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Instruction Leaflet
For the purpose of familiarization, the panel is divided into
three sub-sections:
1.
Pushbuttons
2.
LED's
3.
Display Windows
Pushbuttons: The front operations panel supports eleven
membrane pushbuttons. Pushbuttons are color coded
(red, white, blue and yellow) by their function. Blue
pushbuttons are associated with actual program functions,
yellow pushbuttons with integral testing functions, and
white pushbuttons are common to both operations or are
independent. White pushbuttons accomplish their function
when depressed. They can be held down and not released
to accelerate their function. Blue and Yellow pushbuttons
accomplish their function after having been pressed and
released.
Reset Pushbutton (Blue)
The Reset pushbutton is used to reset any of the following:
the differential trip relay, the trip alarm relay, and the trip
LED. Reset applies to both normal operations and integral
testing.
Program Mode Pushbutton (Blue)
The Program Mode pushbutton, which is accessed by
opening the hinged access cover, is used to enter and exit
the program mode. When this pushbutton is pressed and
released, the program LED flashes and set points can be
altered.
Selections made in the program mode are only saved
when the Save Settings pushbutton, which is described
later, is depressed. When programming is concluded, the
Program Mode pushbutton should be pressed to exit the
program mode. Note that if the Save Settings pushbutton
is not depressed prior to exiting the program mode, the
previous settings will be retained. The program mode is
also exited if the Reset pushbutton is pressed or if there is
no programming activity for approximately 2-1/2 minutes.
Note: Each MD-3000 is shipped from the factory with
nominal protection settings. The user should program
the relay before putting it into service, as these
nominal values may not give optimum system
protection or coordination.
Test Mode Pushbutton (Yellow)
Also located behind the sealed hinged access cover is the
Test Mode pushbutton. This pushbutton is used to enter
and exit the test mode. When the pushbutton is pressed
and released, the word TEST will appear in the
Settings/Test Time/Trip Cause display window. If there is
more than 0.1 times (I
) current flowing in any phase, the
n
Test Mode cannot be initiated and the error message
"ERR" will appear in the display window. The test mode
will automatically exit if there is no activity for
approximately 2-1/2 minutes.
Select Test Pushbutton (Yellow)
The Select Test pushbutton is used, after the test mode
has been entered, to select the type of test.
Effective: Date 03/2006
For more information visit:
MD-3000
IB02602001E
Test Pushbutton (Yellow)
The selected test operation is initiated by pressing and
releasing the Test pushbutton.
Select Settings Pushbutton (Blue)
In the program mode, the Select Settings pushbutton is
used to step to the next set point. This pushbutton steps
forward. To step back, the Select Settings pushbutton can
be pressed and held, while pressing and releasing the
Lower pushbutton.
Raise/Lower Pushbutton (White)
The Raise and Lower pushbuttons are used during the
program and test modes to increase or decrease the value
of the displayed set point.
Save Settings Pushbutton (Blue)
While in the program mode, selected Set Points can be
saved by pressing and releasing the Save Settings
pushbutton. Settings can be saved individually or as a
group. If the Save Settings pushbutton is not used, the
previous Set Points will remain when the program mode is
exited.
View Settings Pushbutton (Blue)
The View Settings pushbutton is only functional when the
unit is in the normal operating mode. It displays the unit's
set point including the phase differential current
transformer ratio selected via programming. The software
version of the MD-3000 will be displayed after the phase
CT ratio setting, and will appear in the rms Amperes
display window with the letters "SVER".
Select Pushbutton (White)
The Select pushbutton is used to step between any of the
three phase differential current values that are displayed in
the rms ampere window.
LED: LED's are used to indicate a number of functions,
operations and/or warnings. Many of the LED's provide
different indication messages. The color and a constant on
or blinking operation determines the specific message.
Several of the LED's are bi-colored and can be lit green or
red.
Operational LED
The Operational LED at the top of the relay should be
green and blink on for approximately one second and then
off for one second. This indicates that the relay is
functioning properly in its normal operation mode. If this
LED is blinking red, it indicates the relay may need
reprogramming. If this LED is lit in any color shade other
than a definite green or red, or if it is not blinking at all, an
internal problem has been detected requiring replacement
of the relay.
Differential Pickup LED
This LED is bi-colored. While in the program mode, the
LED will blink green when the differential overcurrent
pickup set point is displayed in the Settings/Test Time/Trip
Cause window. It will be a constant green when the
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