Clear-Com PS-702 User Manual

CLEAR-COM ENCORE

PS-702 TWO-CHANNEL POWER SUPPLY

INSTRUCTION MANUAL

PS-702 Two-Channel Power Supply Instruction Manual

Part Number 810493Z Rev. 3

Legal Disclaimers

Copyright © 2013 HME Clear-Com Ltd.
All rights reserved.
Clear-Com, the Clear-Com logo, and Clear-Com Concert are trademarks or registered trademarks of HM Electronics, Inc.
The software described in this document is furnished under a license agreement and may be used only in accordance with the
terms of the agreement.

The product described in this document is distributed under licenses restricting its use, copying, distribution, and decompilation/
reverse engineering. No part of this document may be reproduced in any form by any means without prior written authorization
of Clear-Com, an HME Company.

Clear-Com Offices are located in California, USA; Cambridge, UK; Montreal, Canada; and Beijing, China. Specific addresses
and contact information can be found on Clear-Com's corporate website:

www.clearcom.com

Clear-Com Contacts

Americas and Asia-Pacific Headquarters

California, United States
Tel: [phone]
Email: [e-mail]

Europe, Middle East, and Africa Headquarters

Cambridge, United Kingdom
Tel: [phone]
Email: [e-mail]

Canada Office

Quebec , Canada
Tel: [phone]

China Office

Beijing Representative Office
Beijing, P.R.China
Tel: [phone]

CONTENTS

OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Fail Safe Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Front and Rear Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Quick Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Intercom Line Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Line Termination (Rear Panel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Program Input (Rear Panel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Rack Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

System Checkout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Check Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Check Intercom Cable Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Final Tests. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Troubleshooting Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

PS-702 Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

TECHNICAL SPECIFICATIONS . . . . . . . . . . . . . . . . . . 4-1

PS-702 Two-Channel Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

GLOSSARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

LIMITED WARRANTY. . . . . . . . . . . . . . . . . . . . . . . . . . 6-I

Warranty Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-i

Technical Support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-i

Warranty Repairs and Returns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-ii

Non-Warranty Repairs and Returns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-ii

Extended Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-ii

Service Contract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-iii

Liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-iii

PS-702 TWO-CHANNEL POWER

i

ii

PS-702 TWO-CHANNEL POWER SUPPLY

Please read and follow

these instructions before

operating this product.

IMPORTANT SAFETY INSTRUCTIONS

1. Read these instructions.

2. Keep these instructions.

3. Heed all warnings.

4. Follow all instructions.

5. Do not use this apparatus near water.

6. Clean only with dry cloth.

7. Do not block any ventilation openings. Install in accordance with the
manufacturer’s instructions.

8. Do not install near any heat sources such as radiators, heat registers,
stoves, or other apparatus (including amplifiers) that produce heat.

9. Do not defeat the safety purpose of the polarized or grounding-type plug.
A polarized plug has two blades, with one wider than the other. A
grounding-type plug has two blades and a third grounding prong. The
wide blade or the third prong are provided for your safety. If the provided
plug does not fit into your outlet, consult an electrician for replacement of
the obsolete outlet.

10. Protect the power cord from being walked on or pinched particularly at
plugs, convenience receptacles, and the point where they exit from the
apparatus.

11. Only use attachments/accessories specified by the manufacturer.

12. Use only with the cart, stand, tripod, bracket, or table specified by the
manufacturer, or sold with the apparatus. When a cart is used, use caution
when moving the cart/apparatus combination to avoid injury from
tip-over.

13. Unplug this apparatus during lightning storms or when unused for long
periods of time.

14. Refer all servicing to qualified service personnel. Servicing is required
when the apparatus has been damaged in any way, such as power-supply
cord or plug is damaged, liquid has been spilled or objects have fallen into
the apparatus, the apparatus has been exposed to rain or moisture, does
not operate normally, or has been dropped.

15. WARNING: To reduce the risk of fire or electric shock, do not expose
this product to rain or moisture.

Please familiarize yourself with the safety symbols in Figure 1. When you
see these symbols on this product, they warn you of the potential danger
of electric shock if the main station is used improperly. They also refer
you to important operating and maintenance instructions in the manual.

PS-702 TWO-CHANNEL POWER SUPPLY

iii

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

This symbol alerts you to the presence of uninsulated dangerous
voltage within the product's enclosure that might be of sufficient
magnitude to constitute a risk of electric shock. Do not open
the product's case.

This symbol informs you that important operating and main­tenance instructions are included in the literature accompanying
this product.

Figure 1: Safety Symbols

EMC AND SAFETY

The PS-702 Two-Channel Power Supply meets all relevant CE, FCC, UL,
and CSA specifications set out below:

EN55103-1 Electromagnetic compatibility. Product family standard for
audio, video, audio-visual, and entertainment lighting control apparatus
for professional use. Part 1: Emissions.

EN55103-2 Electromagnetic compatibility. Product family standard for
audio, video, audio-visual, and entertainment lighting control apparatus
for professional use. Part 2: Immunity.

UL 60065-7, CAN/CSA-C22.2 No.60065-3, IEC 60065-7 Safety
requirements.

