DT3000
Instruction Leaflet
I.B. 17555D
Effective: Date 07/02
Page 15
For more information visit:
www.cutler-hammer.eaton.com
Supersedes I.B. 17555C dated November 1999
time. The demand value is the largest 5-minute average
measured since the ampere demand was last reset.
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.
High Load LED
The High Load LED will blink green when high load
settings are being selected in the program mode. The High
Load LED will blink red (in operational or test modes) when
a load current reaches 85% or reaches above the inverse
time overcurrent phase pick-up setting. If the load current
remains at 85% or remains above the inverse time
overcurrent phase pickup setting for the time interval
setting, the LED will change to steady red at the end of the
time interval. Whenever the load current drops below the
85% level, the timer will reset and the LED will turn off.
Communication Trip LED
This LED will be a constant red when the master computer
has tripped the breaker via INCOM. The LED will turn off
when the Reset pushbutton is pressed or the circuit
breaker is re-closed.
Curve Shape LED
This LED will blink green when the slope set point is
displayed in the Settings/Test Time/Trip Cause window
while in the program mode. When the curve shape set
point is being viewed in the unit’s normal operating mode,
this LED will be a continuous green.
Time Overcurrent Setting LED
This LED is bi-colored. While in the program mode, the
LED will blink green when the inverse time overcurrent
pickup set point is displayed in the Settings/Test Time/Trip
Cause window. It will be a constant green when the inverse
time overcurrent pickup set point is being viewed in the
unit’s normal operating mode. The LED will blink red
whenever the load current exceeds the inverse time
overcurrent pickup set point. If the relay trips on inverse
time overcurrent, the LED will be continuous red.
Inverse Time Overcurrent Time LED
This LED will blink green, while in the program mode, when
the LED time overcurrent time set point is displayed in the
Settings/Test Time/Trip Cause window. When the time
multiplier is being viewed in the unit’s normal operating
mode, the LED is a constant green.
Short Delay Setting LED
This LED is bi-colored and operates like the time
overcurrent setting LED.
Short Delay Time LED
The short delay time LED, when lit is green, and operates
like the inverse time overcurrent time LED.
Instantaneous LED
This LED is bi-colored and operates like the inverse time
overcurrent setting LED.
Phase LED
The phase LED is bi-colored. The LED will blink green
when the phase inverse time overcurrent setting, inverse
time multiplier, short delay setting, short delay time, and
instantaneous Set Points are displayed in the Settings/Test
Time/Trip Cause window while in the program mode.
When these Set Points are viewed in the normal operating
mode, this LED will be a constant green. The LED will blink
red, along with the time overcurrent setting LED, when the
phase load current exceeds the inverse time overcurrent
pickup set point. The LED will be a constant red, when the
phase inverse time overcurrent initiates a trip, a short
delay, or instantaneous protective functions.
Ground LED
The ground LED is also bi-colored and operates exactly
like the phase LED for all functions associated to ground.
Ampere Demand LED
This LED will be a constant green when an ampere
demand current is being viewed in the rms ampere
window.
I
A
, I
B
, I
C
, I
G
LED’s
The specific phase or ground current LED’s will be a
constant green when that phase or ground current is being
displayed in the rms ampere window. When the Ampere
Demand LED is also lit, the displayed current is the
Ampere Demand Current.
Program LED
This LED is a constant green when the relay is in the
program mode.
Test LED
This LED is a constant green when the relay is in the test
mode.
Display Windows:
Two windows are used to display the
relay’s data, Set Points and messages. One window is
located in the upper portion of the relay’s faceplate and is
labeled RMS Amperes. A second window is located in the
lower portion of the faceplate adjacent to the program and
test LED’s. It is labeled Settings/Test Time/Trip Cause.
RMS Amperes Window
This window has a five digit numeric display and shows:
