Eaton 9EHD-33-40/20, User'S Installation And Operation Manual

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7 2 relay Card-mS
Two types of interfaces via a DB9 connector are available with this card. Dry contact mode
provides a simple way to transmit UPS information to an alarm system, PLC, or computer
system via dry relay contacts. By default the transmitted information is load powered, load on
bypass, load on battery, load on utility, battery fault, and low battery. RS232 mode provides an
RS232 interface for connection to a PC or to a UPS Control display unit. Jumpers are used to
select the interface (contacts or RS232).
figure 7-2 relay Card-mS
7 3 Building alarm monitoring
This standard feature lets you connect the UPS to your building alarms, such as smoke detectors or
overtemperature alarms. The customer interface terminals for external connections are located inside the UPS.
Use twisted-pair wires for each alarm input and common, refer Figure 4-9.The building alarms can be
programmed to display the alarm functional name.
Eaton 9EHD UPS (20-40 kVA, 380/400/415V) Installation and Operation Manual 73