Cisco Systems AS5850 manual Power Module Safety Features 2400W AC-Input Power Shelf

Chapter 1 Cisco AS5850 Product Overview

Field-Replaceable Units

maintenance bus (Mbus), which monitors voltage tolerance levels, temperature conditions, and power failure in the enhanced AC-input power shelf. A grounding cable provides a ground connection from the 2400W AC-input power shelf to the chassis.

Figure 1-12shows a rear view of a 2400W AC-input power shelf before installation.

Figure 1-12 Cisco AS5850 2400W AC-Input Power Shelf—Rear View

-NEG (BLACK)
SIDE A	J10	-NEG (BLACK)
+POS (RED)		SIDE A
		+POS (RED)

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For detailed specification tables, refer to Appendix A, “Cisco AS5850 Specifications.”

Power Module Safety Features (2400W AC-Input Power Shelf)

The power modules in the enhanced 2400W AC-input power shelf have the following safety features:

•AC power modules installed in the enhanced AC-input power shelf are protected against overcurrent by circuit breakers, and against overtemperature by internal protection circuits.

•A spring-clip locking mechanism in the ejector lever/handles holds individual AC power modules in place, and prevents the power module from vibrating or sliding out of the power bay and dislodging from the power backplane. A small flat-blade screwdriver is needed to delatch the AC modules. Pulling on the handles without properly releasing the latches can damage the modules.

•Double grounding lugs (as per NEBS requirements) on both the enhanced AC-input power shelf and the chassis provide electrical grounding.

•The power modules are self-monitoring. Each power module monitors its own temperature and internal voltages. An internal fan in each power module draws cooling air from the front of the power shelf, through the power module, and out the rear of the power shelf. The power module airflow is separate from the rest of the Cisco AS5850 components.

Internal monitoring data is passed to the chassis through the maintenance bus (Mbus) monitoring system. You can view this data through a terminal connected to the RSC console port. The command to display the monitoring information is described in the Cisco AS5850 Universal Gateway Operation, Administration, Maintenance, and Provisioning Guide, available online at: http://www.cisco.com/univercd/cc/td/doc/product/access/acs_serv/as5850/sw_conf/5850oamp/ index.htm

	Cisco AS5850 Universal Gateway Hardware Installation Guide
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