Emerson EXD-TEVI User Manual

Operating instructions
EXD-TEVI Economizer Controller with
ModBus Communication Capability
Emerson Climate Technologies GmbH www.emersonclimate.eu 1/3
Holzhauser Straße 180 I 13509 Berlin I Germany Date: 19.08.2014 EXD-TEVI_OI_EN_R02_865908.docx
General information:
EXD-TEVI is a stand-alone controller for enhanced wet vapor injection in
heating applications for Copeland tandem Scroll compressors.
Notes: Another controller (like EC3-X33) must be used for main superheat control.
For ModBus communication, protocol and bus topology please see technical bulletin
of EXD-TEVI (www.emersonclimate.eu).
Safety instructions:
• Read operating instructions thoroughly. Failure to comply can result in
device failure, system damage or personal injury.
• According to EN 13313 it is intended for use by persons having the
appropriate knowledge and skill.
• Before installation or service disconnect all voltages from system and device.
• Do not operate system before all cable connections are completed.
• Entire electrical connections have to comply with local regulations.
Installation:
The EXD-TEVI is designed to be mounted on a standard DIN rail.
Electrical installation:
• Refer to the electrical wiring diagram for electrical connections.
• Important: Keep controller and sensor wiring well separated from mains wiring.
Minimum recommended distance 30mm.
• EXM-125 and EXL-125 coils are supplied with fix cable and JST terminal block
at cable end. Cut the wires close to terminal block. Remove the wire insulation
approximately 7mm at the end. It is recommended to protect wire ends with
ferrules.
• Color codes for connection of EXM/EXL and pressure sensor PT5:
• EXM/L BR: Brown; BL: Blue; OR: Orange; YE: Yellow; WH: White
• PT5 BN: Brown; WH: White
Digital inputs DI1 and DI2
The digital inputs DI1 + DI2 are the interface between EXD-TEVI and system
controller if the Modbus communication has not been used. The digital status is
dependent to operation of system’s compressor/demand.
Operating condition Digital input status
Compressor starts Closed (Start)
Compressor stops Open (Stop)
Wiring:
Warnings:
• Use a class II category transformer for 24VAC power supply.
• Do not ground the 24VAC lines.
• Connecting any inputs to mains voltage will permanently damage the EXD-
TEVI.
We recommend using individual transformers for EXD-TEVI controller and any
3
rd
party controllers to avoid possible interference or grounding problems in the
power supply.
Lower Board Upper Board
Notes:
* 86kΩ NTC Discharge Temperature sensors, see Copeland documentation
Alarm relay, dry contact. Relay coil is not energized during alarm condition or
power off.
Display/keypad unit (LEDs and button functions):
ON
: Data display
ON
: alarm
OFF: no alarm
ON
: ModBus
communication
Next
parameter/
value
(higher)
Next
parameter/
value
(lower)
Selecting/
confirming
Parameters setting/saving
Blinking:
valve is opening
ON: valve is fully open
Blinking:
valve is closing
ON: valve is fully close
!
Библиотека СОК 

Emerson EXD-TEVI Specifications

General

Communication	RS-485
Protocols	Modbus RTU
Enclosure	IP20
Mounting	DIN Rail
Power supply	24 VAC/DC
Output Type	PWM

Summary

Display and Keypad Functions

Digital Inputs DI1 and DI2

Interface for system controller when Modbus is not used. Digital status depends on operation.

Wiring and Power Supply

Guidelines for 24VAC power supply, grounding, and recommended transformer usage.

Startup Preparation and Parameter Setup

Preparation for Start-up

Procedures for vacuuming and ensuring valve closure before refrigerant charging.

Setup of Parameters

Initial checks and readiness for startup after setting main parameters.

Parameter Modification Procedure

Step-by-step guide to access, modify, and save controller parameters using the keypad.

List of Parameters

Detailed list of configurable parameters with codes, descriptions, and default values.

Control (Valve) Start-up Behavior

Configuration of valve opening percentage and duration for startup.

System Parameter Display and Alarm Handling

Display System Parameters

How to view different data points like pressure, temperatures, and valve opening on the display.

Manual Alarm Reset

Procedure to reset functional alarms, excluding hardware errors, using keypad buttons.

Data Upload and Download

Upload/Download Key Function

Using the upload/download key to transfer configured parameters between controllers.

Uploading Parameters

Storing configured parameters from a reference controller onto the upload/download key.

Downloading Parameters

Transferring stored parameters from the key to a new controller.

Error and Alarm Handling

Error/Alarm Codes and Actions

Table detailing alarm codes, descriptions, relay actions, valve status, and recommended troubleshooting steps.

Technical Specifications

Technical Data Summary

Key technical specifications including power, protection, inputs, sensors, and output relay ratings.

Dimensions

Physical dimensions of the EXD-TEVI controller in millimeters.