Cutler-Hammer Digitrip OPTIM 550 Руководство по установке - Страница 2
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The Digitrip OPTIM 550 Trip Unit is completely self con-
tained and when the circuit breaker is closed, requires
no external power to operate its protection systems. It
operates from current signal levels and control power
derived through current sensors integrally mounted in
the trip unit.
Digitrip OPTIM 550 Trip Units are suitable for 50/60 Hz
AC applications only. For DC applications, a thermal-
magnetic trip unit should be used.
The Digitrip OPTIM 550 Trip Unit for the L-Frame is
available in 3 different types and four different maximum
ampere ratings (Table 1.1).
Table 1.1 Digitrip OPTIM 550 Trip Unit Types
Catalog Number
Max Amps
LEP3125T52
125A
LEP3125T56
125A
LEP3125T57
125A
LEP3250T52
250A
LEP3250T56
250A
LEP3250T57
250A
LEP3400T52
400A
LEP3400T56
400A
LEP3400T57
400A
LEP3600T52
600A
LEP3600T56
600A
LEP3600T57
600A
Ground Fault Alarm trip units do NOT provide ground fault protection.
2.0 UL LISTED DEVICES
The Digitrip OPTIM 550 Trip Unit is listed in accordance
with Underwriters Laboratories, Inc. Standard UL489,
under file E7819 and satisfies the applicable require-
ments of the International Electrotechnical Commission
(IEC) recommendations for molded case circuit break-
ers.
3.0 INSTALLATION
The installation procedure consists of inspecting and
installing the trip unit and rating plug. To install the trip
unit, perform the following steps.
NOTICE
If required, internal accessory installation should be
done before the circuit breaker is mounted and con-
nected. Refer to the individual accessory instruction
leaflets.
Version
Description
LSI
Non-ground Fault
LSIG
Ground Fault
LSIA
Ground Fault Alarm
LSI
Non-ground Fault
LSIG
Ground Fault
LSIA
Ground Fault Alarm
LSI
Non-ground Fault
LSIG
Ground Fault
LSIA
Ground Fault Alarm
LSI
Non-ground Fault
LSIG
Ground Fault
LSIA
Ground Fault Alarm
Make sure that the trip unit is suitable for the intended
installation by comparing nameplate data with any exist-
ing equipment and system requirements. Inspect the trip
unit for completeness, and check for damage before
installing it in the circuit breaker frame.
Remove and SAVE the Jumper plug assembly (a 12
position housing) from the trip unit (see Figure 3-2).
Remove the wire-retaining bracket from the right pole of
the trip unit.
NOTICE
Trip unit center retaining screw is captive in the trip
unit conductor; the remaining retaining screws (2
for a 3-pole trip unit) are supplied with the frame.
Remove circuit breaker pan-head cover screws, and
covers. Remove trip unit outer pole screws and red
plastic washers from the frame. Discard red plastic
washers (Figure 3-1).
NOTICE
The two trip unit outer pole retaining screws may be
placed in the trip unit conductor holes at this time. If
preferred, a 5/16 inch hexagonal-head wrench may
be used to position the screws when the trip unit is
in the base.
Figure 3-1 Preliminary Preparation
I.L. 29C508B
Remove and Dispose
of Red Spacers
Effective 9/00