G920D
Professional Noise Pollution Control System
IMPORTANT
Installer and Users please note:
These instructions should be read carefully and left with the user of the product for
future reference.
Before Use
You must inspect the product for any signs of damage. If the product is damaged,
DO NOT use it, and contact your supplier immediately.
General Safety Requirements
Domestic wiring must be tested periodically by a qualified electrician at least once
every 10 years or at every change of occupancy.
For office and retail premises, and buildings such as village halls, the wiring must be
inspected at least once every 5 years.
It is recommended that all building be fitted with smoke alarms (it is mandatory for
new buildings).
Product Safety
•
The G920D must be installed by a competent electrician in accordance with the
current IEE wiring regulations.
•
This appliance can be used by children aged from 8 years and above and
persons with reduced physical, sensory or mental capabilities or lack of
experience and knowledge if they have been given supervision or instruction
concerning use of the appliance in a safe way and understand the hazards involved.
•
Children shall not play with the appliance.
•
Cleaning and user maintenance shall not be made by children without
supervision.
•
For indoor use only.
•
Do not use or install this appliance in the immediate surroundings of a bath,
shower or swimming pool.
•
Do not use or install this appliance in locations where paint, petrol or other
flammable liquids are used or stored.
G920D User Guide
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Installation of the Control Panel
Remove the screws along the bottom
front edge, and above and below the
keyswitch. and remove the lid. Four
fixing holes are provided so that the
control panel can be attached to a
wall. Connect the mains input
terminals in the control panel to a
230 V AC mains supply. If using the
same supply that is connected to the
contactor, make sure that connection
is made to the permanently live, not
the switched supply.
The unit must be earthed.
Use the cable inlets at the top of the
panel for control and audio cables;
use the cable inlets at the bottom of the panel for mains wiring.
The G920D may be used in one of two different ways: either it may be used to
attenuate the audio signal to reduce the sound level, or it may be used to disconnect
the supply to the audio equipment.
If the G920D is to be used to switch the mains power to audio equipment then the
supply to this equipment should be routed through the contactor. A four pole
contactor is provided, which can be used to switch either:
• up to four single-phase circuits switched on live only
• two single-phase circuits switched on live and neutral
• three phase and neutral
A diagram on the cover of the contactor shows which terminals are connected
when the contactor switches on.
The maximum load must not exceed 32 Amps at 400 V AC on each circuit.
G920D User Guide
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Earth
Live
Neutral
L N
Neutral Out
Live Out
Neutral In
Live In
Neutral
Live
Neutral
Live
Neutral
Live
From
Consumer
Unit
Ring Main
How to switch a single-phase circuit
How to switch a ring-main
Neutral 1 Out
Live 1 Out
Live 1 In
Live 2 In
Neutral 1 Out
Live 1 Out
Neutral Out
Live 3 Out
Neutral In
Live 1 In
Live 3 In
Live 2 In
Live 2 Out
Live 1 Out
How to switch two single phase
supplies
How to switch a three phase load
G920D User Guide
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Connecting the microphone panel
Either one or two microphone panels may be connected to the G920D (Only one
microphone panel is supplied with the unit). A second panel allows the unit to monitor
sound in two different locations, or to average the readings over a larger area. The
microphone panel should be situated in the area where the sound level is to be
monitored. It should be mounted out of reach on the wall or ceiling, and fits a singlesocket flush- or surface- mount box. It may be mounted up to 50 metres from the
control panel.
Connect the microphone panel to the
control box using screened twisted
pair cable (microphone cable) or twin
twisted-pair or such as four-core
telephone cable and the plug-in
terminal blocks provided. (Four core
alarm cable is not suitable is it is not
"twisted-pair").
There are two sets of connectors
labelled “+−0”, the ones on the left
above the indicator labelled
“Microphone 1 connected” are for
microphone 1; the ones on the right
above the indicator labelled “Microphone 2 connected” are for microphone 2.
Either may be used.
The connectors are wired the same at both ends of the cable.
Connect "+" on the microphone panel to the terminal on the control box labelled “+”
Connect "−" on the microphone panel to the terminal on the control box labelled "−"
Connect "0" on the microphone panel to the terminal on the control box labelled "0"
If using microphone cable, connect the screen to the “0” terminals. If using twisted
pair, connect both cores in one pair to “0”, and use the other pair for “+” and “−”.
