Eaton Cutler-Hammer Digitrip 3000, Instructions For Installation, Operation And Maintenance, Page: 41 / 92

I.B. 17555C
Effective November 1999
Page 35
SECTION 5: INSTALLATION, STARTUP AND
TESTING
5-1 INTRODUCTION
This section describes mounting, wiring, startup and mis-
cellaneous testing details associated with the Digitrip
3000 Protective Relay.
WARNING
INSURE THAT THE INCOMING AC POWER AND FOR-
EIGN POWER SOURCES ARE TURNED OFF AND
LOCKED OUT BEFORE PERFORMING ANY WORK
ON THE DIGITRIP 3000 TRIP UNIT OR ITS ASSOCI-
ATED EQUIPMENT. FAILURE TO OBSERVE THIS
PRACTICE COULD RESULT IN SERIOUS INJURY,
DEATH AND/OR EQUIPMENT DAMAGE.
5-2 PANEL PREPARATION
This section describes the panel preparation and mount-
ing of the Digitrip 3000 Protective Relay.
5-2.1 CUTOUT
Since the Digitrip 3000 Protective Relay is typically
mounted on a cabinet door, it is necessary to prepare a
cutout in which it will be placed. The dimensions for this
cutout, along with the location of the six mounting holes,
are shown in Figure 5-1. Before actually cutting the
panel, be sure that the required 3-dimensional clear-
ances for the relay chassis allow mounting in the desired
location. Digitrip 3000 Protective Relay dimensions are
shown in Figure 5-2.
It is necessary to hold the tolerances shown when mak-
ing the cutouts and placing the holes for the mounting
screws. In particular, the horizontal dimensions between
the center of the mounting holes and the vertical edge of
the cutout must be within 0 and +0.050 in. (0.13 cm).
5-2.2 MOUNTING
Do not use a tap on the face of the relay since this will
remove excessive plastic from the holes, resulting in less
threaded material to secure the relay to it mounting
panel.
Place the Digitrip 3000 Protective Relay through the cut-
out in the panel. Be sure the Operator Panel faces out-
ward. Use the 0.38 in. (0.9 cm) long screws included with
the relay to mount the unit on a single-thickness panel.
Fig. 5-1 Cutout Dimensions (Inches)
Be sure to start the screws from INSIDE the panel, so
they go through the metal first.
5-3 REPLACING DIGITRIP MV WITH DIGITRIP 3000
The Digitrip 3000 can be installed as a direct replace-
ment for the Digitrip MV with proper DIP switch settings
as shown in Table 5.1. The five following important points
must be considered when configuring a Digitrip 3000 to
function as a Digitrip MV.
1. DIP switches S1, S2 and S3 must be set to the OFF
position.
2. The selected curve shape must be It, I
2
t, I
4
t or FLAT.
3. The phase and ground curves must be set the same.
4. The CT settings must be set from the front panel.
They cannot be set via IMPACC.
5. The thermal curves only are used for system coordi-
nation.