Cloud CXL-40T User manual

CXL-40T
Installation Guide
Cloud Electronics Limited
140 Staniforth Road, Sheffield, S9 3HF England
Tel [phone]
Fax [phone]
E-mail [e-mail]
Web site http://www.cloud.co.uk

CXL-40T:Installation Guide 1
15/11/04 V2
CXL-40T
Installation Guide
1Introduction
The CXL-40T is a high performance 70V/100V-line output transformer intended for use in high
quality background music and public address applications in systems up to 40W rms. It is
compatible with the following Cloud products: 36/50, 46/50, CX-A450 & CX-A850.
2Electrical safety
The 100V/70V-line system is capable of delivering an electric shock. To comply with relevant
safety standards, the CXL-40T must be installed with the appropriate level of care intothe Cloud
CXL-800 rack housing. The internal insulation board and external connector cover must be fitted
to the CXL-800 to provide adequate shock protection.
3Wiring the CXL-40T
Using at least 1.5 mm² cable, wire the output of the amplifier to the 2 pole connector and connect
to the CXL-40T ‘AMPLIFIER’ terminations observing polarity. The 70V/100V-line output uses the
3 pole connector; for 70V speakers, use the 0V (-) and 70V (+) terminations and for 100V
speakers use the 0V (-) and 100V (+) terminations. The speaker cable must be at least 0.75mm²,
double insulated. With long distances it may advantageous to use thicker cable. The CXL-40T
provides a fully balanced output signal which is isolated from the amplifier.
PCB Pin No
Cable-colour
Connection Name
1
Red
Amplifier positive
2
Black
Amplifier negative
3
White
100V
4
Purple
70V
5
Blue
0V
Connections to the CXL-40T
4High pass filter -jumper settings
The CXL-40T may be used at full power with frequencies down to 45Hz. If it is operated with
high input levels at frequencies below 45Hz it may saturate and cause the driving amplifier’s VI
limiter to operate. The Cloud 36/50, 46/50, CX-A450 and CX-A850 are fitted with an internal
65Hz filter that can be turned ON or OFF by configuring its specific jumper. The filter of a channel
or zone must be ON when the channel has a CXL-40T installed since it will protect the
transformer from the high level low frequency signals that cause saturation.
Caution:Remove the power cable before removing any cover to reveal the jumpers.
Always use identical fixing screws when replacing product covers.
36/50 The list below details the relevant jumpers for the 65Hz high pass filter:
Zone 1 = J5Zone 2 = J8Utility = J9
(Refer to the 36/50 manual for full details)
46/50 The list below details the relevant jumpers for the 65Hz high pass filter:
Zone 1 = J7Zone 2 = J8Zone 3 = J13 Zone 4 = J14
(Refer to the 46/50 manual for full details)
CX-A450 The list below details the relevant jumpers for the 65Hz high pass filter:
Ch 1 = J1Ch 2 = J2Ch 3 = J3Ch 4 = J4
(Refer to the CX-A450 manual for full details)
CX-A850 The list below details the relevant jumpers for the 65Hz high pass filter:
Ch 1 = J1Ch 2 = J2Ch 3 = J3 Ch 4 = J4
Ch 5 = J5Ch 6 = J6Ch 7 = J7Ch 8 = J8
(Refer to the CX-A850 manual for full details)

2CXL-40T:Installation Guide
15/11/04 V2
5Mechanical Installation
Important: The CXL-40T must be fitted to the CXL-800 rack housing to comply with the relevant
safety standards.
The CXL-40T is a toroidal transformer. A single M6 mounting bolt is supplied to fix the toroid to
the CXL-800 rack housing. Once the CXL-40T is fitted, remove the insulation board to gain
access tothe inside surface of the rear panel; the attached PCB should be fixed to the inside
surface of the rear panel using the two M3 x 6mm machine screws. No special ventilation
provisions need to be made for the CXL-40T as its high efficiency means little power is
dissipated. The CXL-40T should not be mounted close to mains transformers or any other
source of strong magnetic fields. Where the use of the CXL-800 is not possible, the CXL-40T
must be installed within an insulated housing that conforms to the requirements of BS EN 60065.
6The CXL-800
The CXL-800 provides convenient and safe rack mounting for up to eight CXL-40T 100V/70V-line
transformers into a 19” rack enclosure (2U). The CXL-800 is 225mm deep but allowsa depth of
at least 250mm to provide clearance for connectors. Once the toroidal transformers have been
fitted, it is important to replace the internal insulation board and the plastic cover used to protect
the rear panel connectors. The CXL-800 is designed for static applications only;extra support
may be required in portable equipment.
7Technical Specifications
Maximum input voltage
16V rms
Input impedance
4 Ohms (with 250 Ohm secondary load)
Output power rating
40W RMS
Minimum load impedance
250 Ohms
Distortion
<0.01% @ 1kHz
Frequency response
40Hz to 20KHz (-2dB)
The CXL-40T conforms to the following European Standards:
BS EN 55103-1: 1997
BS EN 55103-2: 1997
CAUTION -SERVICING
THIS UNIT CONTAINS NO USER SERVICEABLE PARTS. REFER ALL SERVICING TO QUALIFIED
SERVICE PERSONNEL. DO NOT PERFORM ANY SERVICING UNLESS YOU ARE QUALIFIED TO
DO SO.
WARNING
TO REDUCE THE RISK OF ELECTRICAL SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR
MOISTURE.
CAUTION -SHOCK HAZARD
THE CXL-40T MUST BE MOUNTED IN THE CXL-800 HOUSING
CLOUD ELECTRONICS LTD ACCEPT NO RESPONSIBILITY FOR HAZARDOUS INSTALLATIONS.
CLOUD Electronics Limited 140 Staniforth Road Sheffield S9 3HF England
Telephone [phone] Fax [phone] E-mail: [e-mail]
Website –www.cloud.co.uk
In the interest of continuing improvements Cloud Electronics Limited reserves the right to alter
specifications without prior notice. E&OE