Telecor SI-125 Bedienungsanleitung

SI-125 Power Amplifier Manual 1

SI-125

Power Amplifier Manual

6205 Kestrel Road; Mississauga, Ontario; Canada; L5T 2A1 November 2016, Rev 0.5

Phone: (905) 564-0801 Fax: (905) 564-0806 www.telecor.com E:\T2-108\T2-M108-ABC\T2-M108-B.doc/AD

The Telecor SI-125 Power Amplifier delivers 125 watts of audio power intended to drive

industry standard speakers for sound reinforcement and paging systems. The amplifier will

accept either a balanced or single-ended input source. A sensitivity Input Level switch is

provided to select either the 1 V (0 dB) or 100 mV (-20 dB) input level. Output terminals are

provided for 4 Ω, 8 Ω, 25 V and 70 V speaker lines. The amplifier contains current limiting

circuitry on the output to protect it from overloading. The amplifier also has circuitry to protect it

from overheating.

The SI-125 Power Amplifier can have optional modules installed for additional functionality.

The PA-AM Power Amplifier Attenuator Module allows the amplifier to support a 25 V input

signal. The PA-MM Power Amplifier Monitor Module activates a relay under normal amplifier

operation. The PA-PM Power Amplifier Paging Module provides the amplifier with additional

inputs for a low impedance microphone and two balanced line level inputs.

The SI-125 Power Amplifier conforms to UL 60065 ETL listed mark with listing number

3059290.

The following symbols are on the amplifier and in this manual:

CAUTION

These servicing instructions are for use by qualified service personnel only. To reduce the risk

of electric shock, do not perform any servicing other than that contained in the operating

instructions unless you are qualified to do so.

SI-125 Power Amplifier Manual 2

Unit Description

The various amplifier parts are:

Figure 1: SI-125 Front View

A. VU METER: The 30 dB digital VU meter shows 0 dB when the amplifier is operating at

its rated output. Exceeding the rated output will cause the output to be clipped, which will

be indicated by the illumination of the CLIP light.

B. HIGH TEMPERATURE Light: If the internal temperature of the amplifier exceeds its

normal operating limit, the High Temperature light will illuminate and the output level

will begin to be reduced. The amplifier will continue to operate at a reduced output level

until the temperature returns to an acceptable level. If the High Temperature light

illuminates, see the Troubleshooting section.

C. CURRENT OVERLOAD Light: If the current output of the amplifier exceeds its

maximum power output, the Current Overload light will illuminate and the output level

will begin to be reduced. The amplifier will continue to operate with the current limiting

circuit reducing the output power. If the Current Overload light illuminates, see the

Troubleshooting section.

D. GAIN Control: The gain of the amplifier can be adjusted using this potentiometer. The

potentiometer is concealed behind a snap-on cover. The cover can be snapped off when

the level needs to be adjusted but should be replaced to prevent unintended tampering.

The amplifier gain is set by both this control and the sensitivity Input Level switch on the

back of the amplifier.

E. POWER Switch: Turns the amplifier on and off. The switch will illuminate when the

amplifier is turned on.

Figure 2: SI-125 Rear View

SI-125 Power Amplifier Manual 3

F. FUSE: Protects the amplifier if the maximum current draw is exceeded. If the fuse blows,

see the Troubleshooting section.

G. AC Power Cord: Connects the amplifier to a standard 120 V, 60 Hz grounded outlet.

H. OUTPUT TERMINALS: Terminals are provided for 70 V and 25 V speaker lines, as

well as 8 Ωand 4 Ωloads. Class 2 wiring may be used.

Ensure that the amplifier is OFF before making, removing or handling any

input or output connections. The output cover must be in place when the

amplifier is operating.

I. ACCESSORY MODULE SLOT (for optional accessories): Several accessory

modules are available, which may be installed into the amplifier. If no accessory module

is installed, a blank cover plate covers the slot.

Please note that the accessory modules are not user installable. They must be

factory installed and ordered with the amplifier. Do not remove any modules o

the cover plate.

J. INPUT LEVEL Switch: The Input Level switch selects the range of the input level. This

switch works in conjunction with the GAIN Control on the front of the amplifier. The

Input Level switch should be set to match the level of the input in either the 1 V or 100

mV (-20 dB) range.

