2 Using the MJ-5 Operator Panel and Controls
6
Siemens Industry, Inc.
Time Delay Key
The Time Delay set point 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 set point. Once you display the Time Delay, press the
Change/Save 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 center.
The MJ-5 control program adjusts regulator output voltage to
compensate for this drop. Specify both Resistive and
Reactive components of Line Drop Compensation.
See Appendix D.2 for instructions about calculating the line
drops.
Resistance Key
Press this key to view the Resistive LDC component. The
component is broken down into Forward and Reverse. The
first value displayed is the FWD Comp. To view the REV
Comp, press the Resistance Key again. Once you display the
Resistive LDC, (FWD or REV) press the Change/
Save key to modify the value.
Reactance Key
Press this key to view the Reactive LDC component. The
component is broken down into Forward and Reverse. The
first value displayed is the FWD Comp. To view the REV
Comp, press the Reactance Key again. Once you display the
Reactive LDC, press the Change/Save key to modify the
value.
+/- Polarity Select Key
This key is multiplexed with the Min/Max Key.
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 messages.
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 set point, and the VLC - Lower Voltage set point and
then repeat the sequence. See Section 4.4.4 for a discussion
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.
Press this key to view the Overall Contact status screen from
the <MAINTENANCE> menu. Press the key repeatedly to
scroll through the contact status screens and the settings for
the maintenance algorithm.
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