DT3000
Instruction Leaflet
I.B. 17555D
Effective: Date 07/02
Page 67
For more information visit:
www.cutler-hammer.eaton.com
Supersedes I.B. 17555C dated November 1999
A5.0 APPLICATION CONSIDERATIONS
Zone selective interlocking is available on the Digitrip 3001
Protective Relays for the inverse time and short time
functions on the phase and ground elements. Refer to
Figure A-8 for a typical phase zone selection interlocking
wiring diagram or Figure A-9 for a typical ground zone
interlocking wiring diagram. The terminal numbering is
different from that of the standard DT3001 Protective
Relay.
NOTES:
1. Maximum distance between first and last phase or
ground zone interconnection cable should be 250 feet.
Route separate from power conductors.
2. Jumper on devices in last zone used to provide time
delay per inverse time overcurrent or short delay time
setting. If jumper is not used the Digitrip 3001 will
initiate trip without time delay (nominally 0.1 seconds).
3. Up to 10 Digitrip devices may be wired in parallel to
provide a single upstream restraint signal.
4. Only one zone common used for both phase and
ground.
5. DO NOT CONNECT ZONE COMMON TO EARTH
GROUND.
Fig. A-8 Typical Phase Zone Selective Interlocking
Connection Diagram
Fig. A-9 Typical Ground Zone Selective Interlocking
Connection Diagram
A6.0 DRAWOUT OPERATION
A6.1 INSERTING THE RELAY
Before the Digitrip 3001 is inserted into the Drawout
Enclosure:
•
Verify that all wiring is correct as shown in the wiring
diagram.
•
Set the DIP switches per Table 5.1
When inserting the DT3001 Drawout into the Drawout
Enclosure, use the guides to align the exterior of the
device chassis with the interior of the enclosure. Slide the
unit into the Case using the guides, pressing firmly until all
four latches located on the sides of the device are seated
and latched into place. Tabs on the DT3001 Drawout Inner
Chassis will prevent the inner chassis from being inserted
upside down or being inserted into an enclosure of another
IQ product.
THE DT3001 INNER CHASSIS MUST BE FULLY
INSERTED AND FULLY LATCHED IN TO ITS
DRAWOUT ENCLOSURE FOR PROPER
OPERATION OF THE DEVICE.
When the unit is seated properly, the quick release buttons
at the top and bottom of the unit will return to their non-
