Instruction Leaflet
DT3000
Page 28
Effective: Date 07/02
I.B. 17555D
For more information visit:
www.cutler-hammer.eaton.com
Supersedes I.B. 17555C dated November 1999
Fig. 3-10 Programming Sequence Preview
The flow chart entitled “Local Programming Sequence
Flow Chart” (Figure 3-11) presents details of the
programming function. A specific setting decision is called
for at each DIAMOND SHAPED decision point. After a
decision is made the “Select Settings” pushbutton is
pressed and released to move to the next setting in the
programming order.
3-3.4 TEST MODE
The Test Mode is not intended for live primary current
interruption, but periodic tests that verify the functional
performance of the relay. To enter the Test Mode, open
the protective access cover. Press and release the Test
Mode On/Off pushbutton. The following should be verified
before proceeding:
1. The word TEST appears in the alphanumeric display.
2. The Test LED is blinking green.
3. The rms Amperes is blank.
4. An error message (ERR) does not appear in the
alphanumeric display.
If there is greater than 0.1 per unit of current flowing on
either a phase or ground circuit, the error message (ERR)
will appear and there will be an automatic exit from the
Test Mode. This maximum current value can be
determined by multiplying 0.1 times the Ct primary current
amperes rating.
Tests can be done on both phase and ground elements.
For either of these tests a trip or no trip mode can be
selected. A trip test will activate the trip coil while a no trip
test exercises the trip function without activating the trip
coil.
When in the Test Mode, the Select Tests pushbutton is
pressed and released to step between the four groups of
settings shown vertically in Table 2.2.
The Raise and Lower pushbuttons will move the display
between the set points for each of the four groups. Within
a group, the set points move horizontally (Table 2.2).
Pressing and releasing the Test pushbutton will initiate the
selected test.
When the initiated test is complete, the appropriate front
panel LED’s will be red to indicate the cause of the trip.
The alphanumeric display shows the time to trip, and the
numeric display shows the magnitude of the trip current.
The Test Mode can be exited as follows:
1. Press and release the Test Mode On/Off pushbutton.
2. Press and release the Reset pushbutton.
3. Perform no testing activity for approximately 2 ½
minutes.
3-4 COMMUNICATIONS FUNCTION
The communication function can deliver all the data and
flags that can be viewed locally on the relay to a host
computer equipped with an appropriate software package.
In addition, the host computer can initiate a
“Communication Trip” and “Communication Close” control
type command.
The Digitrip 3000 Protective Relay has a built in INCOM
communication network port that is available on terminals
1 and 2 of TB2. The device Address and the desired
BAUD Rate are programmed using the following
pushbuttons located on the front panel: Select Tests, Test,
Raise and Lower and Select Settings.
(First Step) Program the
Phase Curve Shape
(Last Step) Program the
Ground Ct Ratio
Program the
Ground Short
Delay Time
Program the
Phase Ct
Ratio
Program the
Frequency
Program the
High Load
Time
Program the
Ground
Instantaneous Pickup
Program the
Ground Short
Delay Pickup
Program the
Ground
Inverse Time Overcurrent
Time Multiplier
Program the
Ground
Inverse Time Overcurrent
Pickup
Program the
Ground Curve
Shape
Program the
Phase
Instantaneous Pickup
Program the
Discriminator
ON/OFF
Program the
Phase Short
Delay Time
Program the
Phase Short
Delay Pickup
Program the
Phase Inverse
Time Overcurrent Time
Multiplier
Program the
Phase Inverse
Time Overcurrent Pickup
