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4.10
User Interface Board
The User-Interface Board (UIB) provides an interface for connecting the PDU to external monitoring and control
equipment. The main features of this board include the following items. (Also see Figure 4.4.1 below.)
1.
Alarm relay contacts (Form C)
Alarm designation
Summary alarm
Unacknowledged events
Default settings
NO = Normally Open (when relay coil is de-energized)
NC = Normally Closed (when relay coil is de-energized)
CFA = Closed for Alarm
OFA = Open for Alarm
2.
Remote Emergency Power Off (REPO) user input
Closing the circuit between J8-11 and J8-12 forces a shunt-trip on the input breaker. (For use with
isolated dry contacts.)
3.
Ethernet connection
J7 (RJ-45 connecter) is for an Ethernet connection to the PDU. For cybersecurity compliance and list of
open ports, refer to TruFit User's Manual.
4. RS-485 (Modbus-RTU) connection
The 5-point terminal block, J3, is for an RS-485 (Modbus-RTU) connection. It can be connected to a
building monitoring system.
Refer to Modbus section in PowerView manual 94-1100-00002861 for more details.
All field wiring connections are made via pluggable screw terminals, rated for solid or stranded wiring sized #12
to #22AWG.
Terminals (J12)
1 – 3
2 – 3
4 – 6
5 – 6
®
TruFit
Power Distribution Unit│94-1100-00002873 A0 EN 29/34
Installation Guide
Contact type
NO/CFA
NO/OFA
NO/CFA
NO/OFA
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