Vertiv™ NetSure™ Control Unit (NCU) User Manual
9 NCU Digital Input and Relay Output Connections
9.1 NCU Digital Input Connections
The NCU provides four (4) digital inputs for alarms/events. Screw-pressure type connections are provided. Wire size range is 28
AWG to 16 AWG. Recommended torque for these connections is 0.19 N-m (1.7 in-lbs.). Refer to Figure 9.1 for connector location and
pin-outs.
Note that some digital inputs may be factory wired to the system.
9.2 NCU Relay Output Connections
The NCU provides four (4) sets of Form-C alarm relay dry contact outputs for connection of remote alarms. Relay contacts are rated
for 60 W: 2 A @ 30 VDC or 1 A @ 60 VDC. Screw-pressure type connections are provided. Wire size range is 28 AWG to16 AWG.
Recommended torque for these connections is 0.19 N-m (1.7 in-lbs.). Refer to Figure 9.1 for connector location and pin-outs.
Each relay is user configurable for alarm conditions. Alarm relay contacts can be connected to other monitoring equipment.
Note that some relay outputs may be factory wired to the system.
9.3 IB2 (Controller Interface Board) and EIB (Controller Extended Interface
Board)
One or more IB2 (Controller Interface Board) and/or EIB (Controller Extended Interface Board) may be connected to the NCU. The
IB2 and EIB provide additional digital inputs and relay outputs. Note that some digital inputs and/or relay outputs may be factory
wired to the system. Refer to your Power System documentation for IB2 and EIB connections and specifications.
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