Switches; Binding Posts - Siemens MJ-5 Installation And Operation Manual

Table 2.3 VRC Indicator Flash Patterns
Flashing Patter
Local
On Active
long-short
long-short-short
long-short-
short-short
Neutralite Indicator
The Neutralite indicator illuminates when the tap changer is
in the Neutral position. The Neutralite indicator also
illuminates when the Neutralite Test key is pressed and
held.
Rx-In Indicator
The Rx-In indicator illuminates to indicate Control has
received date from the RTU.
Tx-Out Indicator
The Tx-Out indicator illuminates to indicate the Control
has transmitted data from the RTU.

2.5 Switches

Power Switch
This three-position switch selects the power source for the
MJ-5 Control Panel.

In the upper (Normal) position, the regulator
Utility (tertiary) winding provides power through
the polarized disconnect switch (PDS).

In the lower (External Source) position, the
External Source terminals (described below)
provide power.

In the middle (Off) position, the Control Panel is
turned off. This is also called the By-Pass
Position.
Tap Control Switches (Mode Select Switches)
Auto/Off/Manual Switch
In the MJ-5 panel, the 3 position discrete switch, has the
Center = OFF, Down = Manual and Up = Auto
functionalities. When in Auto, the panel may be switched
between Auto-Remote or Auto-Local modes by pressing
the Remote / Local push button.
Tap Control Modes

Manual / Auto Disabled (By-Pass Position): The
operator has control of the regulator's tap changer
motor; automatic tap changes are disabled. In this
mode, a local operator can use the Raise and
Lower switches or push buttons to adjust the tap
position or a remote operator could control the
tap motor.
Siemens Industry, Inc.
VRC Modes
Remote Remote Auto
(MJ-X) (MJ-3A)
Stage-1 Step 1 Set 1
Stage-2 Step 2 Set 2
Stage-3 Step 3

Auto Enabled. The microprocessor has control of
the tap changer motor and local manual tap
changes are disabled.
Remote / Local Push Button
This push button determines whether the MJ-5 Control
Panel is under local control or remote control. Note that the
ultimate determination of the point of control is established
manually; this switch setting cannot be overridden from a
remote location.
•
Remote Disabled. In this mode, a remote operator can
obtain MJ-5 Control Panel data. However, the remote
operator cannot make configuration changes or exercise
control of the tap changer motor.
•
Remote Enabled. In this mode, a remote operator has
access to all functions available to the local operator,
including the ability to override automatic control of the
tap changer motor.
Raise and Lower Switches
When the Auto Manual Switch is in Manual Mode, this
discrete switch activates the Tap changer motor to raise or
lower the Tap position.
Switch Positions for Bypassing
The front panel switches must be in the following positions
before bypassing the regulator.
•
Auto / Manual - OFF
•
Remote/Local push-button- Remote Disabled LED is
ON
• Power Switch – OFF
Possible explosion if bypassed while
not on neutral.
Will cause death, serious injury, or
property damage.
To prevent:
Place regulator in neutral position
before bypassing and disable control
panel. See Appendix E for details.

2.6 Binding Posts

Front panel binding posts are dual banana-style
receptacles on standard 0.74 inch centers.
External Source Binding Posts
These binding posts can be used to apply 120 V from an
external power source to the MJ-5 Control Panel when the
power source switch is in the External Source position. The
binding posts are dual banana-style receptacles. Ensure that
any voltage source attached to these binding posts is
properly polarized.
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