Cisco Systems 124778, 124792 Alarm Interface Board and Connections, Basic Controller Functions

Chapter 4 System Operation

4.2.1 Alarm Interface Board and Connections

4.2.1 Alarm Interface Board and Connections

The alarm interface board is the main connection point for external communication inputs. The board is located inside the controller and can be accessed by removing the front controller cover and then sliding out the controller tray to expose the alarm connections (located on the right-hand side).

Alarm connections are made at the terminal block located on the Alarm/Interface PC board. The green connectors can be easily removed for ease in installing the wires into the connector; 22 AWG (0.34mm²) wire is recommended for connecting alarms to the alarm output terminals (Figure 2-21 on page 2-24). External connections are Form C relay which can be monitored either Normally Closed or Normally Open. The four alarms are numbered 1 through 4. (Refer to Table 2-6 on page 2-23).

Note All alarm connections are for the unpowered state. When the power is off the NC is normally closed and when the power is on, the NC is open.

The following is a list of alarm board connections including descriptions and cabling:

•Alarms - Up to four Form C alarm contacts for remote signaling

•Load fuse and breaker monitoring

•RS232 Interface - External communications port (not utilized in this application)

4.2.2Basic Controller Functions

The following section contains basic controller functions including starting the controller, adding modules, and removing modules from the system.

4.2.2.1 Start the Controller

When power is applied to the controller:

Step 1 The controller will spend several minutes analyzing the system and testing all addresses for connected rectifier modules. The green LED on the controller will blink. No alarms will be raised during this period.

Step 2 When the controller finds a module it will add it to the inventory.

4.2.2.2 Add Modules

When a rectifier is added to the system it will remain off until the controller detects it.

Step 1 When a rectifier is added to the system, its output voltage will walk-in, increasing up to its default setting. This will occur within 60 seconds.

Step 2 The controller constantly scans for new modules, but it may take a few minutes to recognize an inserted module.

Cisco AC/DC Power System User Guide, R1.0

4-2 May 2006