RTS Systems PS8 User manual

TECHNICAL MANUAL
TM2809 / 0/N 9300-2809-00
Third Edition / October, 1988
MODEL PS8
Power Supply
O/N 9010-2732-00
TW INTERCOM SYSTEM
RTS SYSTEMS, INCORPORATED
1100 West Chestnut Street / Burbank, California 91506 / Phone [phone] / FSCM; 60572

TECHNICAL MANUAL
Model PS8 Power Supply
a
PROPRIETARY NOTICE
The information and design disclosed herein were
originated by and are the property of RTS Systems,
Inc. RTS Systems, Inc. reserves all patent,
proprietary design, manufacturing, reproduction, use
and sales rights thereto, and to any article disclosed
therein, except to the extent rights are expressly
granted to others.
UNPACKING INFORMATION AND INSPECTION
Immediately upon receipt of the equipment, inspect
the shipping container and the contents carefully for
any discrepancies or damage. Should there be any,
notify the freight company and the dealer at once.
The shipping Model PS8 container should contain the
following components:
COPYRIGHT NOTICE
Copyright 1988 by RTS Systems, Inc„ Reproduction
in whole or m part without prior written permission
from RTS Systems, Inc. is prohibited.
TECHNICAL MANUAL TM 2809
MODEL PS8 POWER SUPPLY
Ordering Number 9010-2732-00
RTS Systems
XUy £arl..Number
1 9010-2732-00
l 9300-2809-00
1 9110-2044-02
1 9110-1609-02
4
description
Model PS8
Instruction Manual
Large Rack Ear
Small Rack Ear
Rubber Feet
Printing History:
First Edition September, 1981
j Second Edition July, 1986
Third Edition October, 1988
This manual is published by the engineering
department of RTS Systems, Inc, f which is responsible
for its contents.
Written by: Dan Register
Edited by: Kent Power
Lianne Sterling Swanson
Address all communication regarding this publication
to:
Director of Engineering
RTS Systems, Inc.
1100 West Chestnut Street
Burbank, CA 91506
QUICK TABLE OF CONTENTS
Unpacking Information
Table Of Contents iii
Warranty,. v j
Shipping Information . v i
Description & Specifications *^.,....*.1-1
Installation
Operating Instructions..... 3-1
Theoiy Of Operation...
Maintenance..............
Lists Or Replaceable P^rts.6-1
Drawings... ™ ..7-l
(, ' RTS Systems, Inc. Burbank, CA 91506 / FSCM; 60572 / TM2809 / Third Edition, October 1988
Page ii

TECHNICAL MANUAL
Model PS8 Power Supply
TABLE OF CONTENTS
Unpacking Information
Table Of Contents,,,,.
Warranty.
Shipping Information....
ii
iii
vi
vi
SECTION 1: INTRODUCTION AND SPECIFICATIONS
RefJNa, Title
1.1
1.2
1.3
1.4
1.5
1.6
Introduction.,....
Powering...
Dual Audio Impedance.
Connections.
Package .
PS8 Specifications..
Page
.... 1-1
.... 1-1
..,, 1 - 1
" 1-1
... 1-1
.,. 1 -2
SECTION 2: INSTALLATION
Ref No, Title
2.1 Mechanical Installation.
2.2 Outputs ..
23 Power and Input power Selection,
2.3.1 115/230 Conversion Switch.
23.2 External Fuse..
233 Internal Fuse ..„
23,4 Power Indicator .
SECTION 3; OPERATION
Ref . , N o., ms
3.0 Introduction,.,.,.
3.1 Front and Back Panel Controls
3.2 Tandem Operation....,,,...,.
Pane
.... 2 -1
.... 2 -1
„„2-l
.... 2 -1
.,,, 2 -1
.,,, 2 -1
Z.2-1
.,,.3-1
.,,*3-1
Z.3-6
SECTION 4: THEORY OF OPERATION
Ref. No. Title Pa ^ e
4.1 General Overview....*.......4-1
RTS Systems, Inc. Burbank, CA 91506 / FSCM: 60572 / TM2S09 / Third Edition, October 1988

