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Product Application: SLS & TLS
Typical Application Examples From The Field
A
bolt of lightning follows two simple laws:
1. The Law of Physics:
The path of
least resistance as electrical energy travels to earth ground.
2.
The Law of Murphy:
If something
bad might happen, it will.
Put
the two together and you get the reason why Grommes~Precision created the SLS
Speaker Line and TLS Tel-Page Line Lighting Suppressors.
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Because
the SLS and TLS involve one of the more powerful forces of nature, it is important
to understand what exactly these little units prevent and what they cannot
prevent.
Lightning
damage to electronic equipment can be broken down into two categories: (1) a
direct strike, and (2) an indirect strike. As it turns out, direct strikes are
actually quite rare in the industry as equipment, with the exception of outdoor
speakers and speaker/telephone lines, is generally kept indoors. And since an
average lightning bolt contains 1 billion volts and between 10,000 to 200,000
amperes of current, that's good news for both the owners of the electronic
equipment who must pay to repair or replace and sound contractors who have to
come in, disconnect, and substitute the fried equipment.
Much more likely, however, is the indirect, or induced strike. With the
induced strike, lightning does not strike the electronic equipment or
speaker/telephone line directly, rather, it propels, or induces large voltages
of electrical energy into the system, thus frying the equipment. The electric energy is propelled into the surrounding nearby
area, thus, surging it's way down nearby speaker/telephone lines on its way
toward reaching earth ground and equilibrium (the connected electronic
equipment). Unfortunately, it is at this very point that Murphy's Law meets the
Law of Physics, for it is undoubtedly your speaker/Tel-Page line that is
induced, and your electronic equipment left smoking in the corner of the
room.
Since
the induced strike is so much more likely, Grommes~Precision created the SLS and
TLS. Both units are simple to integrate into a new or existing system and will
provide peace of mind should lightning be induced into the system.
Below
are some typical applications illustrating how best to maximize the
protectiveness of the SLS and TLS.
Products Illustrated In The Application Examples Below
1. SLS: Speaker
Line-Lightning Suppressor
Designed to prevent speaker line lightning
surges from harming electronic equipment connected to it. Simply
locate the SLS within the speaker line directly after the electronic
equipment to protect the equipment, or directly before the speaker to
protect that speaker or speaker cluster.
2. CV-600: 25V, 70V, or 100V Speaker Line to 600 OHM or LINE Converter
An accessory designed to isolate and convert balanced or
unbalanced speaker line level (25V, 70V, or 100V) voltage into a usable 600 OHM
or LINE signal that can feed an additional amplifier.
3. TLS: Tel-Page
Line-Lightning Suppressor
Designed to prevent
Tel-Page line lightning
surges from harming electronic equipment connected to it. Simply
locate the TLS within the Tel-Page line directly before the electronic
equipment to protect the equipment. NOTE: The TLS is NOT meant to protect
the phone system as it is not designed to pass ringer voltage (REN = Z).
4. IT-600: 600 TO
ISOLATED 600
OHM TRANSFORMER
An accessory designed to isolate and convert the telephone
line sitting at DC potential so as to make it a usable signal for the amplifier
and other electronic equipment. It also is useful for eliminating oscillation
that can occur from long telephone lines.
Legend For Application Examples
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Legend
for The Application Examples Below |
General Application Example
The following General Application
Example illustrates how the SLS, CV-600, TLS, and IT-600 can be integrated
in a new or existing system.
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FIG-1: General
Application.
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1. Main Building:
A. Before the Electronic Equipment
Connect
the Tel-Page line from the telephone system to the TLS directly before the
electronic equipment to protect
the amplifier and other electronic equipment from an lightning surge if
that Tel-Page line is induced by lightning.
