19
Instruction Leaflet
I. L. 29-886B
Effective August 2011
Instructions for Digitrip RMS 610 Trip Unit
eaton corporation
www.eaton.com
1.
Before starting any test sequence
,
check the Unit Status
(Green LED) in the lower right corner of the Trip Unit (see Figure.
1 and 19) to be sure it is blinking on and off about once each sec-
ond, which indicates that the Trip Unit is functioning normally.
In
the event the Unit Status LED is not blinking, install an Auxiliary
Power Module (APM) (see Figure 11), or if you have already
installed one, check to see that it is connected correctly (see
Section 1 .5) .
2.
If the circuit breaker is carrying current,
check that the cur-
rent is not more than 50% of the Long Delay Current Setting (
I
r
);
because the
Trip Unit will not execute your test instructions
when it senses that the current through the breaker exceeds
the 50% level. If the current through the circuit breaker
increases to a value greater than 50% of the Long Delay
Current Setting,
Ir
, the Trip Unit will automatically abort any
Trip Unit Test that may be in progress. Should an actual
overload or fault condition occur during an in-service, test
sequence, the protection function will override the test func-
tion, and the circuit breaker will trip automatically in accor-
dance with the actual Time-Current settings.
3.
When performing tests on the Long Delay element, be aware
that in addition to the standard protection element, the
Digitrip RMS 610 Trip Unit also has a Long Time Memory
function (LTM)
, which serves to protect load circuits from
the effects of repeated overload conditions (see Note 1 under
Section 3 .3 Long Delay Time Setting) . The action of the
LTM
during primary injection tests and during tests initiated from the
Trip Unit Test Panel under the "TEST AMPS" setting of "6T", will
advance the Long Delay Trip Time if multiple Long Delay Time
tests are performed repeatedly - as one might do in making
single-phase tests on each pole of a breaker in succession, for
example . If there is any question, you may simply wait about
ten (10) minutes after a Long Delay Trip for the
LTM
to reset .
The
LTM
is not active during tests initiated from the Trip Unit Test
Panel under the "TEST AMPS" settings of "1", "2", "3", "8", or "10" .
To reset the LTM immediately:
•
Set the "TEST AMPS" to "1" .
•
Press and release the (Black) "TEST" push-button (timer will be
running in the display window), and then
•
Quickly press and release the "TRIP RESET" push-button
before the Trip Unit operates .
•
Now the
LTM
will be reset .
4.
When performing tests on the Ground Fault element, be
aware that in addition to the standard protection, the
Digitrip RMS 610 Trip Unit also has a Ground Time Memory
function (GTM)
, which serves to protect load circuits from the
effects of repeated (sputtering) ground arcs (see Note under
Section 3 .9 Ground Fault Time Delay Setting) . Because the
GTM
resets quickly, it will not normally affect ground fault test results,
but if Ground Fault tests are repeated quickly, the
GTM
can
make the breaker appear to trip too soon .
otee:
N
To STOP a TEST initiated via the integral test panel PRESS and
RELEASE the "TRIP RESET" push-button .
4.4.1 Not Tripping the Breaker
1 . Place the "TEST AMPS" selector switch (see Figure 19) in one of
the six "No Trip" test settings, i .e ., 1, 2, 3, 8, or 10 x I
n
, or GF .
2 . Press and release the (Black) "TEST push-button - the test starts
when the push-button is released, and the
elapsed time will
be displayed
in the window . When the timer stops, the lighted
"RED" cause of trip LED indicates the protection function which
operated .
3 . Should any of the various protection settings be less than the
selected "No Trip" test value, then the LED related to that func-
tion will turn on signifying successful completion of the test
action .
otee:
N
During the long delay tests the Long Delay LED flashes "RED" .
4 . Reset the Trip Unit by pressing and releasing the "TRIP RESET"
push-button; all LEDs lighted by the "No Trip" test action should
turn "OFF, and the display will again show the value of the cur-
rent through the breaker . In the event that no one resets the Trip
Unit after a test, it will wait for about three (3) hours, and then it
will automatically revert back to its pretest status .
4.4.2 Tripping the Breaker
WARNING
CIRCUIT BREAKER OPERATING MECHANISMS OPEN AND CLOSE THE MOVING
PARTS VERY FAST, AND WITH VERY HIGH ENERGY. TOUCHING THE MOVING PARTS
DURING TEST OPERATIONS CAN CAUSE INJURY. KEEP CLOTHING, HANDS, FEET,
AND OTHER PARTS OF YOUR BODY WELL AWAY FROM ALL MOVING PARTS DURING
TESTING. FOLLOW THE INSTRUCTIONS GIVEN FOR TESTING YOUR SPECIFIC TYPE
OF CIRCUIT BREAKER, FOUND IN THE APPROPRIATE INSTRUCTION LEAFLET LISTED
IN SECTION 5.
1 . Make sure that the circuit breaker is carrying no current (see
CAUTION notes under Section 4 .1) .
otee:
N
In the event it is decided to perform a "Breaker Trip Test" while load cur-
rent is flowing, make sure the circuit breaker is carrying no more than 50% of
the Long Delay Current Setting
I
r
. The Trip Unit will NOT execute your instruc-
tions to Test itself, when the load current exceeds 50% of
I
r
.
2 . Place the "TEST AMPS" selector switch (see Figure 19) in either
the "6T (or "GFT) position .
3 . Press and release the (Black) "TEST" push-button (see Figure 19) -
the test starts when the push-button is released and the elapsed
time is displayed in the window .
4 . At least one of the various protection settings will be less than
"6x I
n
", and the circuit breaker will trip, the LED related to that
function will light "RED", and the reason for TRIP code will appear
in the display window (see Table 3 for Code meanings) . If the
"STEP" push-button is pressed and released at this point, the
"TEST" current value will be shown in the display window, not the
actual current flowing in the breaker .
5 . Reset the Trip Unit by pressing and releasing the "Trip Reset"
push-button (see Figure 19) . All LEDs lighted by the "Trip" test
action should turn "OFF, and the display window will again show
the value of current flowing in the breaker .
