13
Instruction Leaflet
I. L. 29-886B
Effective August 2011
Instructions for Digitrip RMS 610 Trip Unit
eaton corporation
www.eaton.com
CAUTION
BEFORE YOU FIT THE RATING PLUG INTO THE TRIP UNIT, BE SURE TO CHECK THAT
THE BREAKER TYPE AND FRAME RATING (OR SENSOR RATING IF APPLICABLE),
MATCH THOSE PRINTED ON THE RATING PLUG COVER. INSTALLING A RATING PLUG
THAT DOES NOT MATCH THE BREAKER TYPE AND FRAME RATING (OR SENSOR
RATING, IF APPLICABLE), CAN PRODUCE SERIOUS MIS-COORDINATION AND/OR
FAILURE OF THE PROTECTION SYSTEM.
After installing the Rating Plug, press and release the "TRIP RESET"
push-button to turn off any illuminated LEDs . The purpose of the
rating plug is to set the value of I
n
, the basis for the Trip Unit protec-
tion function current settings (see Section 3 for details) . Each circuit
breaker frame rating represents the maximum current it can carry
continuously . However for proper coordination of over-current pro-
tection, it is often desirable to choose different levels of I
n
for differ-
ent circuit breakers of the same frame rating . An assortment of rat-
ing plugs with different I
n
values is available for each breaker frame
rating (see circuit breaker instruction leaflet supplements listed in
Section 5) to give the user flexibility to change the value of I
n
with-
out having to change the primary current sensors on the breaker .
By changing the rating plug, the User can easily change the range
of current protection settings without having to remove the circuit
breaker from its enclosure .
For example, if one expects a circuit to carry 600 A initially, but then
increase to 1400 A in the future, one could initially install
1600 A cables and a 1600 A breaker frame with the Trip Unit rating
plug whose I
n
= 800 A . Then later on when the additional load is
ready to come on line, the rating plug could be exchanged for one
with I
n
= 1600 A, without having to remove the breaker from its
enclosure . The available settings would give the following choices:
Long Delay Setting
I
r
= I
n
x: .5 .6 .7 .8 .85 .9 .95 1 .0
Plug I
n
=800 A
LDPU I
r
= : 400 480 560 640 680 720 760 800 A
Plug I
n
= 1600 A
LDPU I
r
= : 800 960 1120 1280 1360 1440 1520 1600 A
otee:
N
Rating plugs from Digitrip models 500 / 600 / 700 / 800 CANNOT be
used with model 610 Trip Units . The connection pins are located in different
positions, so one cannot accidentally use the incorrect type of plug .
Rating Plugs for the Digitrip RMS 610 Trip Units are marked for, and
may be applied on both 50 and 60 Hz systems .
Rating plugs have two current ratings listed on their covers (see
Figure 9) .
•
The "Must Use With Frame Rated" current value (or "Sensor
Rated", if applicable),
and
•
" I
n
(rated I)=" current value .
This latter value (I
n
) is the basis for the Trip Unit current settings:
•
The instantaneous and Ground Current Settings (if applicable) are
multiples of (I
n
) (see Sections 3 .6 and 3 .8 .) .
•
The Long Delay Current Setting,
I
r
is a multiple of (I
n
) . Long
Delay Current Setting =
I
r
= LD x (I
n
) (see Section 3 .2 .) .
•
The Short Delay Current Setting (if provided) is a multiple of
I
r
which in turn is a multiple of (I
n
) . Short Delay Current Setting =
SD x
I
r
= SD x LD x (I
n
) (see Section 3 .4) .
If the rating plug is missing or not well connected, then the display
will show "PLUG" and the instantaneous / override LED will be
lighted . If the circuit breaker is closed, it will trip; if it is open, it will
remain trip-free, as long as 120 Vac control power is available to the
Power / Relay Module . Even if control power is lost, and the rating
plug condition is not corrected, as soon as the three-phase current
through the circuit breaker reaches 20% (40% if single-phase cur-
rent) of the frame / current sensor rating, the Trip Unit will trip the
breaker again .
As indicated in Figures 2 and 9, a back-up battery is provided to
maintain the mode of trip LED indication in the Digitrip RMS 610 Trip
Unit when external control power to the Power / Relay module is not
available . The back-up battery is located in the rating plug along with
a battery check push-button and a green battery check LED . The bat-
tery in the rating plug is "OK" if the LED lights "Green" when the "bat-
tery check" button next to it is pushed (see Section 4 .5) .
otee:
N
The battery is used only to maintain the cause of TRIP LED indication .
It has NO part in the PROTECTION FUNCTION of the Trip Unit, and, it does
NOT light the display window .