K. LOW CUT Switch: The Low Cut switch will reduce the low-end frequency response of

the amplifier as shown in Figure 3.

Figure 3: Relative Level (dB) vs. Frequency (Hz)

L. INPUT TERMINALS: The input terminals are electronically balanced with an input

impedance of 10 kΩ. The input signal level should be in either the 1 V or 100 mV range

with the Input Level switch set to the appropriate position. The GND terminal is

provided, if required, for grounding the cable shield.

SI-125 Power Amplifier Manual 4

Clipping

Output Clipping is the point where the peak output signal is limited to avoid damage to the

amplifier from excessive output current (current overload). Once output clipping is detected, any

increases in input level will not cause increases in output level (this is shown by the output

plateau in Figure 4). To avoid distortion, the output signal is dynamically attenuated to give the

maximum attainable output voltage without distortion, although technically the peak output level

is clipped at this point. The Current Overload light will turn on when the current limiting

circuitry is engaged.

Figure 4: Effect of Clipping

Input Attenuation will occur when the signal is limited due to excessively high signal level at

the input. The clipping LED will turn on either when there is excessive signal level on the input

or when there is hard clipping present on the output. The CLIP light will not turn on when the

output level is clipped due to current overload.

Installation

Before installing an SI-125 Power Amplifier, carefully inspect the device for any damage that

may have occurred during shipping. The shipping package should contain only the Power

Amplifier. If any part of the amplifier has been damaged, please contact the shipping company as

soon as possible.

DO NOT ATTEMPT TO INSTALL EQUIPMENT THAT WAS RECEIVED

DAMAGED.

The amplifier mounts into a standard 19" Telecor equipment rack with 10-32 screws. The SI-125

requires 5 ¼" of vertical rack space. When mounting the amplifier into a rack with other

equipment, be sure to allow for adequate ventilation. To accomplish this, ensure that a blank

panel of 1 ¾" height (or greater) is installed between the amplifier and any other equipment (e.g.

additional amplifiers, power supplies, etc.) in the rack.

SI-125 Power Amplifier Manual 5

Do Not mount the amplifier such that:

•there is inadequate ventilation.

•the vents on the top, bottom or side of the amplifier are covered or blocked.

•it is susceptible to vibration.

•it is in an area of high ambient temperature.

•it is adjacent to other heat-radiating equipment.

•it is exposed to direct sunlight.

•it is exposed to moisture.

The amplifier should be plugged into a standard three-prong 120 V, 60 Hz grounded outlet. Turn

the Power Switch off when connecting or disconnecting the AC receptacle.

Ensure that the amplifier is OFF before making, removing or handling any input o

output connections. The output cover must be in place when the amplifier is operating.

Input Connections: The screw terminals on the right side of the back of the amplifier are for

signal input. The input terminals are suitable for both balanced and single-ended inputs. A

ground terminal is provided for grounding the shield of the cable if required. An example of

typical input wiring is shown in Figure 5.

Figure 5: Input Connections

To reduce the incidence of ground loop hum, oscillation, or interference from other audio

sources:

1. Use a shielded cable for input wiring. The shield must be grounded at one end of the

cable only, not both.

2. Regardless of what type of input signal is supplied to the amplifier (balanced or single-

ended), the GND terminal should not be connected to the – (common) terminal.

3. Do not enclose input and output connectors in the same cable. Where possible and

practical, and when the wire length exceeds 6 feet, the input and output wiring, in

addition to being separate cables, should be physically separated.

Set the Input Level switch to match the level of your input. If you are connecting the input of the

amplifier to an unknown level signal, set the Input Level switch to 1 V and the GAIN Control to

0, then apply the signal and increase the gain. If an unacceptable level is not reached with the

gain at maximum: turn the GAIN Control to 0, set the Input Level switch to 100 mV, and then

increase the gain.

Ensure that the amplifier is OFF before making, removing or handling any input o

output connections. The output cover must be in place when the amplifier is operating.

SI-125 Power Amplifier Manual 6

Output Connections: The left terminal strip is the signal output of the amplifier. Terminals are

provided for 70 V and 25 V speaker lines, as well as 8 Ωand 4 Ωloads. Connect the speaker

load to the appropriate terminals depending on the load impedance. Class 2 wiring may be used.

