2 Using the MJ-4A & MJ-4B Operator Panel and Controls
Siemens Energy, Inc. 7
Time Delay Key
The Time Delay setpoint defines the amount of time you
want the controller to wait (after regulator output voltage
has fallen outside the Bandwidth limit) before activating
the tap changer motor. Use this key to view the Time
Delay setpoint. Once you display the Time Delay, press
the Change key to modify the value.
Line Drop Compensation Fast-Path Keys
Line Drop Compensation (LDC) defines your estimate of
the voltage drop between the regulator and the load cen-
ter. The MJ-4
control program adjusts regulator output
voltage to compensate for this drop. Specify both Resis-
tive and Reactive components of Line Drop Compensa-
tion. See Appendix D.2 for instructions about calculating
the line drops.
Resistance Key
Press this key to view the Resistive LDC component.
Once you display the Resistive LDC, press the Change
key to modify the value.
Reactance Key
Press this key to view the Reactive LDC component. Once
you display the Reactive LDC, press the Change key to
modify the value.
+/- Polarity Select Key
While in the Change mode, press this key to define the
polarity of either the Resistive or Reactive LDC compo-
nent.
Other Fast-Path Keys
Alert Key
Press this key to view the contents of the <ALERTS>
Menu. If any Alert messages are active, press this key
repeatedly to step through them in order of priority. If no
Alerts are active, the message “No Active Alerts” will be
displayed. Section 5.8 contains additional information on
how to determine the meaning of the various Alerts, and
how to acknowledge them.
Press the Cancel/Reset Key to acknowledge the mes-
sages.
Voltage Reduction Control (VRC) Key
Press this key to view the Voltage Reduction Control data
items. The first data item in that function is VRC status.
Press this key repeatedly to step through the VRC settings
(Local % reduction, Stage 1-3, VRC Remote, etc.) and
then return to VRC Mode and repeat the sequence. See
Section 4.4.3 for a discussion of these data items.
Voltage Limit Control (VLC) Key
Press this key to view the VLC Enable data items. Press
the VLC key repeatedly to step through the VLC - Upper
Voltage setpoint, and the VLC - Lower Voltage setpoint
and then repeat the sequence. See Section 4.4.4 for a dis-
cussion of these data items.
Operation Counter (Op Count) Key
Press this key to select the <COUNTERS> Menu. The
first parameter displayed is the Total Operations count.
Press this key repeatedly to step through the
<COUNTERS> Menu data items. See Section 5.7 for a
discussion of this Menu.
Maintenance Key
Press this key to view the Overall Contact status screen
from the <MAINTENANCE> menu. Press the key repeat-
edly to scroll through the contact status screens and the
settings for the maintenance algorithm.
Time
Delay
Resis-
tance
Reac-
tance
+/-
Alert
VRC
Select
VLC
Select
Op
Count
Mainte-
nance
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