Instruction Leaflet
DT3000
Page 16
Effective: Date 07/02
I.B. 17555D
For more information visit:
www.cutler-hammer.eaton.com
Supersedes I.B. 17555C dated November 1999
1. The present phase or ground currents.
2. The largest phase or ground demand currents since
last reset.
3. The fault current (displayed after a trip until a reset
action is initiated).
4. The phase and ground current transformer Ct setting
(when “View Settings” pushbutton is used with the
relay in the normal operating mode).
Settings/Test Time/Trip Cause Window
This window is a four character alphanumeric display used
to show the value of the Set Points, the test time and the
cause of trip.
2-2.2 REAR ACCESS PANEL
THE BACK OF DIGITRIP 3000, WHEN
ENERGIZED, OFFERS EXPOSURE TO LIVE
PARTS WHERE THE HAZARD OF A FATAL
ELECTRIC SHOCK IS PRESENT. ALWAYS
DISCONNECT SOURCE AND CONTROL POWER
SUPPLY BEFORE TOUCHING ANYTHING ON THE
REAR OF THE DIGITRIP 3000. FAILURE TO DO
SO COULD RESULT IN INJURY OR DEATH.
The rear access panel of Digitrip 3000 is normally
accessible from the rear of an open panel door. All wiring
connections to the Digitrip 3000 Protective Relay are made
at the chassis’ rear. For the sake of uniform identification,
the frame of reference used when discussing the rear
access panel is facing the back of the relay. The DIP
switches, for example, are located on the upper left of the
rear panel (Figure 1-3). Become familiar with the functions
and connections involved, especially the following:
DIP Switches:
A set of ten DIP switches is located in the
upper left portion of the rear panel. Refer to Table 5.1 for
DIP switch positions. Their basic functions are as follows:
•
Switch S1 is used to select whether the IMPACC
buffers are set for the Digitrip 3000 configuration or
the Digitrip MV configuration. (Refer to Section 5: for
configuring the Digitrip 3000 as a replacement for a
Digitrip MV.)
•
Switch S2 is used to enable/disable the ability to
program the Set Points when the breaker is in the
open or closed position. CARE MUST BE TAKEN
WHEN PROGRAMMING THE DIGITRIP 3000 WHILE
THE BREAKER IS CLOSED AND CURRENT IS
FLOWING. AN INCORRECT SETTING
CONFIGURATION COULD CAUSE THE RELAY TO
TRIP THE BREAKER WHEN SETTINGS ARE
SAVED.
•
Switch S3 is used to configure the trip contacts as
shown below:
Trip
Contacts
Dip Switch OFF
Position
Dip Switch ON
Position
TB 12 & 13
Phase & Ground
Trip Inst.
Ground Trip Inst./OC
TB 14 & 15
Phase & Ground
Trip
OC/Communications
Phase Trip Inst./OC/
Communications
•
Switch S4 is used to enable/disable the ability to open
or close the breaker remotely from the
communications interface (host computer).
•
Switch S5 is used to configure the Communication
Close output relay at terminals TB2-4 & TB2-5. When
S5 is in the “On” position the output relay is
programmed for High Load Alarm. When S5 is in the
“Off” position the output relay is programmed for
Communications Close.
•
Switch S6 is used to configure the zone interlock
input. When the “Zone Input” switch S6 is in the “On”
position, the zone interlock input is latched for
compatibility with low voltage trip units as in the
existing DT3000. The latched Zone Interlock option
will not execute a Zone Interlock Fast Trip until the
downstream relay stops sending the zone interlock
signal and the current drops below the pickup level
settings. When switch S6 is in the “Off” position, the
zone interlock input is unlatched for faster tripping.
The unlatched Zone Interlock option executes Zone
Interlock Fast Trip when the downstream relay stops
sending the zone interlock signal. Use the latched
option for co-ordination with self-powered trip units.
Self-powered trip units stop sending the zone interlock
signal when the trip signal is issued. Latching of the
DT-3000 zone interlock input provides the needed co-
ordination time for the downstream breaker to open.
•
Switch S7 is used to select between a 52a and a 52b
input to determine breaker state. When S7 is in the
“On” position, the breaker status is based on the 52a
input. When S7 is in the “Off” position, the breaker
status is based on the 52b
input. The OFF/52b
configuration is the default mode. The breaker state
determination is used for the following purposes in the
DT3000:
1. Test the number of cycles the breaker has been
closed for Discriminator operation.
2. Determine the breaker state for setting change
permission if S2 is set to “Program with Breaker
Open Only”.
3. Report breaker state to PowerNet.
The 52b contact is open when the breaker is closed
and closed when the breaker is open. The 52a
contact is closed when the circuit breaker is closed
and open when the breaker is opened or racked out.
The 52a option has the benefit of properly reporting
breaker state when the circuit breaker is racked out.
WARNING