The output of the amplifier is floating with respect to ground and should remain that way. Do not

connect the COM and GND terminals together. The GND terminal is provided for use with

shielded cable only.

To reduce the incidence of output audio being induced into other conductors, use twisted pair

wiring and keep the input and output wiring separated. To avoid overloading the amplifier,

ensure that the total speaker load impedance is no less than the values in the table below:

Output Terminals Maximum Load /

Minimum Impedance

70 V 39 Ω

25 V 5 Ω

8 Ω8 Ω

4 Ω4 Ω

Line Impedance Measurements: Measure the amplifier’s load impedance using an audio signal

impedance meter (1 kHz) with the amplifier output disconnected. Also measure the impedance

of each side of the load to earth ground, which should be an open circuit. If it is not (i.e. there is a

fault to ground), isolate the fault and correct it. Do not operate the amplifier on a ground-faulted

output line.

Note: In school applications, there is often a privacy switch in the room. When this switch is

activated, it grounds one side of the room speaker line through a transformer. Make sure that all

these privacy switches are not in the Privacy position when measuring line impedance to ground.

These switches do not adversely affect the operation of the amplifier.

When measuring load impedance on a Telecor installation, disconnect the amplifier output from

the line, connect the impedance meter across the line, make sure the system is in an ALL CALL

mode, and then measure the line’s impedance and check for line ground faults.

Operation

•Before turning the amplifier on, ensure that:

othe speakers have an adequate power rating.

othe proper output terminals have been used.

othe gain of the amplifier is appropriate for the input signal supplied.

•If you are unsure about the Input Level and gain settings, turn the GAIN Control to

minimum before turning the amplifier on.

•Once the amplifier is mounted and wired, turn the unit on. The Power Switch will

illuminate. Watch the VU Meter on the front of the Power Amplifier. With no signal

connected, ensure that none of the LEDs are illuminated. If any LEDs illuminate, refer to

the Troubleshooting section

•With the signal applied, adjust the GAIN Control until an appropriate output level is

obtained. If the Current Overload or Clip lights illuminate, see the Troubleshooting

section

•To reduce the low frequency amplification, set the Low Cut switch to the CUT position.

SI-125 Power Amplifier Manual 7

Optional Modules

Additional functionality can be added to the SI-125 Power Amplifier with the factory installation

of one of the following optional modules.

Note: These modules must be ordered at the same time as the SI-125 Amplifier as they cannot be

installed in the field at a later time. These modules are installed on the rear of the amplifier by the

Telecor factory and therefore cannot be ordered independently without an amplifier.

The PA-AM Power Amplifier Attenuator Modules provides the amplifier with the ability to

support a 25 V input signal which is attenuated by -25, -45, or -70 dB. Refer to the PA-AM

Power Amplifier Attenuator Module Manual for more information.

The PA-MM Power Amplifier Monitor Module will monitor the operational status of the

amplifier. As long as the amplifier is operating normally, a relay will be activated. Refer to the

PA-MM Power Amplifier Monitor Module Manual for more information.

The PA-PM Power Amplifier Paging Module adds three additional input options to the

amplifier: one low impedance microphone and two balanced line level inputs. The three inputs

have adjustable level and remote mute controls. The three inputs can also be assigned to one of

three available priority levels. Refer to the PA-PM Power Amplifier Paging Module Installation

Guide for more information.

Troubleshooting

Problem Description

VU Meter registers a signal when

no signal should be present.

The amplifier may be oscillating, possibly at a very high frequency.

This may be caused by: running input and output wires close

together, grounding the input, or incorrect grounding of the shield.

The Current Overload light

illuminates or flashes.

This indicates that the amplifier is being overloaded. Check the

total speaker load on the amplifier. Also check for shorts in the output

wiring and for shorts to ground. If the amplifier is being overloaded,

reducing the load or the gain should solve the problem.

The Clip light illuminates or

flashes. The input level to the amplifier is too great. Correct either by

turning down the GAIN Control or by reducing the Input Level at the

source of the amplifier’s audio signal.

The High Temperature light

illuminates.

This indicates an excessively high temperature on the heat sinks.

When this occurs, the output level is reduced until the temperature

returns to normal. Overheating of the heat sinks is usually caused by

insufficient ventilation or operating the amplifier in an overload state

for an extended period of time. Check the loading and ventilation of

the amplifier.

