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10
en | System overview
3
System overview
The Loudspeakers Line Isolator System is the cost‑efficient solution for preventing loss of
audio function in public address and voice alarm systems as a result of loudspeaker line faults.
It largely eliminates the need for expensive E30 cabling by making use of the so‑called loop
wiring method. The system is fully supervised and is perfectly suited for use in commercial
premises, such as office buildings and hotels.
Typical applications include:
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The Loudspeakers Line Isolator System consists of the following products:
PM1‑LISM6 - Loudspeaker Line Isolator System Master
Referred to in this manual as Master Unit:
The Master Unit is the main component of the Loudspeakers Line Isolator System. The zone
outputs of the public address/voice alarm system are connected to the Master Unit. Each
Master Unit has connections for six loudspeaker loops. Each loudspeaker loop can manage
500 watts. A maximum of 50 Isolator Boards can be installed in each loudspeaker loop.
The front panel on the Master Unit has LEDs to indicate:
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All fault indicators on the front panel are linked to fault relays on the rear panel.
PM1‑LISS - Loudspeaker Line Isolator with Housing
Referred to in this manual as Isolator Board:
The Isolator Board has two 100 volt audio connectors for connecting to both sides of the
loudspeaker loop and a third 100 volt audio connector for creating a tap-off for one or more
loudspeakers. Jumper settings are provided to set the permissible loudspeaker power level
(10, 36, 100 watt, or 10 watt with 20 kHz pilot tone filter), and other supervision settings.
2014.03 | V1.1 |
Public address systems that cover large zones: more than 25 loudspeakers per zone.
Voice alarm: locations that have several rooms in the same fire zone.
The status of each loop.
The status of the mains and back-up battery power supplies.
Installation and Operation Manual
Loudspeakers Line Isolator System
Bosch Security Systems B.V.
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