Instruction Leaflet
MD-3000
Effective: Date 03/2006
IB02602001E
For more information visit:
www.EatonElectrical.com
Initial Release
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
any phase, 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.
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 choose between the trip (P3T)
and no trip (P1) tests.
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.
SECTION 4: INSTALLATION, STARTUP AND TESTING
4-1 INTRODUCTION
This section describes mounting, wiring, startup and
miscellaneous testing details associated with the MD-3000
Protective Relay.
INSURE THAT THE INCOMING AC POWER AND
FOREIGN POWER SOURCES ARE TURNED OFF
AND LOCKED OUT BEFORE PERFORMING ANY
WORK ON THE MD-3000 OR ITS ASSOCIATED
EQUIPMENT. FAILURE TO OBSERVE THIS
PRACTICE COULD RESULT IN EQUIPMENT
DAMAGE, SERIOUS INJURY AND/OR DEATH.
4-2 PANEL PREPARATION
This section describes the panel preparation and mounting
of the MD-3000 Protective Relay. If you are using the MD-
3001 Drawout Relay please refer to Appendix A.
4-2.1 CUTOUT
Since the MD-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 4-1.
Before actually cutting the panel, be sure that the required
3-dimensional clearances for the relay chassis allow
mounting in the desired location. MD-3000 Protective
Relay dimensions are shown in Figure 5-2. It is necessary
to hold the tolerances shown when making 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).
4-2.2 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 MD-3000 Protective Relay through the cutout in
the panel. Be sure the Operator Panel faces outward. Use
the 0.38 in. (0.9 cm) long screws included with the relay to
mount the unit on a single-thickness panel.
Be sure to start the screws from INSIDE the panel, so they
go through the metal first.
WARNING
