EATON CORPORATION www.eaton.com
19
Instruction Leaflet IL 33-LGH-3
Effective September 2010
Digitrip Retrofit System for the ITE
LG-3000 (Frameless) Circuit Breaker
3.
For 810 and 910 Kits Only. Without any power
applied to the system (neither the 120 volt
power supply nor the Aux. Power Module
connected), plug the External Harness into the
Cell Harness and check the impedance
between COM 1 and COM 2. The impedance
should be between one (1) and three (3) ohms.
If the impedance is not within this range, trace
the wiring and examine each connection to
assure its integrity.
Confirm that the IMPACC communication
wiring is correct by following the procedures
detailed in Section 7.4 of the Instructions for
the Application of Digitrip RMS Retrofit Kits
on Power Circuit Breakers. Note that for 810
and 910 Kits, the impedance between COM 1
and COM 2 should be between one (1) and
three (3) ohms.
When testing is complete, disconnect the
External Harness from the Cell Harness.
Final External Harness connection will be
performed in Step 13.
For Kits Supplied with a Cell Harness Only.
Step 13: Mounting the Cell Harness
A. The Cell Harness is to be mounted in the
Breaker Cell. The connector end is to be
mounted on the right front side of the Cell, in a
location suitable for connection with the
External Harness. The Terminal Blocks can be
mounted anywhere space is available in the
Cell as long as connection to the External
Harness can be made.
B. Route the Cell Harness wiring to keep it away
from any moveable parts within the Cell
Housing.
Step 14: Installing the Retrofitted Breaker in
the Cell
Do not leave the Breaker in an intermediate
position in the switchgear cell. Always leave
it in the CONNECTED, DISCONNECTED, or
(Optional) TEST position. Failure to do so
could lead to improper positioning of the
Breaker and flashover, causing death, serious
personal injury, and / or property damage.
NOTE:
It is the responsibility of the Retrofitter to
insure proper Breaker / Cell fit. When racking the
Breaker into the Connected position, the Retrofitter
MUST FOLLOW BOTH the manufacturer’s instruc-
tions and the customer’s safety standards and
procedures for racking a Breaker into the Con-
nected position.
A. With the Breaker in the Open position and the
springs discharged, slowly rack the Breaker into
the Connected position, making sure there is no
interference or binding. The Breaker should
rack smoothly and without mechanical
interference between any Breaker and Cell
parts. The Retrofitter will feel some resistance
when the primary fingers connect onto the
stabs of the Cell. This is normal.
However, if any unusual resistance is detected
that could be abnormal interference between
the Breaker and Cell parts, stop immediately
and move the Breaker out of the Connected
position. Examine what is causing the
interference and correct the situation.
WARNING