And thereby compliance with the requirement of Electromagnetic
Compatibility Directive 2004/108/EC and Low Voltage Directive
2006/95/EC

This device complies with Part 15 of the FCC Rules. Operation is subject
to the following two conditions: (1) this device may not cause harmful
interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.

iv

PS-702 TWO-CHANNEL POWER SUPPLY

OPERATION

INTRODUCTION

Congratulations on choosing this Clear-Com product. Clear-Com was
established in 1968 and remains the market leader in providing intercoms for
entertainment, broadcast and industrial applications. The ruggedness and high
build-quality of Clear-Com products defines the industry standard. In fact,
many of our original beltpacks and main stations are still in daily use around
the world.

The PS-702 power supply is a powerful, yet user-friendly unit that can serve
as the heart of a Clear-Com system.We recommend that you read through this
manual completely to better understand the functions of the PS-702 and how
to optimize your system setup.

Please pay particular attention to the section on system wiring, as improper
wiring detracts from the performance of the system or causes system failure.
If you encounter a situation or have a question that this manual does not
address, contact your dealer or call Clear-Com directly at the factory. Our
applications support and service people are standing by to assist you. (Refer to
Chapter 6: “Warranty” for contact information.) Thank you for selecting
Clear-Com for your communications needs.

DESCRIPTION

The Clear-Com PS-702 is a single-rack-space, one- or two-channel intercom
power supply which can provide 1.2 ampere (2 amperes peak during call
signals and other temporary events) per channel to operate Clear-Com
beltpacks and remote stations. This power is supplied to either or both
channels, and will support up to 40 beltpacks or 10 speaker stations.
Clear-Com’s advanced fail-safe design can sense the difference between a
short or an overload to optimally protect itself. Power is restored in as little as

0.5 seconds, depending upon whether there was a single or multiple short or
overload. The other channel continues to operate normally. The PS-702’s
advanced fail-safe circuit will bring the power back up even under full load
conditions. LED indicators signal a fault on either channel. A line-level
program input offers a master input level. Individual program selects, each
with its own send level, are provided for each channel. Use of a switching
power supply allows the PS-702 to operate with any AC line voltage from 100
to 240 volts AC at 50 or 60 Hz. The sturdy metal chassis and extra-thick front
panel with integral rack ears maintains legendary Clear-Com ruggedness.

FAIL SAFE POWER

An intercom power supply has special needs that are not met by traditionally
designed power supplies. An intercom power supply must work in adverse

PS-702 TWO-CHANNEL POWER SUPPLY

1-1

conditions such as low AC line voltage, momentary shorts on the DC power

1

2

3

4

5

67

8

9

10

11

121314 15

16

17

18

19

20

5

10

15

20

0

0

0.5

2

4

7

14

20

Number of
seconds to
restore

Number of recent shorts or overloads

lines to the stations, and excessive peak loads during “power-on”conditions.
The following features are incorporated into the PS-702’s power supply:

• AUTOMATIC SHORT CIRCUIT PROTECTION: The PS-702’s
internal power supply checks each channel for a short or current overload.
If it detects a short the power supply will shut down that channel. A short
duration short circuit will not cause the power supply to interrupt power.

• AUTOMATIC OVERLOAD PROTECTION: The PS-702’s internal
power supply senses the difference between shorts and overloads. If an
overload is detected the power supply will shut down that channel. An
overload lasting a short period will not cause the power supply to
interrupt power.

• AUTOMATIC POWER RESTORE: The PS-702’s internal power
supply senses the difference between short-term and long-term shorts and
overload conditions. After the first few times a short or overload occurs,
the power supply will try to restore power after only 0.5 seconds. If the
short or overload persists or occurs repeatedly, the power supply will take
progressively longer (to a maximum of 20 seconds) to try to restore
power. This protects the power supply from damage due to overheating.
Once the short is removed, the channel will recover, even under a full load
condition. The automatic power restore times are shown in the following
chart:

1-2

Figure 1-1: Automatic Power Restore Times

• INDIVIDUAL CHANNEL SHORT CIRCUIT PROTECTION: Each
individual channel is separately overload and short circuit protected and
may draw as much as 1.2 amperes, though the total to both channels is
limited to 2 amperes. A short on any one intercom line will not bring the
whole system down.

• FRONT PANEL INDICATIONS: There are two short/overload
indicators on the front panel (one for each channel) and a power indicator

PS-702 TWO-CHANNEL POWER SUPPLY

for the power supply. The short/overload indicators light steady when an
overload or short condition is detected. They blink if power to a channel
has been shut off as a result of an overload or short. There is also an
indicator to show when channels A and B are linked.

• PARALLELING MULTIPLE POWER SUPPLIES: Multiple power
supplies can be paralleled to increase system capacity. The PS-702’s
internal power supply will automatically detect the actions of other power
supplies during overloads and short circuits to restore power as quickly as
possible.

• MULTI-CHANNEL REMOTE STATIONS MAINTAIN THE
POWER LINE ISOLATION: The RM-702 and KB-702 as well as any
two-channel remote stations or beltpacks are designed to use the isolated
power provided by the PS-702. Refer to Chapter 2‚ “Installation.”

• LOW NOISE CIRCUITRY: The direct current outputs of the PS-702
contain very little hum and noise. The PS-702 does not contribute to
audible noise in the remote stations and beltpacks.

Note: Power supply lines connected together at remote stations will disable

the individual channel short circuit protection feature.

PS-702 TWO-CHANNEL POWER SUPPLY

1-3