Emerson E2 IMC/Prodigy Rooftop Unit Controllers, Board Installation, Control Techniques Drive

Use these formulas to determine if the wire gauge you are using fits within specification:

14 AWG:

Feet = 1920/VA

18AWG: Feet = 739/VA

(VA is the total VA rating of the I/O boards) For example, if you had an 80 VA load:

14AWG: 24 ft

18AWG: 9 ft (rounded down)

Figure 6-3- Power Wire Lengths

Sensors requiring 24VAC can be powered from the same transformer powering the input board as long as the resulting total load of both the input board(s) and the sen- sor(s) connected to the transformer does not exceed the transformer’s VA rating. Consult Section 6.1.9, Powering the I/O Boards, and Section 8.6.1, Powering Echelon Devices for more information.

6.1.10 Board Installation

The following pages give step-by-step graphical instructions on all steps necessary to install each I/O Net- work device so that it is powered up and able to communi- cate with E2. If these devices have not yet been mounted, refer to Section 3.2, Mounting I/O Boards for mounting instructions for these devices.

6.2IMC/Prodigy Rooftop Unit Controllers

All E2 Building Controller (BX) versions 2.21F01 and above may communicate with IMC/Prodigy rooftop units equipped with IMC/Prodigy control boards version M4-1 or higher. E2 controllers version 2.30F01 and above may use any of the RS485 I/O ports (COM2, COM4, or COM6) as a IMC/Prodigy communication port. Version 2.21F01 E2 units may only connect IMC/Prodigys to an RS485 Expansion Card. Connectivity to IMC/Prodigy is a licensed feature and must be purchased from Emerson Retail Solutions.

The IMC/Prodigy interface has its own technical bulle- tin explaining installation, network setup, and E2 configu- ration. Refer to Technical Bulletin 026-4117.

6.3MODBUS

E2 controllers version 2.30F01 or greater may select MODBUS as a network type. The E2 supports connection to certain MODBUS devices including but not limited to Control Link CD, Control Link RSC, Control Link ACC, XR, XM and XEV series controllers.

NOTE: The E2 always acts as the MODBUS Master. No other MODBUS Master devices may be on the same network as the E2.

6.3.1Control Techniques Drive

(VSD)

Using the MODBUS network type, E2 controllers can communicate with the Control Techniques variable-speed drive (VSD). There are three different VSD models the E2 communicates with: Commander SE, Commander SK, and Unidrive SP drive types.

Note that all CT drives are 2 stop bits, with no parity. Since ECT MODBUS specifies 1 stop bit, CT drives will configure the General Services setting for stop bits and always communicate with the drives using 2 stop bits. The E2 calculates the difference and adjusts for the additional stop bit.

Configure the COM port the CT drive will connect to by pressing Alt + M to open the serial configuration man- ager. Set the COM port to MODBUS and the baud rate (match the baud rate on the CT drive). For more informa- tion on setting up serial ports, go to Section 5, Serial Con- figuration.

The Control Techniques VSD has its own technical bulletin that explains interfacing with E2 (P/N 026-4122). The installation and operation manual explaining the VSD is maintained by Control Techniques. Contact your Con- trol Techniques representative for a copy of this manual.

6-6 • E2 RX/BX/CX I&O Manual 026-1614 Rev 4 5-JAN-2013