6-5.2 Current Sensor Replacement - Eaton MDN-408 Instructions For Installation, Operation And Maintenance

Instruction Book
Page 65 Effective: May 2006
To install a new rating plug, insert the rating plug into
the cavity where the other rating plug was removed.
Make sure the three pins on the rating plug are aligned
with the sockets in the cavity. The rating plug should fit
with a slight insertion force.
!
CAUTION
TO PREVENT DAMAGE TO THE RATING PLUG, DO
NOT FORCE IT INTO THE MOUNTING CAVITY.
Use the same 1/8" screwdriver to tighten the M4 screw
and secure the rating plug in the trip unit. The maxi-
mum torque on the mounting screw is 15 in-oz. Close
the rating plug door.

6-5.2 CURRENT SENSOR REPLACEMENT

NOTICE
Remember that the trip unit's rating plug and the
circuit breaker's current sensors must have match-
ing ratings.
The three current sensors are installed at the rear of the
circuit breaker on the lower terminals. A cover with sen-
sor rating viewing windows covers the sensors and is
held in place with screws (Figure 6-7). Remove the
cover by removing the screws.
Figure 6-7 Current Sensor Cover in Place Over
Sensors
Current Sensor
Cover
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If the circuit breaker is a drawout configuration, the
lower primary disconnect finger clusters and the vertical
adaptors must first be removed from frame sizes up to
3000/3200A. On the 3000/3200A frame, both the upper
and lower primary disconnects and vertical adaptors
must be removed. Each primary disconnect finger clus-
ter is removed by loosening the two hex-head bolts with
a 10 mm wrench. These bolts do not have to be com-
pletely removed to slide the primary disconnects off of
the terminals. Remove the vertical adaptors next from
the circuit breaker terminals by removing the two or
three 10 mm bolts holding them in place (Figure 6-8).
The current sensors are removed by pulling them off of
the terminals and unplugging the wiring plugs from the
sensors (Figure 6-8).
Install new current sensors by connecting the wiring
plugs to the sensors and sliding the sensors over the
terminals. Reinstall the cover over the sensors and
secure in place with the screws previously removed.
Reinstall the previously removed vertical adaptors to the
terminals using the removed hardware and 40 ft-lb of
tightening torque. Make sure the vertical adaptors are
square to the rear housing. Slip the primary discon-
nects on to the vertical adaptors. Make sure the primary
disconnects are fully inserted on to the vertical adaptors.
Tighten the two retention bolts to 40 in-oz of torque.
Properly engaged and secured retention bolts should
engage the slots or holes in the vertical adaptors.
Wiring Plug
Figure 6-8 One Current Sensor Shown Removed and
Disconnected
Vertical
Adaptor
Current
Sensor
I.B. 2C12060H08