PAD-3 SIEMENS
PAD-3 Siemens Power Expander
The Model PAD-3 Siemens from Siemens Building Technologies, Inc. is a notification and auxiliary power expander that provides up to 6 amps of 24 volt DC for powering notification appliances and auxiliary devices. The PAD-3 provides its own AC power connection, battery charging circuit, and battery connections. Used with a fire alarm control unit, this enables you to connect and distribute power to many more devices than your control unit may normally allow.
The PAD-3 Siemens has two optically isolated inputs that provide the connection from the fire alarm control unit notification appliance circuit to the PAD-3. The inputs also provide a connection for returning a trouble condition to the control unit notification appliance circuit.
The fire alarm control unit supervises its notification appliance circuit used for communicating with the PAD-3 the same way it supervises ordinary NACs. The inputs on the PAD-3 monitor the polarity of the voltage coming from the fire alarm control unit’s NACs to determine when to operate the notification appliance circuit outputs. The PAD-3 emulates the trouble behavior of a NAC by opening the EOL supervision current for trouble conditions. Note that the PAD-3 will sense the polarity of the fire alarm control unit’s NACs to drive the outputs whether or not the supervision connection is intact.
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