Lib-200A; Lib-400; New Lib Features - Notifier AM2020 User Manual

The LIB-200A field wiring is electrically isolated from the rest of the system so that any two ground faults on
separate SLCs will not cause invalid replays from devices. A short to any other system circuit will not cause
communication loss. The LIB-200A has an earth ground fault detection circuit with selectable high/low
sensitivity and disable. Use only the high sensitivity setting as shipped from the factory. Port A and Port B of
the LIB 200A can each support up to 12,500 feet (3,810 meters) of SLC wiring for Style 4. For Styles 6 and 7,
Port A and Port B together will support 12,500 feet (3,810 meters) SLC wiring in total. The maximum loop
resistance for style 4 is 50 ohms on ports A and B and 50 ohms total for Styles 6 and 7. The LIB-200A
supports the Local Mode General Alarm Bus, a feature which permits limited alarm function in the unlikely
event of a CPU failure. The LIB-200A has two LEDs; yellow displays earth ground fault trouble and red
indicates initiated alarm condition during local mode only (refer to Figure 4.2-2).
If wiring for the LIB-200A leaves the building, one or more surge suppressors are required. Refer to the Surge
Supression portion of this section for information on surge suppressors that are approved for use with this FACP.
The LIB-400 field wiring is electrically isolated from the rest of the system so that any two ground faults on
separate SLCs will not cause invalid replays from devices. A short on to any other system circuit will not
cause communication loss. The LIB-400 has an earth ground fault detection circuit with selectable high/low
sensitivity and disable. Use only the high sensitivity setting as shipped from the factory. Port A and Port B of
the LIB 400 can each support up to 12,500 feet (3,810 meters) of SLC wiring for Style 4. For Styles 6 and 7,
Port A and Port B together will support 12,500 feet (3,810 meters) SLC wiring in total. The maximum loop
resistance for Style 4 is 50 ohms on ports A and B and 50 ohms total for Styles 6 and 7. The LIB-400 sup-
ports the Local Mode General Alarm Bus, a feature which permits limited alarm function in the unlikely event
of a CPU failure. The LIB-400 has two LEDs per loop; yellow indicates an earth ground fault and red indicates
an alarm condition during local mode only (refer to Figure 4.2-2).
If wiring for the LIB-400 leaves the building, one or more surge suppressors are required. Refer to the Surge
Supression portion of this section for information on surge suppressors that are approved for use with this FACP.
The following features are only present on the LIB-200A and the LIB-400:
• A Noise Control Module (NCM-1) is built in to reduce common mode noise on the SLC.
• Local Mode General Alarm Bus support (during a CPU board failure).
During a CPU failure, if one of the initiating devices programmed to participate in local mode is acti-
vated, the following will occur:
- The LIB will execute local mode,
- which turns on the red alarm LED on the LIB-400 or LIB-200A,
- and signals an alarm state through the general alarm bus (pin 16 of the ICA-4L) to other LIB-400/200As.
- The LIB is capable of sensing the general alarm bus, and therefore will execute its own local mode
action.
- Reduced RF Emissions
The use of conduit and shielded cable is no longer required for compliance with FCC Part 15
Class A Radiated Emissions Limits. The use of twisted pair cable is recommended to achieve the
maximum wire lengths indicated. The use of shielded cable and/or untwisted cable will reduce the
maximum wiring distance.
Installation 15088: J 10/22/99
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