Installation Instructions IM584000300
Spec. No. 584000300 (Model 4015-X003) Issue AB, April 3, 2013
Chapter 3. Making Electrical Connections Page 35
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IB2 (ACU+ Controller Interface Board) Connections (if required) The IB2 (ACU+ Controller Interface Board) provides connection points for digital inputs,
programmable relay outputs, and temperature probes. The IB2 interface board is
accessed from the front of the power and control sub-rack. Loosen the two captive
fasteners and slide the tray the IB2 assembly is mounted to out far enough to make the
electrical connections. Refer to Figure 3-14.
When connecting input and output wires to the IB2 board, route the leads through the
opening provided on the top of the power and control sub-rack for I/O wiring (see Figure
3-14), through the I/O wiring cable tray, and out to the IB2 assembly at the front of the
system.
Note: The IB2 board is isolated from the system’s 400VDC bus and the internal 48V
bias supplies. If a voltage potential is required to be connected to digital inputs
and/or relay contacts, customer must supply the voltage source.
Digital Inputs and Programmable Relay Outputs
Digital input and relay output leads are connected to screw-type terminal blocks located
on the IB2. Recommended torque for these connections is 2.2 in-lbs (0.25 Nm). Refer to
Table 3-1 and Table 3-2 for pin-out information.
Digital Inputs
Connect up to eight (8) digital inputs to the IB2 (ACU+ Controller Interface Board). Note
that you must supply both paths for the digital input (either a positive or negative signal
and the opposite polarity return path). Observe proper polarity. Refer to Figure 3-14 for
terminal locations and Table 3-1 for pin-out information.
The digital inputs can be programmed to provide an alarm when the signal is applied
(HIGH) or removed (LOW). Refer to the ACU+ Controller Operation Instructions
(UM1M820NNB-1) for programming information.
Digital Input Ratings: Refer to the following.
a) Maximum Voltage Rating: 60V DC.
b) Active High: > 19V DC.
c) Active Low: < 1V DC.
Programmable Relay Outputs
The IB2 provides eight programmable alarm relays with dry Form-C contacts. Refer to
the ACU+ Controller Operation Instructions (UM1M820NNB-1) for programming
information. Connect up to eight (8) relay outputs to the IB2. Refer to Figure 3-14 for
terminal locations and Table 3-2 for pin-out information.
Relay Ratings: Refer to the following.
a) 1A Steady State @ 30V DC.
b) 3A Peak @ 30V DC.