Instruction Leaflet
DT3000
Page 14
Effective: Date 07/02
I.B. 17555D
For more information visit:
www.cutler-hammer.eaton.com
Supersedes I.B. 17555C dated November 1999
2-2 PROTECTIVE RELAY HARDWARE
2-2.1 FRONT OPERATIONS PANEL
The operations panel, which is normally accessible from
the outside of the switch gear panel door, provides a
means to program, monitor and test the unit (Figure 1-1).
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. For example, 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 trip relays (overcurrent and instantaneous), the trip
alarm relay, the trip LED’s, and the ampere demand
current. Reset applies to both normal operations and
integral testing. If the unit is in the auto-reset mode, as set
by DIP switch #9 on the back of the unit, the trip relays and
the trip alarm relay will automatically reset when the circuit
breaker is opened after a trip.
Program Mode Pushbutton (Blue)
The Program Mode pushbutton, which is accessed by
opening, 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.
DIP Switch S2 establishes when the Program Mode can be
entered. With S2 set to “off,” the Program Mode can only
be entered when the breaker is open. With S2 set to “on,”
the Program Mode can be entered with the breaker open
or closed.
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 Digitrip 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
n
) current flowing in either the phase
or the ground circuit, the 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. There are
phase and ground tests to trip or not trip the breaker (See
Section 3-3.4).
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 and ground current
transformer ratio selected via programming. The software
version of the DT3000 will be displayed after the ground 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
eight current values that are displayed in the rms ampere
window. The eight currents are IA, IB, IC, IG, IA ampere
demand, lB ampere demand, IC ampere demand, and IG
ampere demand. The currents displayed are the present
rms values. The ampere demand currents are the
averaged RMS values sensed over a 5-minute period of
