APC ACRD200 Installation Manual download pdf (Page 22)

InRow RD Fluid Cooled Operation and Maintenance14

Availability. Redundancy (Backup Units), Runtime Balancing and Load Assist modes are only

supported in Spot, HACS and RACS configurations.

• Backup Units: The display will show the range of units assigned to the backup function, for

example: 1 - X. The cooling unit is not running but is ready to run if a unit fails, is unable to cool

or needs cooling assistance.

• Load Asst (Load Assist): Enabled/Disabled. The unit was previously in the Backup mode but is

now running due to a request for cooling assistance. When the assistance is no longer needed, the

unit will return to the Backup state. If a failure occurs on a cooling unit while the backup unit is

assisting, the backup unit will take over for the failed cooling unit.

• Runtm Bal (Runtime Balancing): Enabled/Disabled. The system will maintain similar runtimes

between units in the group. When the difference between the runtime hours of the cooling units in

the system exceeds 72 hours, the system will automatically exchange modes between the longest

running Primary cooling unit and the Backup with the least Runtime hours.

Note: The Runtime Balancing cap is not adjustable.

Runtime hours are hours that the cooling unit is actually

operating and NOT 72 consecutive hours (3 days) of time.

Identify the cooling unit

Path: Main > Set Identification

The Set Identification menu contains settings that identify the name and location of the cooling unit.

Name. Assign a Name of up to 40 alpha-numeric characters to this cooling unit.

Location. Enter the Location, up to 40 alpha-numeric characters, of the cooling unit.

Note: Only the first 19 characters (of the 40 that are possible to enter) will display on the

display interface. You must use Telnet, the Control console or the Web to access all 40

characters. See page 32 and page 33 for more information.

Configure Modbus

Path: Main > Configure Modbus

Use the Configure Modbus menu to set up communication between the cooling unit and the building

management system.

Modbus. Enable or Disable the Modbus communication protocol.

Target Id. Each Modbus device must have a unique target identification number. Enter a unique

number, from 1 to 247, for this cooling unit.

Baud Rate. Choose either 9600 bps or 19200 bps.

Fixed settings: 8 data bits, no parity, 1 stop bit. These settings cannot be modified.

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APC ACRD200 Installation Manual Page 22