Chapter 4, System Operation

Table Of Contents

System Operation

4.1  System Commissioning

4.2  General Information

4.2.1  Alarm Interface Board and Connections

4.2.2  Basic Controller Functions

System Operation

4.1  System Commissioning

The following section should be used to power-up the system for the first time.

Step 1 Turn on AC breakers at the AC distribution panel to power up the shelf through the rectifiers.

Step 2 The controller and rectifier LEDs will start to blink. It may take a few minutes for the controller to communicate with all rectifiers.

Step 3 The system is now commissioned. If the controller RED LED s on, refer to " Chapter 5, "System Troubleshooting."

4.2  General Information

The Power Control System (XCS) ( Figure 4-1) is a supervisory system that is designed to control AC/DC power systems that are based on XR1648 rectifier modules.

Communication is accomplished through an alarm interface board and a backplane that connects to the rectifier modules.

Figure 4-1 System Control Unit

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)

4.2.2  Basic 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.

Step 3 During this recognition time the controller may report module-related alarms and the red LED on the rectifier may turn on. These alarms are caused by imbalances related to load sharing of the rectifiers (the new rectifier's output voltage is different than the existing rectifiers).

Step 4 The rectifier module will take a few minutes to step up to the correct voltage. At this point the controller will locate and adjust the rectifier module voltage to the correct output voltage and any alarms will be extinguished.

Step 5 To shorten the time that is needed to find new modules, the controller can be powered down and then powered up. This will cause the system to search for new modules faster. This is only recommended as a solution if it is important to shorten the time required for searching for new modules.

4.2.2.3  Remove Modules

Physically removing a module from the system creates a communication error indicated by the yellow LED on the controller. The yellow LED will remain on until a rectifier is installed.