When power is applied, the “Microphone 1 connected” and “Microphone 2
connected” indicators illuminate if the microphones are connected correctly. If neither
microphone is correctly connected, the indicator on the front panel will flash amber to
indicate “tamper”.
DO NOT PAINT THE MICROPHONE PANEL. This may damage the microphone.
G920D User Guide
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Neutral
Live
Neutral
Live
Neutral
Live
From
Consumer
Unit
Ring Main
0
+
−
0
+
−
Mic
1
Mic
2
Fire Alarm Interface
The G920D may also be used to
control audio equipment in the
event of a fire alarm being
activated. A volt-free normally
closed switch is required from the
fire-alarm panel. This should be
connected to the two terminals
labelled “AL” (first, remove the link
between the two terminals)
Permission to connect to the fire
alarm circuit should be obtained
from the alarm maintenance
company. Alternatively, if the fire
alarm interface is not being used, and the audio equipment should need to be
disconnected for any other reason (e. g. from building security) then this can be
achieved by connecting a normally closed switch to the “AL” terminals.
If the fire alarm interface is not being used at all then do not remove the link
between the two “AL” terminals: removing the link will cause the output to be
disconnected.
The green indicator flashes if the alarm input has been activated.
Connecting the LED indicator panel.
The G920B remote indicator panel should be connected to the terminals marked
"+RYG" using four core cable as shown. + is the common positive supply. R, Y and G
connect to the red, yellow and green indicators respectively. These correspond to the
terminals on the G920B. Up to four G920B indicator panels may be connected to one
control unit. The G920B panel is not supplied as standard with the control unit, and
may be purchased from an Eagle dealer.
G920D User Guide
- page 6 -
Alarm panel
Connecting and audio input and output
If the G920D is to be used to attenuate the audio signal (rather than to switch
equipment on and off) then connect the audio input to the terminals labelled “AUDIO
IN” and the audio output to the terminals labelled “AUDIO OUT”. The circuitry is
designed for a balanced line input and output. If an unbalanced signal is used, use the
“+” and “0” terminals, connect the “−” input to 0, and ignore the “−” output.
Remote Reset
The G920D can be set either to disconnect the audio for a fixed period of time and
then reconnect it, or to disconnect the audio until a remote RESET switch is pressed.
To use the REMOTE RESET method, set the REMOTE RESET switch in the centre of
the control panel to the ON position, and connect a momentary switch to the pair of
terminals labelled “RR”.
G920D User Guide
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−
+
0
0
+
−
−
+
0
0
+
−
Right Channel Output
Left Channel Output
Right
Channel
Input
Left
Channel
Input
To remote
reset switch
Operation
The G920D continuously monitors the sound level and disconnects the mains supply
if the maximum level is exceeded. The supply remains off for a time period and then it
is reconnected. The sound level at which it switches off, and the time delay before it
turns back on can be adjusted internally.
It may also be used to attenuate the audio signal between mixer and amplifier. In
this case, the attenuation is adjusted continuously to keep the sound level below the
maximum level.
The keyswitch allows the unit to operate with the output permanently on for setting
up purposes.
The wiring between the microphone unit and the control panel is monitored by an
anti-tamper circuit, which will disconnect the mains supply if a fault is detected. If two
microphones are in use, this will only happen if both microphone connections are
faulty. If there is a fault on one microphone circuit, monitoring will continue using the
other circuit.
Coloured indicators show when the sound level is approaching the maximum level.
Display Operation
Green Normal operation
Amber 6 dB below trip level
Red 3 dB below trip level
Flashing red Output disconnected
Flashing amber Anti-Tamper circuit
Flashing green Fire alarm or unit initialising
Setting up.
Setting up should be carried out by the installer. The sound level threshold and delay
time are set on the controls inside the main control unit. The labelling should only be
taken as a guide, as room acoustics may cause differences between the sound level at
the microphone and the sound level over the area being monitored. This is especially
true if it is not possible to achieve an optimum position for the microphone unit.
The frequency response weighting switch should be set to either "A" or "C" as the
regulations require. The Noise at Work Regulations and most other legislation refer
to "A" weighting. The Audio Weighting switch is located in the centre of the control
panel. "C" weighting includes more bass frequencies than "A" weighting.
