21
Instruction Leaflet
I. L. 29-889B
Effective June 2011
Instructions for Digitrip RMS 910 Trip Unit
eaton corporation
www.eaton.com
4.4.1 Not Tripping the Breaker
1 . Place the "TEST AMPS" selector switch (see Figure 20) 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 6.
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 20) in either
the "6T (or "GFT) position .
3 . Press and release the (Black) "TEST push-button (see Figure 20) -
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 20) . 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 .
4.5 Testing the Back-up Battery (Inside the Rating Plug)
The battery has no part in the protection function of the Trip Unit .
The battery is provided only to maintain the "RED" LED indication of
the cause of TRIP in the Digitrip RMS 910 Trip Unit, when external
control power to the Power / Relay Module is not available . The
battery is located in the rating plug along with a battery check push-
button and a green battery check LED (see Figure 9) .
4.5.1 Back-up Battery Check
The battery is a long life, lithium photo type unit . The status of the
battery can be checked at any time . Press and hold the "battery
check push-button and observe the "Green" LED as shown in Figure
9 . If the battery check LED does not light "Green", replace the bat-
tery . The condition of the battery has no effect on the protection
function of the Trip Unit . Even with the battery removed, the unit
will still trip the breaker in accordance with its settings . If however,
control power is lost and the battery is dead, the cause of TRIP LED
will not be lighted "RED" .
4.5.2 Replacing the Back-up Battery
The battery can be easily replaced from the front of the Trip Unit by
lowering the hinged cover of the rating plug as shown in
Figure 9 . The battery can then be removed by pulling the battery
tab as shown in Figure 9 . After the battery is replaced (or after an
Auxiliary Power Module is plugged into the Trip Unit), one or more of
the cause of Trip LED'S may be illuminated . It is necessary to press
and release the "TRIP RESET button to turn off any of the LEDs that
may be illuminated . Failure to do so can cause the battery to run
down again . The Trip Unit will then be ready to indicate the next
cause of trip .
otee:
N
The battery can be replaced at any time, even while the circuit breaker
is in service, without affecting the operation of the circuit breaker or its pro-
tection function .
CAUTION
CARE SHOULD BE EXERCISED WHEN REPLACING THE BATTERY TO INSURE
THAT THE CORRECT POLARITY IS OBSERVED. POLARITY MARKINGS ARE
VISIBLE ON THE RATING PLUG WHEN THE HINGED COVER IS OPEN AS
INDICATED IN FIGURE 9. IF THE BATTERY IS INSERTED WITH INCORRECT
POLARITY, AND IF THE 120 VAC CONTROL POWER TO THE POWER RELAY
MODULE IS LOST, THEN, AFTER AN OVER CURRENT OR SHORT-CIRCUIT
TRIP, NO LEDS WILL BE LIGHTED RED TO INDICATE THE REASON FOR THE
TRIP.
The replacement battery should be the same type or equivalent .
Acceptable 3 .0 volt lithium batteries may be obtained as type desig-
nation CR 1/3N or DL 1/3N .
