Ampetronic CLS2 System manual

CLS2 Installation Handbook
1
Handbook Contents
•Safety
•Introduction
•Block diagram
•Overview
•Connections
•Installation
•Troubleshooting
•Accessories
•Technical Specifications
•Warranty
•Declaration Of Conformity
Box Contents
1 x CLS2
1 x ‘Installation Handbook’
1 x Deaf logo
1 x P-clip, nut & washer
This symbol is used to alert the user to important
operating or maintenance instructions.
The Lightning bolt triangle is used to alert the user
to the risk of electric shock.
SAFETY
1. It is important to read these instructions, and to follow them.
2. Keep this instruction manual in an accessible place.
3. Clean only with a dry cloth. Cleaning fluids may affect the equipment.
4. Do not install this equipment near any heat sources such as radiators, heating vents
or other apparatus that produces heat.
5. WARNING – THIS APPARATUS MUST BE EARTHED / GROUNDED.
6. Only power cords with the correct power connector may be used to maintain safety.
Cables incorporating the UK 13A fused plug, Schuko with earthing contacts and UL
approved “grounding type” are acceptable. These must be plugged into power outlets
which provide a protective earth.
7. Refer all servicing to qualified personnel. Servicing is required when the apparatus
has been damaged in any way, such as a power supply cord or plug is damaged,
liquid has been spilled or objects have fallen into the apparatus, the apparatus has
been exposed to any rain or moisture, does not operate normally or has been
dropped.
8. WARNING – To reduce the risk of fire or electric shock, do not expose this
apparatus to rain or moisture. The apparatus shall not be exposed to dripping
or splashing and no objects filled with liquids, such as vases, shall be placed
on the apparatus.
TO PREVENT ELECTRIC SHOCK DO NOT REMOVE THE
COVER. THERE ARE NO USER SERVICEABLE PARTS
INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.

2
INTRODUCTION
The CLS2 Induction loop driver has been designed as a high quality
amplifier for use in community centres, board rooms, churches, interview
rooms, meeting rooms and classrooms. Depending on a number of factors
regarding the installation of the loop and the set-up of the amplifier the CLS2
can provide compliance with IEC60118-4 for areas >400m
2
.
The unit is designed for wall or panel installation (or optional insertion into a
1U rack space), with a hinged and detachable lid which is secured by two
PH2 screws. All connections are made via screw terminal blocks within the
amplifier case and cables are brought into the unit through 20mm ‘knock-out’
holes on the top, bottom or back face of the amplifier. All adjustments are
made within the amplifier case reducing the likelihood of tampering after
commissioning.
Ease of installation and use have been major factors in the design,
combined with optimized performance, and the freedom from R.F.I.
generation.
The CLS2 has four audio inputs. A 100V line / speaker line, a balanced line,
a balanced microphone, and one which can be configured as balanced line
or balanced microphone.
Two additional inputs are also provided for connection to various alarm or
alert signals. Each one when operated attenuates the audio inputs and
produces a unique tone on the loop to identify the source in question.

3
Block Diagram
IP4 100V / speaker input
IP3 Line input
IP1 MIC / Line input
100V / speaker gain
Line gain
MIC / Line gain
AGC LED
MIC / Line switch
+12V Phantom
MLC -3dB thermal
limit
Over temp.
mute
Mixer / AGC
Output
stage
Loop output
Current LED
Current
control
Rectification & smoothing
30VA transformer 230V pri. 9-0-9V sec.
Mains input
Power
LED
±12V
MLC control
Alert input 1 (5- 24Vac or dc) Alert input 2 (contact closure)
520Hz
oscillator
0.5Hz
oscillator
IP2 MIC input
Mic gain

4
OVERVIEW
Mounting and Cable entry (shown with lid removed)
Knock-outs
Knock-outs
Knock-outs
Mounting holes
(5 X 10mm)
Mounting holes
(5 X 10mm)
Detachable earth lead.
MUST
be re-connected before lid is
secured.

5
Controls and Indication
CLS2CLS2CLS2
  

Line MicLine MicLine Mic
Mic / Line
switch
Mic / Line
switch
Mic / Line
switch
Mic / Line
switch
Mic / Line
switch
Mic / Line
switch
Phantom
enable
(shown in off
position)
Phantom
enable
(shown in off
position)
Phantom
enable
(shown in off
position)
Input gain
controls
Input gain
controls
Input gain
controls
Metal loss
correction
Metal loss
correction
Metal loss
correction
Output current
control
Output current
control
Output current
control
Connections (For wiring details see next section)
Live
Input 4
100V /
speaker
Input 1
Mic /
line
Input 2
Mic
Alert 1
Alert 2
Neutral
Earth
AC
power
input
Loop
output
Input 3
Mic

6
CONNECTIONS
All connections are made using screw terminals which accept up to 2.5mm
2
(14 AWG) wire. To avoid a single strand of wire shorting to other conductive
parts wires should be stripped no more than 6mm.
Signal Inputs:
Screen
- (Signal cold)
+(Signal hot)
INPUT 2 – MIC
Balanced
Microphone
Global Phantom
for inputs 1 and 2
Phantom off
Phantom on
Balanced
Microphone Balanced line
- (Signal cold)
+ (Signal hot)
Screen
- (Signal cold)
+ (Signal hot)
Screen
Un
balanced line
+ (Signal)
Screen
Global
Phantom
Note: Phantom automatically
disabled in line mode
INPUT 1 – MIC/LINE
MIC/line
switch
Phantom off
Phantom on
Phantom global to IP1 & IP2

