PR000-00-527-01 PINSTCFDAU30
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Speaker Circuits
Cooper has two speaker Circuits, A & B. to fully comply with the requirements of EN60849 the speakers
should be wired in an interleaved pattern, so if one circuit fails messages can still be heard in the areas
covered (note it is accepted practice to only place one speaker in an office, as long as the connecting
corridor is on the other circuit).
Each output of Cooper can support 30W of speakers, this is typically five 6W speakers, ten 3W
speakers or twenty 1.5W Speakers.
6W speakers are generally fitted in noisy offices or reception areas, 3W speakers are usually used in
corridors, and 1.5W speakers in small rooms or open plan offices.
Caution Speaker circuits carry 100V AC
Disconnect before servicing to prevent Shock hazard.
Speaker Circuits on CFDAU30 are DC monitored
.
Suitable speakers for CFDAU30 MUST have a thermal fuse to disconnect the speaker if it is
in the area in fire and a DC blocking capacitor fitted, typically the capacitor is 2.2uF 250V DC.
The wiring goes through each speaker, and in the last speaker the end of line resistor. Each circuit can
have 2 spurs, the CFDAU30 is provided with two end of line resistors per circuit, both must be fitted to
avoid faults being shown on the panel. If only one spur is used per circuit, one resistor resides in the
panel; one resistor resides in the last speaker on the circuit.
Before connecting the speaker lines to CFDAU30 count the number of speakers and note the tapping
they are set at, (most manufacturers will supply speakers at the maximum tapping, or at the half power
tapping) this value should not exceed the 30W rating of the Cooper CFDAU30 for a single circuit.
It is desirable to have an impedance meter available (this measures the AC load that the Cooper
CFDAU30 sees). The measurement on the impedance meter should not be lower than 330 Ohms at
1KHz.