The Power/Relay module will maintain the cause of trip
LEDs history and trip history as long as the control power
supply is available. With loss of the control power supply,
only the cause of trip LEDs will be maintained by the
back-up battery located in the rating plug.
The High-Load message and remote alarm switch are
pre-set at 85% of the value of the long delay setting. The
High-Load relay operates and the LED turns
"
ON ” when
the 85% level is exceeded only after an approximate 40
second delay to ride through momentary High-Load con-
ditions.
4.4 Digitrip RMS 810
The Digitrip RMS 810 Trip Assembly is similar to the Dig-
itrip RMS 610 Trip Assembly with the addition of a four-
digit display, three-phase (
I
, I
B
, I
C
) and one ground cur-
rent (l
G
) or one neutral current (l
), green pointer LEDs
along with a stepping push button, peak demand, present
demand and energy consumed green pointer LEDs along
with a peak demand reset push button as illustrated in
Table 1. The Digitrip RMS 810 Trip Unit is described in
l.L. 29-888.
The Trip Assembly provides for both local displays on the
face of the trip unit and remote communications via an
IMPACC communication network signal link as illustrated
in Table 1.
In addition, if desired, an Assemblies Electronic Monitor
(AEM) as described in l.L. 17-216, may also be installed
to show the parameters in Table 1 covered under Note 2.
A communicating panel mounted device, the Breaker
Interface Module (BIM), as described in l.L. 29C893 can
be used to display metering and other transmittable data.
Interconnections for the IMPACC circuit must be con-
nected as shown in l.L. 29-888 and wiring diagram using
twisted pair (shielded) No. 18 AWG conductors.
The three-digit IMPACC address must be set on each trip
unit per instructions given in l.L. 29-888. To insure that
each circuit breaker in an assembly is properly located
after the address is set, the breaker should be identified
with its proper cell location and that reference along with
the breaker IMPACC address marked on the face of the
trip unit in the spaces provided.
In addition to the communication of the breaker data, the
IMPACC module allows for remote tripping (via the flux
shunt trip) and closing of the circuit breaker.
4.5 Digitrip RMS 910
The Digitrip RMS 910 Trip Assembly is similar to the Dig-
itrip RMS 810. It is a communicating trip unit that pro-
vides all the functions described in Section 4.4 plus the
addition of the following features both locally displayed
and remotely communicated:
1.
Phase-to-phase voltages -
V
,
V
BC
, V
CA
2.
System power factor - PF
3.
Total harmonic distortion THD for I
,
I
B
, I
C
The THD calculation also includes the individual har-
monic currents up to the 27 harmonic as a percentage of
the fundamental. Also included with the THD is provi-
sions for waveform capture information via a host com-
puter. Detailed information is provided in l.L. 29-889.
4.6 Digitrip OPTIM 750
The Digitrip OPTIM 750 is a programmable communicat-
ing microprocessor-based RMS current sensing trip unit.
For the R-Frame breaker it is physically the same plug-in
trip unit as all the other Digitrip models. There are two
style offerings – Phase Protection with Ground Fault Trip
(Cat. P76LSIG) and Phase Protection with Ground Fault
Alarm (Cat. P77LSIA).
The front panel of the unit has 3 or 4 causes of trip LEDs
and a telephone type receptacle for purposes of pro-
gramming settings, testing and displaying phase currents
via a separate hand-held unit called the OPTIMizer.
There are up to 10 trip functions that can be programmed
which includes both a 1
2
t
and 1
4
t curve for the Long-Time
slope. There are also typically ten times the number of
setpoints compared to a front adjustable trip unit. All
transmittable data as well as programming of the trip
curve settings can also be communicated over a twisted
pair cable via the breaker
'
s secondaries (terminals C11,
C12) to either a host computer or a panel mounted
Breaker Interface Module (BIM).
The breaker includes a Power/Relay module per Fig. 5 to
provide power for the communications function and delay
output for alarming.
Detail information on Digitrip OPTIM trip units is in
l.L. 29C891.
4.7 Digitrip OPTIM 1050
The Digitrip OPTIM 1050 is a programmable communi-
cating microprocessor-based RMS current sensing trip
unit. For the R-Frame breaker it is physically the same
Effective Date October 2010
Instruction Leaflet 29C713E
Effective October 2010
EATON CORPORATION www.eaton.com
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