7
Balanced line
- (Signal cold)
+ (Signal hot)
Screen
Unbalanced
line
+ (Signal)
Screen
- (Signal cold)
Screen
+ (Signal hot)
V+ (for remote module power)
INPUT 3 – LINE
V+ is fused 12Vdc for external
modules – screen return
+
-
Alert 1: 5-24VAC or DC. If
dc observe polarity
Alert 2: Normally
open contacts ALERT INPUTS
100V Line
Mono Low
Impedance speaker
Stereo Low
Impedance Speaker
Left
Right
INPUT 4
–
100V
LINE/SPEAKER
either channel
can be used
+ (Signal hot)
- (Signal cold)
+ (Signal hot)
- (Signal cold)
- (Signal cold)
+ (Signal hot)
- (Signal cold)
+ (Signal hot)

8
CAUTION
Heatsink can be
hot. Route
cables away
from heatsink
Loop
Twist feed
wires together
LOOP OUTPUT
Fuse cover
Live
Neutral
Earth
AC POWER
Washer
P-clip
Nut
30m
6mm
Sheathed
3-core
cable
Separate
cables
Cable
tie

9
INSTALLATION
System Requirements
The induction loop cable should be installed as detailed in the ‘Designing
Induction Loops’ handbook (available on request at www.ampetronic.com ),
or as per specific design instructions provided by Ampetronic.
Tools and Equipment
A magnetic field strength meter (e.g. Ampetronic FSM) or a loop receiver
(e.g. Ampetronic ILR3 or ILR3+) is vital to check that the loop system is
providing the desired level of performance.
As well as tools for securing the unit to the wall, a large flat bladed
screwdriver and hammer are required to remove the knock-outs.
A small flat bladed screwdriver is necessary to adjust the controls and
secure cables into the screw terminals.
A PH2 driver is required to open and close the lid.
Location
The unit is designed for wall or panel installation (or optional insertion into a
1U rack space), with a hinged and detachable lid which is secured by two
Phillips No 2 screws. The unit may also be used free standing.
The location must provide adequate ventilation for the unit.
If the unit is installed in an enclosed environment, sufficient airflow
into the enclosure must be provided through vents, fans or other
means.
Contact Ampetronic for advice on cooling requirements for your installation.
Once the location is decided remove the hinged lid by first unplugging the
earth wire then lifting the lid out of the hinge arrangement.
Use the base section to mark the wall for drilling.
Remove the required knock-outs for cable entry.
Knock-outs are removed from the inside of the
unit as shown by placing a screwdriver on the
edge of the knock-out (opposite the ‘tie point’)
and giving a single sharp blow to the end of the
screwdriver with a hammer or mallet.
Care must be taken during removal so that
internal parts are not damaged.
It is recommended that the AC power feed use a
single knock-out close to the AC power terminal
block and be routed away from other cables. The
loop cable should also be kept separate and use

10
its own knock-out. However if all inputs are to be used it is possible to route line
level signals with the loop cable for a short distance.
Once knock-outs are removed fit suitable cable glands with strain
relief or conduit fittings to protect the cable and maintain safety. If
the AC power is fed to the unit using a cable which is accessible
to the user use the P-clip provided for additional strain relief as
well as a suitable cable gland. see Connections drawing .
Any knock-outs left open must be blanked off with a suitable plug. Cable
glands and conduit fittings are available at most electrical suppliers.
The CLS2 is classed as permanently connected apparatus and as
such shall be installed in accordance with relevant building and
wiring regulations.
Connection and Set-up
It is advised that the loop system is initially set up using a local audio source
such as a CD player, which is not connected into any other system. This
avoids the complication of ground loops and feedback etc, whilst the unit is
set up.
The following procedure assumes cables have already been
installed to the site where the unit will be mounted and that
the AC power feed is isolated.
1. Mount the unit in its intended position.
2. Route cables / conduits to appropriate knock-outs or through the back
panel. The black heatsink bar can reach 90°C in normal operation
and may affect cables which are touching it. Cables must be
routed away from this area.
3. Turn all controls fully anti-clockwise.
4. Connect the loop feed cable into the loop terminals. The feed cable
should be tightly twisted. The ‘Designing Induction Loops’ handbook
contains more details on loop and feed cables. The correct design and
positioning of the actual loop is vital for satisfactory system performance.
If in doubt consult Ampetronic for advice.
5. Connect the signal inputs appropriately:
Microphones (balanced only): Suitable dynamic or condenser
microphones. Select phantom power as required. Connect to
appropriate terminals of INPUT 1 or INPUT 2 (with Mic/line selector
switch in the Mic. position) see Connections drawing.
Line level signals (balanced or unbalanced): From other audio
equipment such as PA system, mixing desk or CD player. If no
microphone is used connect to appropriate terminals of INPUT 1 (with
selector switch in the Line position) see Connections drawing
.