Cloud Electronics CXL-3120 User Manual

CXL-3120

100/70 V Transformer Module

Installation Instructions

Important Safety Notes

It should be recognised that 100 V-line or 70 V-line speaker systems have the
potential to deliver an electric shock. Install the CXL-3120 only in accordance
with these instructions.

In all cases, the external wiring and associated speakers will need to comply
with local electrical regulations for AC voltages up to 100 Vrms (141 Vpeak).

Do not expose the transformer to rain or moisture.

The transformer module must be installed in a safe manner.

Cloud Electronics Ltd. accept no responsibility for hazardous installations.

CXL-3120 Installation Instructions v1.0 1

INTRODUCTION

UTILITY ZONE 2

The CXL-3120 is an optional transformer module for the 36-50 Multi-Zone Mixing Amplier. It permits the 36-50 to directly drive

100 V or 70 V-line loudspeaker systems. The module itself consists of three transformers (one each for Zone 1, Zone 2 and the

Utility Output) mounted on a PCB, and is supplied in kit form with all the necessary xings and wiring. Any or all of the 36-50’s

outputs may be converted to 70/100 V-line operation as wished. Each transformer is rated at 40 W.

The CXL-3120 transformers are not of the “auto transformer” type, and hence provide a fully balanced output signal which is

isolated from the amplier.

The module is easily mounted within the 36-50’s enclosure, using pre-drilled xing holes. The outputs are then available on a 6-pin

5 mm-pitch screw-terminal connector which occupies the hole (shown below) in the rear panel normally covered by a blanking
plate.

36-50 Rear Panel

CXL-3120 Outputs

FITTING THE CXL-3120 TRANSFORMER MODULE

The module kit comprises the following items:

• CXL-3120 transformer module PCB assembly

• 8qty M3 x 6 mm xing screws

• 2qty M3 x 10 mm hex pillars

• 3qty 2-way cable assemblies, with connectors

• Cable tie

TX1 – Zone 2

TX2 – Utility Output

TX3 – Zone 1

ZONE 1

CXL-3120 transformer module PCB assembly

CXL-3120 Installation Instructions v1.02

Proceed as follows:

IMPORTANT: The CXL-3120 is preset at the factory for either 100 V-line or 70 V-line
operation, according to territory. The relevant voltage is clearly indicated on the label on the
outside of the box.

If the alternative operating voltage is needed, refer rst to the manual section “Changing the

CXL-3120 between and 100 V-line and 70 V-line operation”.

1. Disconnect the 36-50 from the mains. If it is tted in a rack, disconnect all inputs and outputs and remove it from the rack.

Orientate the unit with the rear nearest to you. Remove the top cover; retain the eight xing screws.

2. Remove the blanking plate from the SPEAKER LINE OUTPUTS connector location on the rear panel; retain the plate
and screws, nuts and washers.

3. Identify the empty six M3 holes on the right-hand side of the 36-50’s enclosure (as viewed from the rear). The CXL-3120

module is xed using these holes and the six hex spacers tted to the rear of the PCB. Align the spacers with the holes, and
x with the six M3 screws supplied.

4. Using the jumper cables supplied, connect the 2-pin headers on the CXL-3120 PCB to the corresponding headers on the
36-50 main PCB, located immediately behind the lo-Z output connector - see below. Note that any or all of the three
channels may be converted as required.

ZONE 1 UTILITYZONE 2

OFF ON

Headers for connection of

CXL-3120 transformer module

Lo-Z output

connector

5. On the 36-50’s main PCB, enable the 65 Hz high-pass lters for the relevant channels. This is important, as low frequency
signals at high level can saturate the transformer cores, causing unpleasant distortion and possibly activating the amplier’s

limiter circuitry. The jumpers are as follows:

OUTPUT JUMPER

ZONE 1

ZONE 2

Utility Output

J5
J8
J9

The approximate locations of the jumpers is shown in the diagram on page 4.

CXL-3120 Installation Instructions v1.0 3

NOT TO SCALE – ONLY PRIMARY

COMPONENTS SHOWN

OFF ON

OFF ON

J9

J5

6S 3S

OFF ON

SW FR

OFF ON

SW FR

OFF ON

OFF ON

J8

36-50 Jumper locations for Step 5.

