Effective April, 1999
IL 33-DB6-1
Page 19
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.
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 instructions and the customer’s
safety standards and procedures for racking a
Breaker into the Connected 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
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
