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3.7
Input Circuits
The SKE-450 has two command input circuits (CMD1 & CMD2). The command input
circuits are used to activate the amplifier that transmits the audio signal over the output
speakers.
3.7.1
CMD1 Input Circuit
This section describes how to connect Class B (Style Y) or Class A (Style Z) inputs to CMD1
terminals. CMD1 input circuit rating is 12 to 30 VDC @ 50 mA. CMD1 is a polarity reverse
input to activate and supervise the SKE-450
3.7.1.1
Class B (Style Y)
Figure 3-10 illustrates how to wire a Class B (Style Y) input circuit to CMD1 input.
If a trouble condition
exists on the SKE-450,
the supervision circuit is
opened in addition to
energizing the trouble
relay causing a trouble at
the FACP.
Figure 3-10 Class B (Style Y) CMD1 Input Circuit Configuration
151267
Supervised
Power Limited
firealarmresources.com
4.7 kΩ EOL
UL Listed
Model 7626
Note: The 4.7 kΩ EOL
is typically used with
Silent Knight Controls.
Check the Installations
Manual of the FACP
you are using to
determine EOL value.
Installation
3-13
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