Using
the IT-600, convert the telephone line into a 600 OHM line and
connect to the amplifier, such as an AXIOM
power amplifier which is engineered for
all-in-one telephone paging solutions and includes a balanced, tamper
resistant 600 ohm/Tel-Page input. The IT-600 serves a couple
purposes: 1) it converts the telephone line (typically sitting at DC
potential) into a usable signal that an amplifier can use, and 2) it
eliminates oscillation that can occur in long telephone lines which
produces unwanted noise in the audio signal.
B. At the Electronic Equipment
Connect the other
electronic equipment, such as preamplifiers,
EQ units, tuners,
and interior speakers to the sound
system.
C.
After the Electronic Equipment
Connect the speaker line
that will be running outside of the building to the SLS directly after the
amplifier and other electronic components. Installing the SLS here will
protect the amplifier and other electronic equipment from an lightning
surge if that exterior speaker line is induced by lightning.
2. Connecting the Outdoor Remote Speaker Horn or
Speaker Cluster:
Connect the outdoor speaker line to the SLS
directly before the speaker or start of the speaker cluster that needs
protection. This will protect that speaker or speaker cluster.
3. Building A: Audio From The Telephone Line:
A. Before the Electronic Equipment
Connect
the telephone line from the telephone system coming in from the outside to
the TLS. Using the IT-600, convert the telephone line into a 600 OHM
line and connect to the amplifier and electronic equipment.
4. Building B: Audio
From The Speaker Line:
A. Before the Electronic
Equipment
Connect the speaker line
coming in from the outside to the CV-600 directly after the amplifier and
other electronic equipment. Installing the CV-600 here will protect
the electronic equipment from a lightning surge if lightning induces that
exterior speaker line running between the Main Building and Building B.
Next, connect the
speaker line from the SLS to the CV-600. The CV-600 can convert either
25V, 70V, or 100V speaker line into either 600 OHM or LINE level so as to
isolate and convert balanced or unbalanced speaker line level voltage into
a usable signal that can feed the additional amplifier.
5.
Connecting the Outdoor Remote Speaker Horn or Speaker Cluster:
Connect the outdoor speaker line to the SLS directly
before the speaker or start of the speaker cluster that needs protection.
This will protect that speaker or speaker cluster.
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Typical Field Applications
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FIG-2: Restaurant/Tavern With
Outdoor Seating.
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1. Restaurant/Tavern:
A. Before the Electronic Equipment
Connect the telephone line from
the telephone system to the TLS directly before the electronic equipment.
Installing the TLS here will protect
the amplifier and other electronic equipment from an lightning surge if
that exterior telephone line is induced by lightning.
Using
the IT-600, convert the telephone line into a 600 OHM line and
connect to the amplifier, such as an AXIOM
power amplifier which is engineered for
all-in-one telephone paging solutions and includes a balanced, tamper
resistant 600 ohm/Tel-Page input. The IT-600 serves a couple
purposes: 1) it converts the telephone line (typically sitting at DC
potential) into a usable signal that an amplifier can use, and 2) it
eliminates oscillation that can occur in long telephone lines which
produces unwanted noise in the audio signal.
B. At the Electronic Equipment
Connect the other
electronic equipment, such as preamplifiers,
EQ units, tuners,
and interior speakers to the sound
system.
C.
After the Electronic Equipment
Connect the speaker line
that will be running outside of the building to the SLS directly after the
amplifier and other electronic components. Installing the SLS here will
protect the amplifier and other electronic equipment from an lightning
surge if that exterior speaker line running the outdoor seating is induced
by lightning.
2. Outdoor Seating
A. Connecting the Outdoor Remote Speaker Horn or
Speaker Cluster
Connect the outdoor
speaker line to the SLS directly before the speaker or start of the
speaker cluster that needs protection. This will protect that speaker or
speaker cluster.
B. NOTE:
The speaker horn directly
outside of the restaurant/tavern in the diagram is an illustration of a
speaker horn that is NOT protected from an induced lightning strike.