TECHNICAL MANUAL
Model PSS Power Supply
TABLE OF CONTENTS (Continued)
SECTION S: MAINTENANCE, TEST PROCEDURE & TROUBLESHOOTING
Ref. No, Title
5.0
5.1
5.2
5.2.1
5 - 2.2
5,23
5.3
5.3.1
5.4
5.5
5.5.1
5.5.2
5.5.3
5.5.4
5.6
Introduction..
Warranty Information..
General Maintenance .
Safety Considerations.
Access .
Cleaning.
Input Power Selection..
Fuse Replacement...
Test Procedure Set Up.
Test Procedure.,....,..
Initial Inspection..
Safety Check....
Power Supply..
Performance Check,.......,.,..
PSS Troubleshooting Chart
Page
..,5-1
...5-1
™ s -i
...5-1
...5-1
...5-1
...5-1
5-3
..5-3
...5-3
..5-3
..5-3
,.5-3
.,5-5
SECTION 6: LISTS OF REPLACEABLE PARTS
Rgf.No. Title Pgge
6.1 Introduction...,^,...*..,^.. 4 . . .
6.1.1 Division Of Parts List Into Sub-Parts Lists....*.. 6-1
6.2 How To Obtain Farts.6-1
63 Shipping List.,..*........*.*.6-1
6*4 FS8 Final Assembly..*.............6-2
6.5 PSS Back Panel Assembly ..*.......6-2
6.6 PS8 Printed Circuit Board Assembly..,*....*-....*. 4 . . . 6-2
SECTION 7: DRAWINGS AND APPENDICES
Title (Drawing Number) Page
Schematic* Model PSS (SD2717),„„............„„,7-2
Assembly Diagram, Printed Circuit Board Board (AS2717)...7-3
Model PSS Mounting Options.*............ . . . . . . . . 7 -4
Model PSS Installation Drawing (ID4G34)........7-5
RTS Systems, Inc. Burbank, CA 91506 / FSCM: 60572 / TM2809 / Third Edition, October 1988
Page iv

TECHNICAL MANUAL
Model PS8 Power Supply
INDEX OF FIGURES
2-1 Outline Drawing, Mounting Options.
2- 2 Outline Drawing, Model PS8 Power Supply.
3- 1 Model PS8 Front Panel.,...*.*...*.***.,*..*.*.
3-2 Model PS8 Rear Panel.* . *.
3-3 Model PS8 Capacity, Local.
3-4 Model PS8 Capacity, Long Distance*.*...*.* . . . . .
3- 5 Model PS8 Tandem Operation Configuration .
4- 1 Model PS8 Block Diagram.*..*...
5- 1 PS8 Test Fixture.
2age
,...1-3
..,, 2 -2
... 3-2
... 3-3
...3-4
...3-5
...3-6
...4-2
...5-2
RTS Systems, Inc. Burbank, CA 91506 / FSCM: 60572 / TM2809 / Third Edition, October 1988
Page v

TECHNICAL MANUAL
Model PS8 Power Supply
RTS SYSTEMS* LIMITED WARRANTY
The products of RTS Systems, Inc., a California
corporation, are warranted to be free from defects in
materials and workmanship for a period of one year
from the date of sale.
RTS Systems* sole obligation during the warranty
period is to provide, without charge, parts and labor
necessary to remedy covered defects appearing in
products returned prepaid to:
RTS Systems,
1100 W. Chestnut Street,
Burbank, California, 91506, U.SA„
This warranty does not cover any defect, malfunction
or failure caused beyond the control of RTS Systems,
including unreasonable or negligent operation, abuse,
accident, failure to follow instructions in this Manual,
defective or improper associated equipment, attempts
at modification and repair not authorized by RTS
Systems, and shipping damage. Products with their
serial numbers removed or effaced are not covered by
this warranty.
To obtain warranty service, follow the procedures
entitled "PROCEDURE FOR RETURNS" and
"SHIPPING TO MANUFACTURER FOR REPAIR
OR ADJUSTMENT" listed below.
This warranty is the sole and exclusive express
warranty given with respect to RTS Systems' products.
It is the responsibility of the user to determine before
purchase that this product is suitable for the user's
intended purpose.
ANY AND ALL IMPLIED WARRANTIES,
INCLUDING THE IMPLIED WARRANTY OF
MERCHANTABILITY ARE LIMITED TO THE
DURATION OF THIS EXPRESS LIMITED
WARRANTY.
NEITHER RTS SYSTEMS NOR THE DEALER
WHO SELLS RTS SYSTEMS* PRODUCTS IS
LIABLE FOR INCIDENTAL OR
CONSEQUENTIAL DAMAGES OF ANY KIND.
RETURN SHIPPING INSTRUCTIONS
Procedure for returns:
If repair is necessary, contact the dealer where this
unit was purchased.
If repair through the dealer is not possible, contact
the RTS Systems Customer Service Department by
telephone, as directed below, to obtain a Return
Authorization Number.
DO NOT RETURN ANY EQUIPMENT TO THE
FACTORY WITHOUT FIRST OBTAINING A
RETURN AUTHORIZATION NUMBER.
Be prepared to provide your company’s name,
address, phone number, a person to contact regarding
the repair, the type and quantity of equipment, a
description of the defect, and the serial number(s).
Questions regarding returns for repair should be
directed to: Customer Service Department
RTS Systems, Inc.
1100 W. Chestnut St.
Burbank, CA 91506, U.S A.
Telephone: [phone]
TELEX: 194S55
TWX: 910498-4987
FAX: [phone]
SHIPPING TO MANUFACTURER FOR REPAIR
OR ADJUSTMENT
All shipments of RTS Systems, Inc, equipment should
be prepaid via United Parcel Service or the best
available shipper. The equipment should be shipped
in the original packing carton; if not available, use any
suitable container that is rigid and of adequate size. If
a substitute container is used, the equipment should
be wrapped in paper and surrounded with at least
four inches of excelsior or similar shock-absorbing
material. All shipments should be directed to the
attention of the Customer Service Department and
must include the Return Authorization Number.
Upon completion of repairs equipment will be
returned via United Parcel Service or specified
shipper, collect.
RTS Systems, Inc. Burbank, CA 91506 / FSCM: 60572 / TM2809 / Third Edition, October 1988
Page vi

