Pro Intercom PS300 Instructions

PS300 & PS301
Intercom Power Supplies
(PS301 w/Program Input)
Instructions
Critical Issue
Before connecting your PS300 or PS301 to the electrical outlet
confirm 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 simplified 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.
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
support@prointercomllc.com Skype: intercom4pros
Printed in USA Rev.1 20140529