Emerson 4015 IB2 ACU+ Controller Interface Board Connections if required, Digital Inputs

Installation Instructions	IM584000300
Spec. No. 584000300 (Model 4015-X003)	Issue AB, April 3, 2013

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 3-1and Table 3-2for 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 3-14for terminal locations and Table 3-1for 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 3-14for terminal locations and Table 3-2for pin-out information.

Relay Ratings: Refer to the following.

a)1A Steady State @ 30V DC.

b)3A Peak @ 30V DC.

Chapter 3. Making Electrical Connections Page 35

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