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1
Introduction
Communications
The MJ-4 panel provide local communications via the
front-panel data port, and supports remote communica-
tions with the MJ-4 Communications Module.
Barrier Terminal Strips
Terminal contacts on the back of the MJ-4 Control Panel
allow for external control over certain functions such as
VRC activation and tap changing. These terminals can be
used to provide an electrical interface to a SCADA system
for remote control applications and/or other desired con-
trol functions.
1.3
Mounting on Siemens Regulators
The MJ-4 Control Panels are mechanically and electrically
compatible and interchangeable with earlier MJ, IJ and SJ
series and earlier control units. They can be mounted in
the existing enclosure by simply swinging the control to
be replaced outward on its hinges, disconnecting the
polarized disconnect switch (PDS), then removing the unit
and inserting the new unit. (See Appendix B.)
1.4
Mounting on Cooper Regulators
A retrofit kit is available for mounting the MJ-4 Control
Panels on Cooper regulators. The kit includes all of the
necessary hardware and complete instructions for mount-
ing and connecting the MJ-4 to the regulator. The retrofit
is accomplished without the necessity of replacing the
waterproof housing. See the Retrofitting Cooper Regula-
tors Application Note for details.
Contact your Siemens representative for ordering informa-
tion.
1.5
Mounting on GE Regulators
A retrofit kit is available for mounting the MJ-4 Control
Panel on GE regulators. The kit includes all of the neces-
sary hardware and complete instructions for mounting and
connecting the MJ-4 to the regulator. The retrofit is
accomplished without the necessity of replacing the
waterproof housing. See the Retrofitting GE. Regulators
Application Note for details.
Contact your Siemens representative for ordering informa-
tion.
1.6
Mounting on Load Tap Changers
A retrofit kit is available for mounting the MJ-4 Control
Panels on LTCs. The kit includes all of the necessary hard-
ware and complete instructions for mounting and connect-
ing the MJ-4 to the LTC.
Contact your Siemens representative for ordering informa-
tion.
2
1.7
Support Documentation
In addition to this manual, Siemens provides a number of
supporting documents that provide details about the use
of Siemens regulators and control products.
Contact your Siemens representative or visit the Siemens
T&D website for a complete list of Application Notes and
other supporting documentation.
1.8
Siemens Website
The Siemens website contains information about all of the
Siemens transmission and distribution products, including
regulators and controls.
All voltage regulator products can be located on the Volt-
age Regulator product page after navigating to the Sie-
mens PT&D website below:
http://www.usa.siemens.com/energy
Browse this section for information about the regulators,
regulator accessories, upgrades, downloadable files, and
more.
1.9
Control Panel Type
There are two models of Voltage Regulator control panels
described in this manual: the MJ-4A and the MJ-4B.
The MJ-4A has discrete three position switches for the
Auto-Manual functionality and Raise/Lower. The MJ-4B
has push buttons for the above functionalities.
This manual is written describing the features of the con-
trol panel in general and in specific sections the differ-
ences between the MJ-4A and MJ-4B are explained.
Siemens Energy, Inc.
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Troubleshooting
