user manual

1-13
Cisco Physical Access Gateway User Guide
OL-20932-02
Chapter 1 Overview
Power Options and Requirements
Installing Surge Suppressors on Output Device Connections
Install a surge suppressor between all output devices and the Gateway, Reader, or Output modules to
protect the devices from power surges. Use one of the following methods:
• If the base on a lock device receives power from an external power source, install an isolation relay
between the output device and the Gateway, Reader, or Output module.
• Install a MOV (Metal Oxide Varistor) surge protection product, such as the Ditek DTK-ESS Electric
Switch Suppressor kit from Diversified Technology Group. An example installation is shown in
Figure 1-8. You can also use a diode 4N4001 for surge suppression.
Figure 1-8 Sample Surge Suppressor Installation
Connect Reader Devices with Module Power Off
Disconnect power from the Gateway or Reader module before connecting reader devices to the modules.
Connecting a reader device when the modules are powered can cause the Gateway or Reader module to
malfunction.
Cisco Access
Control Module
Surge
Suppressor
Surge
Suppressor
Power Source
Output Device
Terminal Strip
+-
+
-
277557