CIE-Group MPS1 User Instructions

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User Instructions
Music/paging Switcher
MPS1
The MPS1 is a music/paging unit which, when used with a public address amplifier, allows for two speaker zones to be controlled from an external console microphone or similar unit. The unit has an integral signal muting facility, as well as a switched 24v DC output suitable for activation of a restoration relay.
The MPS1 is supplied in a metal case that can be wall, table or rack mounted. It is powered by 240v (120v option available) 50/60 Hz AC mains and/or 24v DC supply.
Introduction:
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Technical Specifications:
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Specifications:
Zone switching: Main and auxiliary amplifier selection
Muting: 2 sets of change-over contacts (2 pole 2 way) operated from a single input
Zone relay rating: DPCO 5 Amp 250v AC contact rating with 24v DC coil
Muting relay rating: DPCO 1 Amp 30V AC contact rating with 24v DC coil, SW 24v DC Out DPCO 1 Amp 30v AC contact rating with
Relay rating: 24v DC coil
Visual status indication: By LED indicators mounted on PCB (for test purposes only)
Connections: Screw terminals on PCB
Power requirements: 240v AC 50/60 Hz (120v option), and/or 24v DC
Power consumption: 6vA @ 240v AC, 75mA using 24v DC supply
Case dimensions: 180( L) x 120(W) x 50(H) mm
Weight: 1kg
• CIE-Group reserves the right to alter the above specifications without prior notice
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Description:
• Control In:
The CONTROL input requires switch closure across the terminals P.T.T. (Press To Talk) & 0V to activate zone control. The switch will normally be a zone select switch in a microphone console. When activated three DPCO relay (RL1, RL2, RL3) circuits will be energised simultaneously, viz.: zone control, signal muting and switched 24v DC out.
• Zone Control:
The zone control section consists of a DPCO relay (RL3) which is activated by switch closure across the ‘Press To Talk’ (P.T.T.) terminals. The main 100v speaker line signal, zone 1, is connected to the MAIN AMP IN terminals which are directly connected on the printed circuit board to the MAIN SPEAKER OUT terminals, i.e. unswitched. The MAIN AMP IN terminals are also connected to the Normally Open contacts on the relay. When the relay is activated, the main amplifier signal is routed to the switched speaker output terminals (SW SPEAKER OUT) as well as the MAIN SPEAKER OUT terminals.
The AUX AMP IN terminals are connected to the Normally Closed contacts on the relay and allow a second amplifier, zone 2, to be connected. When the relay is relaxed (de-energised) the AUX AMP IN terminals are connected through to the SW SPEAKER OUT terminals. An LED adjacent to the relay illuminates when the relay is activated, giving a visual indication of its operation.
• Signal Muting:
A signal muting facility is supplied, consisting of a DPCO relay (RL2) which is activated by switch closure across the ‘Press To Talk’ (P.T.T.) terminals. All the contacts of the relay are brought out to the SIGNAL MUTE terminal group. The actual muting can be achieved in several ways depending on the system requirements, although typically the signal (from tuner, tape deck, etc.,) would be connected to the common terminal (+ SIG OUT) and the ground or screen to the normally open terminal (SCREEN). When the mute relay is activated the contacts close and the signal is short circuited. It is important to check that the source from the tuner, tape deck, etc., is suitably buffered so that shorting out the signal will not damage the source. If in doubt, the relay contacts should be configured to open circuit the signal to the amplifier.
As there are two sets of contacts available, several muting arrangements are possible. These include muting balanced signals, muting two separate signals, using one set of terminals to trigger a chime.
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• Switched 24v DC Out:
The switched 24v DC output section consists of a DPCO relay (RL1) which is activated by switch closure across the ‘Press To Talk’ (P.T.T.) terminals. One set of the relay contacts, when activated, provides a switched 24v DC output supply at the SWITCHED 24v DC OUT terminals. The current available is shared with the unswitched 24v DC output and is limited to 250mA by a fuse (F2). This switched output is ideally suited for activating a restoration relay to increase the speaker volume during paging. The second set of the relay contacts are brought out to the SPARE terminals. These may be used to trigger a chime.
• 24v DC Out:
A 24v DC fused supply is available from the unit, and is suitable for powering ancillary equipment such as microphone consoles, line amplifiers, tone generators etc. The current available is shared with the switched 24v DC output and is limited to 250mA by a fuse (F2).
• 24v DC In:
The MPS1 can be powered from an external 24v power supply via these terminals. The unit has reverse current protection, so that both the mains supply and the external 24v can be connected at the same time (e.g. when in systems requiring battery backup).
• Mains Input:
The unit is supplied with a standard input voltage of 240v 50/60Hz, although it can be supplied with a 120v 50/60Hz input as an option.
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Connection Details:
• Main Speaker OUT:
The main amplifier speakers are connected to these terminals.
• SW Speaker OUT:
The auxiliary amplifier speakers are connected to these terminals.
• Signal MUTE:
These are simply the two sets of muting relay contacts brought out to terminals. The ± SIG IN terminals refer to Normally Closed contacts, the SCREEN terminals to Normally Open contacts and ± SIG OUT to the Common contacts. For wiring options see description ‘Signal Muting’.
• Switched 24V DC OUT:
A switched 24v DC supply fused at a maximum of 250mA is available from these terminals whilst the ‘Press To Talk’ (P.T.T.) control input is activated by switch closure. The current available is shared with the unswitched 24v DC output. A spare set of potential free changeover contacts are also brought out to terminals, which are also activated whilst the P.T.T. control input is present. For wiring options see description ‘Switched 24v DC Out’.
• Control IN:
Switch closure across the P.T.T. & 0v control input terminals will activate the music/page switching, providing the facility for zone control, signal muting and switched 24v DC output.
• Main AMP IN:
The 100v output from the main amplifier is connected to these terminals. In the case of an unbalanced or polarised system the ‘earthy’ or ground line should be made to the - MAIN AMP IN terminal.
• AUX AMP IN:
The 100v output from the auxiliary amplifier is connected to these terminals. In the case of an unbalanced or polarised system the ‘earthy’ or ground line should be made to the - AUX AMP IN terminal.
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• 24v DC OUT:
A 24v DC fused supply at a maximum of 250mA is available from these terminals. The current available is shared with the switched 24v DC output.
• 24V DC IN:
An external 24v DC supply @ 1 Amp continuous current rating should be connected to these terminals, for either powering the unit or for supply backup purposes.
• Mains INPUT:
The mains power input should be connected to these terminals. The Live conductor should be connected to the terminal marked ‘L’, the Neutral to the terminal marked ‘N’ and the Earth to the terminal marked ‘E’.
Ensure that the supply cord is held firmly in place by the cable clamp adjacent the terminals. The unit is supplied with a standard input voltage of 240v 50/60Hz, although it can be supplied with a 120v 50/60Hz input as an option.
For safety reasons this unit MUST be connected to Earth.
The UK convention for mains supply colour coding is:
LIVE - BROWN
NEUTRAL - BLUE
EARTH - GREEN/YELLOW
• WARNING:
Under no circumstances should any wiring or maintenance be carried out to the unit whilst mains power is connected. All connections are via knock out holes on the sides of the box and onto screw terminals located on the printed circuit board.
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Connection Diagram:
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Notes:
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Notes:
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Notes:
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CIE-Group Ltd Widdowson Close Blenheim Ind Est Bulwell Nottingham NG6 8WB England
T +44(0)115 977 0075 F +44(0)115 9770081 E audio@cie-group.com W www.cie-group.com
Registered in England No. 2761780
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