 Hz Transformers
The 50/60 Hz transformer that is available has an input rating of
240/380/415/480V AC, three-phase.
NEMA Type 1 Enclosure
Dimensions for the NEMA Type 1 enclosures are shown in Appendix A.
Important: The NEMA Type 1 enclosure is shipped as a kit for customer
assembly.
If other input voltages or special enclosures are required, consult your local
Allen-Bradley Sales Representative. Refer to Figure 10.1 for connection
information and Appendix A for dimensions.
Chapter
10
10-1
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