TECHNICAL MANUAL
Model PS8 Power Supply
SECTION 1: INTRODUCTION AND
SPECIFICATIONS
1.1 INTRODUCTION
In the TW Intercom System, the power supply is
considered the heart of the system. The Model PS8
Power Supply is designed to function in applications
employing small-size TW Intercom Systems. The unit
is completely self-contained and features two-channel
operation; one Vet" channel with 32 volts DC and
one "dry" channel without voltage potential. Each
channel provides an audio termination impedance of
200 ohms.
The Model PS8 is mechanically and electrically built
to industrial quality standards, insuring long-term
usage and performance. Outputs are protected
against short circuit conditions with recovery being
automatic and instantaneous. Protection circuitry
prevents damage to the power supply from accidental
connection to 120 volt AC power lines.
12 POWERING
A single PS8 Power Supply powers: twelve user
stations without call lights, seven speaker stations
without call lights, seven user stations with call lights,
or five speaker stations with call lights. Of course* a
combination of stations may be used with respect to
maximum current capability. See Figure 3-3 and
Figure 3-4 for Model PS8 powering capability.
If still more user stations are needed* two PS8 Power
Supplies can be audio coupled together to double the
powering capability; a 1/4-inch 3-circuit phone jack is
available for this purpose. This connector can also be
used as a one-way output port when monitoring or
recording the intercom audio signals.
1J DUAL AUDIO IMPEDANCE
When two P$8 T s are combined, an impedance select
switch on each PS8 maintains, in effect, the 200 ohm
Hue termination while the pair of units provides the
equivalent current of what would be approximately a
FS20. In the normal position, the switch sets the
impedance to 200 ohms while in the dual position, a
400 ohm impedance is established. The parallel
combination of 400 ohms between the two power
supplies now becomes 200 ohms: the nominal line
impedance for the TW Intercom System.
1.4 CONNECTIONS
There are two XLR-type 3-pin male connectors
mounted on the rear panel for output interconnection
to the user stations. (The PS8 itself does not have
program insertion capability).
IS PACKAGE
The PS8 is housed in a metal enclosure measuring
1.75 inches high by 8*38 inches wide by 7.5 inches
deep. The unit is completely enclosed and may be
used free standing, or rack mounted. All electrical
components are assembled on a single circuit board
allowing easy adjustment or servicing; immediate
access is accomplished by removing four screws and
sliding the top and bottom covers back along their
respective channels.
RTS Systems, Inc. Burbank, CA 91506 / FSCM: 60572 / TM2809 / Third Edition, October 1988

