6
Instruction Booklet
IL70C1080H03
Effective May 2014
Instructions for Field Installing Ground Fault Alarm/Power
Supply Modules into Digitrip 520M Equipped Eaton
Magnum and Magnum DS Circuit Breakers
EATON www.eaton.com
9.0 Reassembly
9.1 Replacing the Trip Deck (Mounting Plate)
Swing the steel trip unit mounting plate down onto the two lower
partially loosened attachment screws. Tuck all wiring bundles
neatly behind it so as not to capture wires between the module
and the steel deck. Position the mounting tabs of the Trip Indicator
Assembly (also the Overcurrent Trip Switch / Bell Alarm if this option
is attached) behind the steel Trip Unit Mounting Plate (see Figure 8).
Figure 8. Proper Seating of Trip Indicator Assembly Behind the
Steel Trip Unit Mounting Deck.
Confirm that the steel wireform for the Trip Indicator Assembly is not
bound nor its operation interfered with (see Figure 9). Replace the
two top screws that hold the steel Trip Unit Mounting Plate in place.
Tighten all four appropriately and confirm that the trip deck plate is
firmly seated.
Figure 9. The Steel Wireform of the Trip Indicator Assembly.
9.2 Reinstalling the Trip Unit
Align the Digitrip unit with the two guide pins on the plate and
spring clip of the Magnum Circuit Breaker (see previous Figure 5).
Press the unit into the breaker until the pins engage into the connec-
tors and the lower spring clip engages over the Digitrip’s housing.
WARNING
DO NOT ENERGIZE THE MAGNUM BREAKER WITH THE DIGITRIP REMOVED
OR DISCONNECTED FROM ITS CONNECTOR. DAMAGE TO INTERNAL
CURRENT TRANSFORMERS MAY OCCUR DUE TO AN OPEN CIRCUIT
CONDITION.
9.3 Reinserting and Securing the Rating Plug
If the rating plug was removed from the trip unit, carefully, insert
it back into the cavity on the right-hand side of the trip unit. Align
the three pins on the plug with the sockets in the cavity. The plug
should fit with a slight insertion force.
Now (or If the rating plug was left inside the trip unit), use a 0.125”
(3.2 mm) wide screwdriver to tighten the M4 screw until the screw
head contacts the rating plug with 1 in.-lb (1.36 N·m) of torque.
This will secure the plug and the trip unit into the circuit breaker (as
removed in previous Figure 4).
Close the rating plug door.
CAUTION
DO NOT FORCE THE RATING PLUG INTO THE CAVITY. FURTHERMORE, THE
M4 SCREW SHOULD BE TIGHTENED ONLY UNTIL IT IS SNUG. DO NOT USE
A LARGE SCREWDRIVER. A 1/8” (3 MM) WIDE SCREWDRIVER BLADE IS
ADEQUATE.
CAUTION
BE SURE TO CHECK THAT THE SENSOR RATING MATCHES THAT PRINTED
ON THE RATING PLUG DOOR. INSTALLING A RATING PLUG THAT
DOES NOT MATCH THE SENSOR RATING CAN PRODUCE SERIOUS MIS-
COORDINATION AND/OR FAILURE OF THE PROTECTION SYSTEM.
IF A RATING PLUG IS NOT INSTALLED IN THE TRIP UNIT, THE UNIT WILL
INITIATE A TRIP WHEN IT IS ENERGIZED BY CONTROL POWER OR BY LINE
CURRENT.
9.4 Final Internal Visual Inspection
Before proceeding any further, do a visual inspection to insure that
none of the breaker’s internal wiring might hamper any mechanical
operation or compromise proper fit of any component. Use any
remaining tie wraps to secure any wires which might be loose.
9.5 Replacing the Front Cover
Partially pull down the charging handle on the front of the breaker.
Slide the breaker cover over the handle and into place on the breaker
frame. Using the 10mm ratchet or driver, tighten all four retaining
bolts in each corner of the cover to 25 to 35 in.-lb (33.90 - 47.45
N·m) of torque. Latch the breaker and reset the red flag on the Trip
Indicator Assembly which protrudes from the front cover above the
Trip Unit. Proceed with the test sequence.
otee:
N
At this time, it is highly recommended that the proper accessory label
be placed in the “Accessories” area of the front cover. Chose the sticker
that matches the Trip Unit Power voltage of the style installed:
24-48 Vdc (#70C1081G01), 120 Vac (#70C1081G02) or
240 Vac (#70C1081G03).
