Application Guide

System Application Guide SAG586505000
Spec. No. 586505000 (Model LMS1000) SAG586505500
Spec. No. 586505500 (Model LMS1000) Issue AZ, April 7, 2014
Page 39 of 62
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intervals until all controlled rectifiers/PCUs are operating. This prevents commercial
AC power surges which could cause an overload condition possible when several
rectifiers/PCUs are started simultaneously. The standby sequencing option prevents similar
surges when rectifiers/PCUs are powered from a backup AC source, such as an engine-
alternator, after a failure occurs in the commercial AC source. These surges could stall or
overload the standby equipment. LMS1000 senses when the commercial AC input fails and
immediately turns off all controlled rectifiers/PCUs. It waits a programmed time interval and,
when it senses that the standby equipment is operating properly, then sequences the
rectifiers/PCUs on at 15 second intervals until all controlled rectifiers/PCUs are operating.
When AC input power resumes, commercial AC sequencing as described above occurs. Once
all controlled rectifiers/PCUs are restarted, energy management (if supplied) will resume.
Rectifier/PCU sequencing has priority over energy management. Both types of sequencing
use binary input changes to initiate the sequencer.
The sequencer can also be configured with a Sequencer Failsafe Timer feature. This feature
aborts sequencer operation when an external monitoring device controlling sequencer
operation fails. The timer starts when LMS1000 detects an AC failure. If the timer expires
before a signal is received, indicating that the commercial AC is restored or load was
transferred to the standby power source, the following occur: The sequencer is disabled, an
entry is made in the event log, the sequencer variables are reset, and all rectifiers/PCUs are
turned on. If a signal is received before the timer expires, the timer is deactivated and reset.
When the sequencer is disabled, the Set Sequence command must be re-issued to re-activate
the sequencer.
Note: Setting the Sequencer Failsafe Timer to zero (0) disables this feature.
The sequencer can also be configured with an AC Restoration Qualification Timer feature.
This feature is only available when the INPUT TYPE attribute of the sequencer is configured as
a FAIL type, and not as a TRANSFER type. This feature allows the sequencer to turn all
rectifiers/PCUs off and start the sequence re-start operation at a specific time interval from
when commercial AC is restored. The timer starts when a signal is received indicating that the
commercial AC is restored. The standby sequencer (if configured) operates normally until the
timer expires. When the timer expires, all rectifiers/PCUs are turned off and the AC sequencer
starts. If AC fails before the timer expires, the timer is deactivated.
Note: The AC Restoration Qualification Timer feature should be set to a few seconds less
than the actual amount of time required for a proper transfer.
Note: Setting the AC Restoration Qualification Timer to zero (0) disables this feature.
1.5.5 TL1/X.25 Software Option (if installed): LMS1000 can operate as a Network Element (NE)
in a Network Maintenance and Administration (NMA) system. An NMA is an Operations
System (OS) developed by Bell Communications Research (Bellcore).
This software option provides support to the specific TL1 commands and messages listed in
the Commands Chapter of the User Instructions (Section 5847). This option also provides an
asynchronous RS-232 port connection. The port is designed to provide an interface to a
network device which converts the asynchronous output to X.25 packets. The packets can
then be sent out across the network to an operations center or user console.
The terms Access Identifier, LMS1000 Access Identifier, and LMS1000 Sub-Access Identifier
are described as follows.
Access Identifier: In a Network Maintenance and Administration (NMA) system, a unique
access identifier (AID) is used to identify each entity contained within the system. LMS1000
must be configured to allow a single access identifier to be used to access and report on an
NMA system entity which may consist of a multiple of sub-entities, each monitored by a variety
of LMS1000 channels. This is accomplished by configuring LMS1000 access identifiers and
LMS1000 sub-access identifiers as described next. A list of suggested access identifiers and
sub-access identifiers appears in TA-NWT-001360, Table 4-1.
LMS1000 can be set to use an "AID delimiter". When enabled, the LMS1000 access identifier
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