Transformers and shunt regulators – Rockwell Automation 1391ES AC Servo Controller User Manual

Page 56

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9

Chapter

9-54

Transformers and Shunt Regulators

Chapter Objectives

Chapter 9 provides general information about the 1391 Isolation
Transformer. In addition, shunt regulator information is also provided.

1391 Transformers

The 1391B-ES must operate from an isolation transformer having a
three-phase, 230V AC output and a single-phase, 36V AC output.

Transformers supplied with the 1391B-ES can provide power for up to four
controllers. 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 1391B-ES is
15 kVA.

Important: The 1391B-ES controller uses a phase sensitive 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 9.1 and Appendix B for connection
information.

ATTENTION: Damage to the controller will result if the center
tap wire (Y2, Y5, Y8, Y11) shown in Figure 9.1 is not
connected to TB4-20 as shown in Appendix B.

!

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

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