• Minimum/Maximum magnitudes all monitored currents
Automatic Trip Condition
When a system condition results in an automatic trip,
the OPTIM Trip Unit monitors and stores in non-volatile
memory the reason for the trip and all of the following:
• Magnitude phase A, B and C trip currents
• Magnitude ground trip current
• Magnitude neutral trip current
3-3.3 REMOTE SIGNAL CONTACTS
Series C R-Frame, SPB Pow-R and DSII/DSLII
Contacts (Models 750 and 1050)
A power relay module, described in paragraph 2-7.2, is
mounted internally to Series C R-Frame, SPB Pow-R
and DSII/DSLII circuit breakers to provide control power
and relay contacts for remote signaling.
Series C K, L and N-Frame Contacts
The Series C L and N-Frame breakers provide alarm
contacts by either of two options:
• A remotely mounted ground fault indicator module
may be hard wired directly to the breaker with Models
750 and 1050. This ground fault indicator module pro-
vides dedicated alarming contacts for ground fault
conditions only. Refer to Table
2.2
for contact ratings
and Table
A.1
of Appendix A for the appropriate
wiring diagrams.
• The remotely mounted Breaker Interface Module
(BIM) has contacts that can be configured to operate
under specific conditions. The signaling of the appro-
priate contact operation is done via an IMPACC com-
munications link between the breaker and the Breaker
Interface Module. Refer to the Breaker Interface
Module instruction book (I.B. 29C893) for specifics on
the programming and ratings of these contacts.
UNEXPECTED SIGNALS TO CLOSE OR TRIP A CIR-
CUIT BREAKER FROM A REMOTE LOCATION VIA
THE COMMUNICATIONS NETWORK CAN CAUSE
PERSONAL INJURY TO PERSONNEL WORKING IN
THE IMMEDIATE VICINITY OF THE CIRCUIT BREAK-
ER. PERMISSIVE CONTROL SWITCHES OR OTHER
MEANS SHOULD BE PROVIDED LOCALLY AT THE
I.B. 29C891B
Page 34
Effective 11/98
WARNING
metered parameters are monitored and then displayed
over the OPTIM information system. Local LEDs are used
to indicate a number of conditions and/or operations. The
LEDs are complemented by
trip event information
stored in non-volatile memory.
Information can be
accessed via the OPTIMizer Hand Held Programmer,
Breaker Interface Module, or over the IMPACC System.
System monitoring encompasses the following three
broad categories:
• Load Current Monitoring
• Power and Energy Monitoring
• Power Quality Monitoring
Refer to Tables
3.2
and
3.3
for a general overview of
the features included in system monitoring. The expect-
ed accuracies associated with displayed parameters are
also summarized in Tables
3.2
and
3.3
.
3-3.1 DISPLAYS AND LED INDICATORS
All information in the trip unit may be accessed by using
one or more of the following devices:
• OPTIMizer Hand Held Programmer (I.B. 29C892)
• Breaker Interface Module (I.B. 29C893)
• Remote Computer via IMPACC (I.B. 29C890)
For detailed information on the use of a specific device,
refer to the instruction book (IB) reference indicated next
to the particular display device.
The trip unit’s information system utilizes front mounted
LEDs to indicate a number of trip unit functions, such as
mode of trip. Refer to paragraphs 2-4.1 (K, L and N-
Frame type trip units) and 2-5.1 (R-Frame, SPB and
DSII/DSLII type trip units) for detailed information on the
LEDs provided.
3-3.2 NORMAL SERVICE/AUTOMATIC TRIP
CURRENT MONITORING
Digitrip OPTIM Trip Units monitor a variety of currents for
both normal service and automatic trip conditions. The
value of currents are displayed in amperes by one of the
devices outlined in paragraph 3-3.1.
Normal Service Condition
During normal service conditions with the circuit breaker
closed, the OPTIM Trip Unit monitors all of the following:
• Present magnitude phase A, B and C currents
• Present magnitude ground current or present magni-
tude neutral current
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