Emerson 637 Technical Information download pdf

technical bulletin

Document Part # 026-4122 Rev 1 16-JUN-2008 Page 1 of 10

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Control Techniques Variable-Speed Drive

(VSD) Interface

Overview

The E2 RX, BX, and CX series of controllers features integration with several models of variable-speed drives

(VSDs) manufactured by Control Techniques, a division of Emerson Industrial Automation. The E2 communi-

cates with the VSD via an RS485 MODBUS network, which allows easier wiring setup and more detailed status

and fault information to be communicated to the E2 than traditional VSDs driven with I/O points.

All E2 control applications that can use VSDs — such as variable-speed condenser fans, AHU fans, and VS

compressors — support selection of Control Techniques drives, making software setup quicker and easier.

Cautions, Warnings, and Notices

Compatible Drives and E2 Versions

The E2 controller’s RS485 MODBUS interface communicates with the following Controller Techniques VSD

models:

• Commander SK - Requires E2 version 2.64F01 or above

• Commander SE - Requires E2 version 2.40F01 or above

• Unidrive SP - Requires E2 version 2.40F01 or above

Before Beginning Setup

The networking and configuration instructions in this technical bulletin assume the Control Techniques VSDs are

properly installed, tuned, and programmed by the installer. It is critical that the proper filters, wiring, shielding,

and grounding are done to minimize the EMI generated by these drives. The following is a list of items that must

be addressed to insure proper system operation. Refer to the drive manual on how to do the following:

1. Fitting the correct RFI filter(s) at the power input to the drive,

WARNING! If an E2 has Commander SK variable speed drives

configured, do NOT remotely upgrade this unit to 2.64F01 and

above if the current version is earlier than 2.64F01. The E2 will

lose communication with Commander SK drives when upgraded.

A technician must be on-site to clean out the Commander SK and

reprogram (follow the instructions in this document to program).

WARNING! Inhibit or disable the VSD before making program-

ming changes. Refer to the VSD’s manufacturer’s instructions

for information on inhibiting the drive.

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Summary of Contents

Page 1 - (VSD) Interface

Page 2 - VSD Input Wiring

Page 3 - MODBUS Networking

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Emerson 637 Technical Information

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