6. Fit the two hex spacers supplied in the kit into the holes vacated in Step 2, using the same screws, nuts and washers.

7. Replace the 36-50 top cover, and reinstall in the rack (if necessary); reconnect all inputs and outputs.

8. Connect the 70/100 V-line loudspeaker system using the supplied mating connector (see section: “Output wiring”) according to
the table below:

PANEL MARKING CONNECT TO:

1 Z1+

2 Z1-

3 Z2+

4 Z2-

5 UT+

6 U T-

Zone 1 output ‘+‘

Zone 1 output ‘-‘

Zone 2 output ‘+‘

Zone 2 output ‘-‘
Utility Output ‘+‘

Utility Output ‘-‘

9. Fit the blanking plate from Step 2 onto the hex spacers (Step 6) over the connector, with the printed warnings outwards.

10. The 36-50 may now be reconnected to the AC mains and re-powered.

CXL-3120 Installation Instructions v1.04

OUTPUT WIRING

The cable used for the 70/100 V-line system must be 0.75mm² or more, double insulated and be capable of carrying at least 1 Arms.
When long distances are involved, it may be advantageous to use cable with a higher cross-section.

The 36-50’s low-impedance outputs remain active after the CXL-3120 has been

installed, but should NOT have a load connected to them while the 70/100 V-line
outputs are in use.

CHANGING THE CXL-3120 BETWEEN
100 V-LINE AND 70 V-LINE OPERATION

The secondary windings of the transformers used in the CXL-3120 module are tapped at 70 V and 100 V. The module will be

supplied pre-congured for the voltage normally used in your territory. To use the 36-50 with the “alternative” line system voltage,

the tapping must be changed. This is done by moving soldered wire links on the rear of the module PCB. There is one link for each
transformer.

NOTE: This operation should only be performed by someone experienced in PCB soldering.

The diagram below indicates the location of the solder links for each transformer:

Transformers configured for 100 V-line operation

100 V70 V

ZONE 1

Output connector

Transformers configured for 70 V-line operation

100 V70 V

ZONE 1

70 V

100 V

70 V

100 V70 V

ZONE 2

UTILITY

100 V70 V

ZONE 2

100 V

UTILITY

SOLDER SIDE OF PCB, SHOWING APPROX. LOCATIONS OF WIRE LINKS

Unsolder the links from their existing pairs of pads and re-solder them to the other pair. A desoldering tool may be helpful in

removing excess solder. Take care not to make any accidental solder “bridges” between other pads.

CXL-3120 Installation Instructions v1.0 5

SAFETY NOTES REGARDING INSTALLATION

The CXL-3120 is an accessory for the Cloud 36-50, and when installed in this product, conforms to the relevant European
Electrical Safety and EMC Standards.

The CXL-3120 is specically designed to be tted internally in the 36-50. Should the CXL-3120 be mounted in any other

enclosure, the enclosure must be electrically safe and meet the requirements of BS EN 60065.

THE INSTALLATION OF THE CXL-3120 IS BEYOND THE CONTROL OF
CLOUD ELECTRONICS LTD., AND WE ACCEPT NO RESPONSIBILITY FOR

HAZARDOUS INSTALLATIONS.

TECHNICAL SPECIFICATIONS

CXL-3120; EACH TRANSFORMER

Maximum input voltage 16 Vrms

Input impedance 4 ohms (with 250 ohm secondary load)

Output power rating 40 W

Minimum load impedance 250 ohms

Distortion <0.03% @1 kHz

CXL-3120 Installation Instructions v1.06

Cloud Electronics Limited

140 Staniforth Road

Shefeld S9 3HF

England

Tel: [phone]

Fax: [phone]

email: [e-mail]

web: www.cloud.co.uk

Cloud Electronics USA

1200 Iron Horse Drive, Unit A

Park City

Utah 84060.

United States of America.

Toll Free: 0855 810 0161

email: [e-mail]

web: www.cloudusa.pro