Set the MONITOR keyswitch to the clockwise position (where the output will be on all
the time). Play music or a test signal through the audio system and monitor the sound
level with a sound level meter. The sound should be monitored at the point where the
"nuisance" is occurring. For instance, if the G920D is being fitted in order to reduce
G920D User Guide
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"noise nuisance" in a residential area, then the sound level should be monitored in the
residential area in question, not in the premises where the sound is being produced.
The measurements should be taken at times when other background noise is not
present (such as traffic noise). The Environmental Health department of your local
council will be able to advise on the correct setting, and when it is considered that a
nuisance is being caused. If the G920D is being fitted in order to comply with the
Noise at Work Regulations, then measurements should be taken in area where staff
are working, not on the dance floor.
The G920D can be set either to disconnect the audio for a fixed period of time and
then reconnect it, or to disconnect the audio until a remote RESET switch is pressed.
If reset after a fixed time period is required, set the “RR” switch OFF, and set the
DELAY control to the delay that is required before the power is reconnected. If the
mains switching is not being used (only the audio interface) then the DELAY control
can be set to any value. If the mains switching is being used then a minimum delay
time of 5 seconds should be selected. It should be noted that repeated connection
and disconnection of audio equipment (especially large power amplifiers) is not
beneficial to the longevity of the equipment.
To use remote reset, install a remote reset switch as shown on page 7, and set the
“RR” switch to ON. (The DELAY control may be set to any value.) When triggered, the
output will remain off until the remote reset switch is pressed.
Set the THRESHOLD control in the main control unit so that the red indicator starts
flashing at the maximum acceptable sound level.
When setting up is complete, return the keyswitch to the anticlockwise (normal
operation) position. The contactor will now be switched off whenever the sound level
exceeds the set level.
If the display remains permanently in the "flashing amber" mode, then there is a fault
in the wiring between the main control box and the microphone panel.
G920D User Guide
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Technical Specification.
Dimensions: 286 × 225 × 82 mm
Weight: 1. 9 kg
Power requirements: 230 V ∿ 50 Hz 5 VA
Switching capacity: 4 × 400V 32 A
Monitoring range: 70 dB to 110 dB
Weighting: "A" or "C" to EN60651
Audio Input 775 mV rms (0 dBm) balanced
Audio Output 0-775 mV rms (-94 dBm to 0 dBm)
quasibalanced
Maximum attenuation: 94 dB
Connections: terminal block
Microphone Panel
Dimension: 85 × 85 × 26 mm
Weight: 0.1 kg
Microphone type: micro-electro-mechanical (MEMS)
Omnidirectional
Connections: Rewirable plug-in terminal blocks
DISPOSAL AND RECYCLING
You must not dispose of this appliance with domestic household waste.
Most local authorities have specific collection system for appliances and disposal is
free of charge to the end-user.
When replacing an existing appliance with a similar new appliance your retailer may
take the old appliance for disposal.
G920D User Guide
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SERVICE WARRANTY
Electrovision guarantees the product free from defects in materials and
workmanship for a period of twelve months.
Should this appliance be operated under conditions other than those
recommended, at voltages other than the voltage indicated on the appliance, or any
attempts made to service or modify the appliance, then the warranty will be rendered
void.
The product you buy may sometimes differ slightly from illustrations. This warranty
is in addition to, and does not affect, your statutory rights.
Our guarantee is administered by our retailers.
If your product arrives damaged, you must contact the retailer from whom you
bought it. The retailer's contact details will be on the invoice that arrived with the
product, or on the e-mail you received when you placed the order. Do not contact
Electrovision, only your retailer can arrange a replacement.
If the product"needs to be repaired or replaced, you must contact the retailer from
whom you bought it.
The retailer's contact details will be on the invoice that arrived with the product, or
on the e-mail you received when you placed the order.
If you have just received your product and require technical help in using it, please
call our Help Desk on (0845) 459 4816
If you have any other technical queries about the product, please call our Help Desk
on (0845) 459 4816.
Electrovision Ltd.,
Lancots Lane, Sutton,
St. Helens, Merseyside.
WA9 3EX
website: www.electrovision.co.uk
G920D User Guide
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