E2S BExL25D Manual De Instrucciones página 4

14)
End of Line DC Monitoring
On BExL25D and BExL15D loudspeakers, dc line monitoring
can be used if required. Both the 100V Line units and the
Low Impedance units have a blocking capacitor fitted. It
should be noted that each loudspeaker has a 1M ohm bleed
resistor connected across the blocking capacitor and this
should be taken into account when selecting the value of the
end of line monitoring resistance.
The end of line monitoring resistor can be connected across
the terminals on the end of line unit. On the low impedance
units care must be taken with the polarity of the monitoring
voltage.
On 100V line units the end of line resistor used must have a
minimum resistance value of 4k7 ohms and a minimum
wattage of 2.5 watts
On low impedance units the end of line resistor used must
have a minimum resistance value of 2k ohms and a minimum
wattage of 0.5 watts or a minimum resistance value of 500
ohms and a minimum wattage of 2 watts. On the low
impedance units care must be taken with the polarity of the
monitoring voltage. If an end of line resistor is fitted to a unit
the links on the printed circuit boards of all loudspeakers in
the line must be cut for the dc blocking capacitors to be in
circuit in order to dc monitor the line (see figure 5).
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European Safety Systems Ltd. Impress House, Mansell Road, Acton, London W3 7QH sales@e2s.com Tel: +44 (0)208 743 8880
www.e2s.com Fax: +44 (0)208 740 4200
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Document No. IS 2423-P Issue B 17-04-02 Sheet 4 of 4 (4