Neither the SLS protecting the Outdoor Remote Speaker Horn, nor the SLS
protecting the amplifier and electronic equipment within the
restaurant/tavern will protect this lone speaker horn. To protect this
speaker horn, connect the outdoor speaker line to the SLS directly before
the speaker. Then, and only, then will this speaker be protected from an
induced lightning strike.
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FIG-3: Fairground.
1. Central Office:
A.
After the Electronic Equipment
Connect the speaker line
that will be running outside of the building to the SLS directly after the
amplifier and other electronic components. Installing the SLS here will
protect the amplifier and other electronic equipment from an lightning
surge if that exterior speaker line is induced by lightning.
B. NOTE:
The speaker horn directly
outside of the Central Office in the diagram is an illustration of a
speaker horn that is NOT protected from an induced lightning strike.
Neither of the SLS units protecting the Outdoor Remote Speaker Horns on
the telephone poles, nor the SLS protecting the amplifier and electronic
equipment within the Central Office will protect this lone speaker horn.
To protect this speaker horn, connect the outdoor speaker line to the SLS
directly before the speaker. Then, and only, then will this speaker be
protected from an induced lightning strike.
2. Outdoor Venue
A. Connecting the
Outdoor Remote Speaker Horn or Speaker Cluster
Connect the outdoor speaker line to the SLS
directly before the speaker or start of the speaker cluster that needs
protection. In this diagram, there are two speaker clusters are on two separate
telephone poles and therefore get their own SLS.
3. Building 1:
Audio From The Speaker Line To Additional Amp or MIxer:
A. Before the Electronic
Equipment
Connect the speaker line
coming in from the outside to the CV-600. The CV-600 can
convert either 25V, 50V, or 70V speaker line into either 600 OHM or LINE
level so as to
isolate and convert balanced or unbalanced speaker line level voltage into
a usable signal that can feed the additional amplifier.
Connect the speaker line that will be running outside of the
building to the SLS directly before the amplifier and other electronic
components. Installing the SLS here will protect the amplifier and other
electronic equipment from an lightning surge if that exterior speaker line
running between the Central
Office and Building 1 is induced
by lightning.
B. At the
Electronic Equipment
Connect the other
electronic equipment, such as preamplifiers,
EQ units, tuners,
and interior speakers to the sound
system.
C. After the Electronic Equipment
Connect the speaker line
that will be running outside of the building to the SLS directly after the
amplifier and other electronic components. Installing the SLS here will
protect the amplifier and other electronic equipment from any lightning
surge that may occur if that exterior speaker line running between
Building 1 and Building 2 is induced by lightning.
4. Building 2: Audio From The
Speaker Line To Additional Indoor Speaker or Speaker Cluster
A. Before the Electronic
Equipment
Connect the speaker line coming
in from the outside to the CV-600. The CV-600 can
convert either 25V, 50V, or 70V speaker line into either 600 OHM or LINE level
so as to isolate and
convert balanced or unbalanced speaker line level voltage into a usable signal
that can feed the additional amplifier.
Connect
the speaker line that will be running outside of the building to the SLS
directly before the amplifier and other electronic components. Installing the
SLS here will protect the amplifier and other electronic equipment from an
lightning surge if that exterior speaker line is induced by lightning.
B. At the Electronic
Equipment
Connect the other
electronic equipment, such as preamplifiers,
EQ units, tuners,
and interior speakers to the sound
system.
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FIG-4: Stadium/Ballpark/Outdoor
Arena/Venue.
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FIG-4: Stadium/Ballpark/Outdoor
Arena/Venue.
A. After the Electronic Equipment
Connect the speaker line
that will be running outside of the building to the SLS directly after the
amplifier and other electronic components. Installing the SLS here will
protect the amplifier and other electronic equipment from any lightning
surge that may occur if that exterior speaker line running between is induced by lightning.
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Conclusion
Of course, if you have any
questions regarding the SLS,
TLS, CV-600, IT-600, or any one of
Grommes~Precision's products,
please feel free to contact us.
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