TECHNICAL MANUAL
Model PS8 Power Supply
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1.6 PS8 SPECIFICATIONS
OUTPUTS:
One powered channel, CHI (audio + DC + 200 ohm audio termination)
One passive channel, CH2 (audio + 200 ohm audio termination)
OUTPUT VOLTAGE: Nominal open circuit + 32 volts, + 0.5 V.-1.5 V
Full load +26 volts
OUTPUT IMPEDANCE: 200/400 ohms switchable
On powered channel: 200 ohms is maintained from 17 to 32 volts output
OUTPUT CURRENT: @ 26 volts 0.4 amps
@ 32 volts 0.5 amps
INTERCOM AUDIO: NOMINAL LEVEL: 2.0 volts p p
MINIMUM HEAD ROOM 6 dB minimum
TERMINATION: 200 or 400 ohms + 10% Both channels
FREQUENCY RESPONSE: 75 Hertz to 20 KHz *3 dB, no load
SIGNAL TO NOISE RATIO: 55 dB Ref. 2.0 V peak-to-peak
TEMPERATURE: Operating 0 to + 50
Storage -40 to +70
POWER REQUIREMENT: 24 volt-amps (120/240 VAC, 50-60 Hz)
DIMENSIONS: Height:
Width:
Depth:
Weight:
Finish:
1.75 inches (43.62 mm)
8375 inches (212.73 mm)
7.50 inches (190.50 mm)
5 pounds (2.25 kilograms)
Light gray enamel paint
SPECIFICATION NOTES: 0 dBu = 0.775 r.m.s
All production information and specifications are subject to change without notice.
RTS Systems, Inc. Burbank, CA 91506 / FSCM: 60572 / TM2809 / Third Edition, October 1988
Page 1-2

TECHNICAL MANUAL
Model PS8 Power Supply
Stand-Alone
Single Rack Mount
Figure 2-1
Outline Drawing, Mounting Options
RTS Systems, Inc. Burbank, CA 91506 / FSCM: 60572 / TM2809 / Third Edition, October 1988

TECHNICAL MANUAL
Model PS8 Power Supply
SECTION 2: INSTALLATION
2-1 MECHANICAL INSTALLATION (See Figure 2-
1, Outline Drawing Mounting Options, Figure 2-2,
Outline Drawing, and Figure 7-3, Installation
Diagram.)
The Model PS8 can be installed in 3 ways. A single
unit can be mounted in a half rack space using the
rack ears provided; or two PS8's can be mounted side
by side using the holes provided in the side rail along
with the short rack ears; or the units can be free
standing using the stick-on rubber feet. The rack ears
conform to standard EIA rack sues and each car can
be used on either side of the unit.
To install the Model PS8 first select the configuration
to use in your application. If mounting free standing
place the stick-on rubber feet on the bottom of the
unit in the four corners.
If rack mounting carefully remove the cover of the
unit by removing the screws and sliding off the cover.
There are 2 screws on each side rail of the unit.
Remove them. Next place the rack ears on the sides
of the unit and re-attach the screws to the sidcrails.
The nut and washer go on the inside of the unit. Be
careful not to jar or strike any of the electronic
components inside of the unit. If using two units side-
by-side fasten the two units together through the 2
holes on the common side of each unit; then attach
the short rack ears to the opposite sides. Now re¬
attach the top cover and fasten the unit to the rack.
12 OUTPUTS
Located on the back panel are the outputs. The PS8
is designed to accept standard XLR 3-pin female
connectors.
23 POWER and INPUT POWER SELECTION
Located on the back panel, lower left, is the power
cord. It is standard 18 gauge, 3 wire cord, 6 feet long
with CEE color code. It has a standard North
American 3 prong plug.
the two 4-40 phillips head screws in the top cover and
sliding the cover open.
WARNING: SEE SECTION S3 CONCERNING
POTENTIAL SHOCK HAZARD!
233 EXTERNAL FUSE
Located on the back panel, upper left, is the external
fuse. The fuse holder is a standard international type
which accepts a standard 1/4 inch by 11/4 inch AGC
or 3AG slow-blow fuse. Refer to the fuse table for the
appropriate fuse size.
233 INTERNAL FUSE
Mounted on the P.C. Board, behind the external fuse
is the internal fuse. To gain access, remove the top
cover by unscrewing the screws and sliding the cover
open. Refer to the fuse table for the appropriate fuse
size.
The internal fuse is used as a secondary safety device.
It is one fuse larger than the external fuse. If the
external fuse is blown and a larger fuse is put into its
place, the internal fuse will blow before the unit is
destroyed. If the fuses keep on blowing, the unit
needs servicing,
FUSE TABLE
115
External 1/2 amp, slow-blow
Internal 1 amp, slow-blow
230
External 1/4 amp, slow-blow
Internal 1/2 amp, slow-blow
When reinstalling the top cover, the two screws must
be installed carefully to insure a good ground
connection between the cover and the chassis.
23,4 POWER INDICATOR
23.1 115/230 CONVERSION SWITCH
Located internally, behind the external fuse and
mounted on the P,C. board is the 115/230 conversion
switch. To gain access to this switch, the top cover
must be removed. This is accomplished by removing
Located on the front panel, bottom right, is the
power-on indicator. It is a green light emitting diode
(LED).
RTS Systems, Inc, Burbank, CA 91506 / FSCM: 60572 / TM2809 / Third Edition, October 1988
Page 2-1