Vertiv Liebert XD Series, System Design Manual

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7.7 Liebert XDP Warnings
LOSS OF POWER
—Activated when the unit is On and operational and 24VAC power to the control is lost.
This alarm will be emitted when power is restored to the control. The Liebert XDP will restart at a user-
defined time delay after power is restored. Once activated, the alarm will remain activated for 30 minutes.
PUMP 1 HRS EXCEED
—Activated when the Pump 1 Actual Hours exceeds the user-specified limit. To
reset, Actual Hours must be reset to 0.
PUMP 2 HRS EXCEED
—Activated when the Pump 2 Actual Hours exceeds the user-specified limit. To
reset, Actual Hours must be reset to 0.
7.8 CANbus Communications
A Controller Area Network (CAN) is a specialized internal communication network. It allows a Liebert XDP,
Liebert XDC and Liebert XD Smart Modules to communicate without a host computer. Networking the
Liebert XDP or Liebert XDC to Smart Modules enables the Smart Modules to be controlled and monitored
from the Liebert XDP or Liebert XDC.
Figure 7.6 below shows a typical Liebert XD system in a CANbus network. Liebert XD Smart Modules
should be connected to the Liebert XDP or Liebert XDC that supplies the modules with refrigerant.
Figure 7.6 Liebert XD system with CANbus
NOTE: Only six Liebert XDV10S* are shown. A maximum of 16 Liebert XDV10S*, a maximum of 20 Liebert
XDV8S*, maximum of eight single-circuited Liebert XDH20S*, five single-circuited Liebert XDH32S*,
maximum of eight Liebert XDO20S*, or a maximum of 10 Liebert XDO16S* can be connected together on
a single CANbus.
Plan wiring runs for Unit-to-Module (U2M) communication when designing the layout of the conditioned
space. In addition to general good wiring practices, take into account:
• Keep control and communication cables away from power cables to prevent electromagnetic
interference.
• Do not bend cables to less than four times the diameter of the cable.
• Do not deform cables when securing in bundles or when hanging them.
• Keep cables away from devices that can introduce noise into them, such as machines,
fluorescentlights, and electronics.
• Avoid stretching cables-tension when pulling cables should not exceed 25 pounds (11kg).
• Do not secure cables with any method that might damage them; use approved hangers, such
as those used for telephone wire and RG-6 coaxial wire; available at most hardware stores.
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