RTS PS-31 User Manual
PS-31
System Power Supply
The Model PS-31 supplies 32 volts of regulated DC power to each of three intercom channels. It has short circuit and thermal
overload protection, with automatic recovery when the fault is removed.
Features
Program Input
There is a program input connector on the rear panel. A
channel assign switch on the front panel assigns the program to any of the three channels. A level control adjusts the
program level to the intercom channel.
Status Indicators
There is an audible alarm and a red fault indicator for current
overload indication on any of the three channels. An audible
alert switch on the front panel turns the alarm on or off, but
the fault indicator will continue to ash during current overload conditions. There is also a green status indicator for
each channel. Each of these indicators will remain lit during
normal operation, but will turn off during a channel current
overload condition. Output current is automatically reduced
during an overload and normal operation is restored when
the overload is removed.
Line Drawing
Input Power
The PS-31 is available in two versions: one for 115 VAC operation and one for 230 VAC operation. A power on/off switch
is provided on the front panel.
Intercom Channel Connections
Intercom channels are connected to the rear panel of the
PS-31. A variety of connector pin-outs is provided to accommodate individual system requirements.
Impedance Selection
The PS-31 provides the required channel terminating imped-
ance for each channel. A 200/400 Ω impedance select switch
for each channel is located on the rear panel. These switch-
es are set to 200 Ω for normal operation. The 400 Ω setting
permits two PS-31’s to be coupled to double the DC capacity
of the system.
PS-31 Specications
Channels
Three
Connectors
Six XLR-3 type connectors (two channel)
Three XLR-4 type connectors (three channel)
One XLR-3 type connector (program input)
DC Output Voltage (each channel)
32 volts nominal
Line Terminating Impedance (each channel)
200 Ω switchable to 400 Ω when operating two supplies
in parallel
Output Current Ratings
Max before fault indication: 1.5 amps
Sustained overload 50°C ambient: 20 amps
Max before foldBack limiting: 2.5 amps
Short circuit current: 0.5 amps
Startup current: 0.5 amps
Max Total Sustained Current (50°C ambient)
2.0 amps
Intercom Audio
Level: 2 volts pp nominal
Head Room: 6 dB minimum
Frequency Response: 75 Hz to 20 kHz (-3 dB) unloaded
Signal to Noise and Hum Ratio (Ref to 2 V pp)
-60 dB
Program Input
Balanced or unbalanced, transformer isolated, program
assignable to channels 1-3
Program Input Sensitivity
28 dBm to +14 dBm (Ref. 600 Ω) for 2 volts pp on RTS
line
Program Input Impedance
10,000 Ω
Program Frequency Response (-3dB)
100 Hz to 20 kHz input to RTS line.
Indicators
Channel Status: three green LEDs
Channel Fault: one red LED and one audible alarm
Thermal Overload: one red Neon type
Switches
One program channel assign switch; one audible alert
on/off switch; one power switch; three 200/400 Ω impedance select switches
Temperature
0 to 50°C operating; 0 to 75°C storage
Power Requirements
Voltage: 100, 120, 200, or 40 VAC, 50/60 Hz versions
available
Power: 100 volt-amps
Fuses
AC panel fuse: 100/120 volts-3A slow blow; 200, 240
volts - 1.5A slow blow
Internal DC fuses (each channel): 6A fast blow
Dimensions
3.5” (89 mm) high, 19” (483 mm) wide, 10.5” (267 mm)
deep
Weight
14.5 pounds (6.6 kg)
Contact Information
Telex Communications, Inc.
12000 Portland Avenue South
Burnsville, Minnesota 55337
Telephone: (800) 392-0498
Fax: (800) 323-0498
Form Number: 38110502
Date: March, 2006
Ordering Information
PS-31
3 amp power supply for 30 stations
Catalog Number: 9000323300
This specications information is preliminary and is subject to change without notication.
Brand names mentioned are the property of their respective companies.
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