Kidde Fire Systems VEGA LT TM0081 User Manual
TM0081
Page 12 of 51
Issue 1.01
3.5.3
Sounder Circuit Wiring
Two programmable conventional sounder circuits are available on the control panel. Each circuit is rated at
1amp however it is recommended that the maximum total load shared between both circuits should not exceed
1amp. Each sounder circuit is monitored for open and short circuits. An end of line (EOL) 10 KΩ resistor 0.5W
minimum should be fitted after the last sounder attached to the circuit to allow the wiring to be monitored.
1amp however it is recommended that the maximum total load shared between both circuits should not exceed
1amp. Each sounder circuit is monitored for open and short circuits. An end of line (EOL) 10 KΩ resistor 0.5W
minimum should be fitted after the last sounder attached to the circuit to allow the wiring to be monitored.
All sounders must be polarised, as non-polarised sounders will signal a fault condition on the control panel.
Refer to figure 8. Each sounder therefore must have an integral blocking diode that prevents the sounder from
using power during normal monitoring. The polarity of the sounder output voltage is reversed when the sounder
circuit is operated allowing the sounders devices to operate.
Refer to figure 8. Each sounder therefore must have an integral blocking diode that prevents the sounder from
using power during normal monitoring. The polarity of the sounder output voltage is reversed when the sounder
circuit is operated allowing the sounders devices to operate.
Figure 8: Typical Polarised Sounder Circuit Wiring
Should non polarised alarm devices such as mechanical bells be connected to the system, then a diode will
have to be placed in line with the device to prevent faults occurring and to enable fault monitoring. A
suppression diode will also be required across the device. Refer to Figure 9.
have to be placed in line with the device to prevent faults occurring and to enable fault monitoring. A
suppression diode will also be required across the device. Refer to Figure 9.
Figure 9: Typical Bell Circuit Wiring
The sounder circuit cable must be stripped in accordance with the manufacturer's guidelines and must be
secured to the enclosure using metal compression glands as shown in figure 7.
secured to the enclosure using metal compression glands as shown in figure 7.
3.5.4
Auxiliary Output Wiring
Auxiliary Fire Output
Two voltage free (dry contact) changeover contacts are provided which operate during any fire condition and
can be used for driving local fire fighting equipment such as sprinkler systems, door release systems and roller
shutter doors etc. Refer to Figure 10.
can be used for driving local fire fighting equipment such as sprinkler systems, door release systems and roller
shutter doors etc. Refer to Figure 10.
Figure 10: Typical Auxiliary Fire Output Wiring