Switches - Siemens MJ-XL Installation And Operation Manual

2
Using the MJ-XL Operator Panel and Controls
the control program is returning the tap position to Neu-
tral.
Band Indicator Status
Table 2.2
Power Flow Band Indicator Status
Mode
RPF active
and current
magnitude
exceeds I
Threshold %
Neutral R Flash
Idle R Flash
Co-Gen On solid
Bi-Dir On solid
F Lock Flash
R Lock On solid
In the above table, the indicator that is flashing or is on
solid is the respective Band Indicator (High, Low, or In
Band). If all band indicators are off, it is an indication that
Voltage Limit Control (VLC) is active, and compensated
regulator output voltage is higher than the VLC upper
limit, or lower than the VLC Lower limit.
MJ-XL Band Indicators
VLC Upper
VLC Upper
1 v
Voltage Level
Setpoint
1 v
VLC Lower
VLC Lower
Band Indicators and VLC Indicators
Figure 2.2
8
RPF or FPF FPF active
with current and current
magnitude magnitude
below I exceeds I
Threshold %, Threshold %
but not = 0
Flash On solid
Flash On solid
Flash On solid
Flash On solid
On solid On solid
On solid Flash
Indicator
"High" Band
Indicator
"In-Band"
Bandwidth
Indicator
"Low" Band
Indicator
Indicator
Raise and Lower LED Indicators
The Raise indicator is on whenever the tap changer motor
is raising the tap position. The Lower indicator is on when-
ever the tap changer motor is lowering the tap position.
Voltage Limit Control LED Indicators
The Voltage Limit Control (VLC) indicators illuminate to
indicate that VLC is active. With the VLC upper limit acti-
vated, the VLC Upper indicator is illuminated. If the VLC
lower limit is activated, the VLC Lower indicator is illumi-
nated.
If VLC is active, and Vld is within 1 volt of the VLC limit,
the appropriate VLC and Band Indicator will both be illumi-
nated.
Voltage Reduction Control Active Indicator LED
This indicator is illuminated whenever Voltage Reduction
Control is in effect. The VRC LED indicator flashes a
unique pattern to indicate which stage, step, or set is
active, depending upon the VRC Mode as described in
Table 2.3. (See Section 4.4.3 for more information.)
VRC Indicator Flash Patterns
Table 2.3
Flashing
Pattern
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 illu-
minates when the Neutralite Test key is pressed and held.
2.5

Switches

Power Switch
This three-position switch selects the power source for
L
the MJ-X Control Panel.
• In the upper (Normal) position, the regulator Utility
(tertiary) winding provides power through the polar-
ized disconnect switch (PDS).
• In the lower (External Source) position, the External
Source terminals (described below) provide power.
• In the middle (Off) position, the MJ-X
is turned off. This is also called the By-Pass Position.
Siemens Power Transmission & Distribution, Inc.
VRC Modes
Remote Remote Auto
(MJ-XL) (MJ-3A)
Stage-1 Step 1 Set 1
Stage-2 Step 2 Set 2
Stage-3 Step 3
L
Control Panel