Fuse blows. This indicates excessive current draw by the amplifier. To replace

the fuse, turn the amplifier Power Switch OFF and unplug the

amplifier from the AC receptacle. Unscrew the fuse knob and replace

the fuse with the same type, voltage and current rating as indicated

on the amplifier and below:

SI-125 amplifier uses a 3AG 250V 3.5A fuse.

If the new fuse also blows, unplug the amplifier and contact Telecor

Technical Support.

SI-125 Power Amplifier Manual 8

Specifications

Characteristics: SI-125 Power Amplifier

Input Level 1 V or 100 mV (switchable)

Input Impedance 10 kΩ(balanced)

Output 125 watts RMS into balanced 4 Ω, 8 Ω, 25 V or 70 V line

Frequency Response 50 to 15000 Hz (± 2 dB)

Total Harmonic Distortion 0.05% @ 1 kHz rated output

Output Regulation (with

Transformer) < 1 dB, no load to full load

Signal to Noise Ratio

(Band Pass 20 to 20000 Hz) Input Level switch in 0 dBv (1 V) position: > 94 dB

Connectors Screw-Barrier Terminals on input and output.

Mas-Con connectors are used with optional modules

Controls Power Switch (Illuminated), GAIN Control, Low Cut Switch, Input

Level Switch (1 V / 100 mV)

Indicators Clip, High Temperature, VU Meter and Current Overload

Protection Foldback current limiting, Over-temperature protection, Primary

circuit fused at 3.5 A

Temperature Range -10°C to +35°C (14°F to 95°F)

Power Consumption AC 120 V, 60 Hz, 270 W

Weight 11.8 kg (26 lbs.)

Dimensions

(without amplifier handles) 5 ¼" H x 19” W x 12 ⅛" D

Finish Black Powder Coating

Optional Modules

PA-AM Power Amplifier Attenuator Module

PA-MM Power Amplifier Monitor Module

PA-PM Power Amplifier Paging Module

Specifications are subject to change without notice.

SI-125 Power Amplifier Manual 9

LIMITED WARRANTY POLICY

Telecor Inc. warrants all products bearing the Telecor name to be free from defects in material and

workmanship under normal use and service for a period of one year from date of delivery. Telecor will

repair or replace (at our option), free of charge, any unit that is found to be defective and returned to us

under warranty. Telecor warrants all other products made by others, and distributed by us, to be covered

by the manufacturers' warranty period.

This warranty shall not apply to any Telecor products that have been subject to misuse, neglect, accident,

modification, water, fire, lightning, paint, or used in violation of instructions furnished, repaired or altered

outside of the factory. This warranty does not cover batteries, bulbs, fuses or damage caused by batteries

used in connection with the product. Telecor reserves the right to make the final decision on whether

there is a defect in materials or workmanship, and whether or not the product returned is within the

warranty period.

This warranty covers bench repairs only. Telecor will not be responsible for any costs incurred involving

on-site service calls. Repair or replacement by others, fire, transportation, labor charges, indemnity, etc.,

are not covered by this warranty and no responsibility for same will be assumed by us. Our liability does

not extend to consequential damage.

AUTHORIZED REPAIR STATION:

All participating Distributors and Dealers are authorized to accept Telecor products for return to us for

repair or replacement, or customers may return goods to us directly, providing that return authorization

has been obtained.

U. S. customers are required to ship any returns or repairs to:

Telecor Inc.

2434 Jerauld Avenue * U. S. customers must not

Niagara Falls, New York return products to Canada

USA, 14305

Canadian and all International customers are required to ship any returns or repairs to:

Telecor Inc.

6205 Kestrel Road

Mississauga, Ontario

Canada, L5T 2A1

For details on Telecor’s Return Policy, see our Published Merchandise Return Policy.

E:\T2-108\T2-M108-ABC\T2-M108-B.doc/AD

reproduced in any form, or by any means, without the prior written permission of Telecor Incorporated.

Telecor Inc. makes no representation of warranties with respect to this manual. Furthermore, Telecor

reserves the right to make changes in the specifications of the products described in this manual at any

time without notice, and without obligation of Telecor to notify any persons of such revisions or changes.

www.telecor.com

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