Pro Intercom PS301 Operating instructions

Brand
Pro Intercom
Model
PS301
Type
Operating instructions

Pro Intercom PS301 is the right choice if you need an intercom power supply with a program audio input and the ability to distribute program audio to any combination of the 3 circuits. It can control the level being sent to each, independently, and monitor the level of each visually. The program input on the rear panel can be either mic level or line level, chosen by the assigned DIP switch. The PS301 is capable of delivering approximately 0.8 amps per circuit, so if you have one circuit with a large number of stations on it, you may want to link it to a second circuit.

Pro Intercom PS301 is the right choice if you need an intercom power supply with a program audio input and the ability to distribute program audio to any combination of the 3 circuits. It can control the level being sent to each, independently, and monitor the level of each visually. The program input on the rear panel can be either mic level or line level, chosen by the assigned DIP switch. The PS301 is capable of delivering approximately 0.8 amps per circuit, so if you have one circuit with a large number of stations on it, you may want to link it to a second circuit.

Pro Intercom
LLC
PO Box 7035 Algonquin Illinois 60102-7035
Phone: +1 (815) 680-5205 Orders and Tech support: (888) 320-5928 Fax: +1 (815) 526-8689
[email protected] Skype: intercom4pros
Printed in USA Rev.1 20140529
PS300 & PS301
Intercom Power Supplies
(PS301 w/Program Input)
Instructions
Critical Issue
Before connecting your PS300 or PS301 to the electrical outlet
conrm that the voltage switch on the rear panel is in the correct position for your local voltage,
and that the proper fuse is installed
110/120V - 2 Amp, 250 Volt 220/240V - 1 Amp, 250V
The following Instructions are for the PS301.
See Page 2 for the PS300 which, though having the same main components, is a much simplied product.
1. Do not connect any of the intercom cabling at this time. Connect the PS301to the AC (Mains) source and
turn on the front panel power switch. Observe the column of four LEDs headed “Status”. All four should be
lit and green. The top LED indicates that the power supply is providing the 24VDC required by the intercom
circuitry. The next three indicate that there is no problem on any of three circuits. Since nothing is presently
connected to the PS301 these will all naturally be green. If any are red, turn off the PS301 and check the XLR
jacks on the back for foreign objects. If none are found, disconnect the PS301 from the AC outlet and contact
the factory.
2. Connect your intercom circuit cabling to the PS301, one connector at a time, checking the front panel
“Status” LEDs as you proceed. If any of the “Status” LEDs turn red as you proceed, stop and check the
wiring and devices connected to that circuit. There are a number of possible problems causing this warning
but by far the most probable is a mis-wired XLR connector. Check every connector for shorts between pins
and for reversals between pins. This usually occurs when wiring connectors of the opposite gender at the
same time. Such a reversal may still permit a microphone to work (out of phase and poorly) but will cause a
complete failure in an intercom system. Also check that the shield in the cable is not grounded - anywhere. In
a permanently installed system this includes inside conduit and electrical boxes.
3. The PS301 gives you two connection jacks to each circuit. If this is not enough you can use Y-cables or
our SB1 to get as many connections as you need on each circuit. The number of connections does not affect
the performance of the circuit. The only things that matter are the length, gauge, and capacitance of the cable
being used, and the amount of current drawn by all the stations. Ask for or publication “Cable Lengths and
Sizes” to do an accurate calculation.
4. Decide whether you want to use each of the 3 circuits independently, or that you want to combine A+B or
A+B+C and set the link switch on the front panel accordingly. Each circuit is capable of delivering approximately
0.8 amps, so if you have one circuit with a large number of stations on it, you may want to link it to a second
circuit. Unless you have an actual need to link circuits due to some unique control situation, the default
position of the link switch should be “Off”.
5. If any fault occurs in the cabling or devices on a circuit, the Status LED will turn red and the circuit will shut
down until the fault is removed. A fault in one circuit will not affect the operation of the others, unless they are
linked. The faulty circuit will restore itself as soon as the fault is removed, without “booting” the power supply.
6. Except for dealing with the Program Audio input you are ready to power up your intercom system. With 2.4
Amps of continuous power available, you should be able to power up as many as 60+ beltpacks along with
some loudspeaker stations and Blazon beacons.
7. Your PS301 is capable of distributing Program Audio to any combination of the 3 circuits. It can control
the level being sent to each, independently, and monitor the level of each visually. The LED display for each
circuit can be set to be a true VU meter, but most users prefer it to be a relative reading, with the levels set
by agreement with the listeners on each circuit.
8. The program input on the rear panel can be either mic level or line level, chosen by the assigned DIP
switch. In either case it is unbalanced, so your source must be made unbalanced at some point. The most
common program audio is a feed from the front of house console. This allows the entire technical crew to
follow the ‘run of the show’, no matter where they are located and to anticipate cues, synchronize videos,
effects, etc.
9. To operate properly, Pro Intercom audio circuits must all terminate in 200W. This makes it possible to add
and remove stations without a change in the overall level of the system, and extends the distance over which
you can send a noiseless signal. Each of the 3 circuits in the PS301 has it’s own 200W termination point
so that it can be used independently of the other 2 circuits. When you use the front panel “Link” switch to
combine A+B or A+B+C, the PS301 automatically adjusts the termination impedance so that the total always
remains 200W.
10. There may be circumstances where you want to use one or all of the PS301 circuits to boost the power of
a system which already has a termination circuit, such as an underpowered Master Station. For this reason
you can “lift” the termination of each of the PS301’s circuits using a rear panel DIP switch marked for this
purpose.
11. Your PS301 should live comfortably with other audio and lighting gear in the same rack. The power
supply is “linear” or “analog”, with a toroidal transformer, a huge rectier and a separate regulator for
each circuit. Strayeld radiation is minimal as compared to a switch-mode power supply. Temperature is
monitored and well regulated. The components likely to generate heat are mounted on a massive heat sink.
In the event of an unusual rise in temperature, a side-mounted cooling fan will come on automatically.
The PS300
The PS300 is essentially identical to the PS301 except that it does not have a program input or program
distribution capabilities. All of the above paragraphs except 7 and 8 apply equally to the PS300.
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Pro Intercom PS301 Operating instructions

Brand
Pro Intercom
Model
PS301
Type
Operating instructions

Pro Intercom PS301 is the right choice if you need an intercom power supply with a program audio input and the ability to distribute program audio to any combination of the 3 circuits. It can control the level being sent to each, independently, and monitor the level of each visually. The program input on the rear panel can be either mic level or line level, chosen by the assigned DIP switch. The PS301 is capable of delivering approximately 0.8 amps per circuit, so if you have one circuit with a large number of stations on it, you may want to link it to a second circuit.

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