EC3-X32 Stand-alone Superheat Controller Technical Data EC3-X32 is a stand-alone universal superheat controller for air conditioning, refrigeration and industrial applications such as chillers, industrial process cooling, rooftops, heat pumps, package unit, close control, cold room, food process and air driers. EC3-X32 offers remote access with built-in TCP/IP Ethernet communications and WebServer functionality. Any ® standard WebBrowser (e.g. Internet Explorer 5.0 or higher or Mozilla Firefox) can be used for monitoring or parameter setting. Features EC3-X32 Superheat control in conjunction with Emerson stepper motor driven Electrical Control Valves (EX4 … EX8) Limitation of evaporating pressure (MOP) Low and high superheat alarm Low pressure switch function/alarm Freeze protection function/alarm Pump down function Feed through of 4…20mA signal from evaporator pressure sensor to analogue output. This may also be connected to pressure input of any other controller to avoid need for multiple pressure sensors Monitoring of sensors and sensor wiring and detection of sensor and wiring failures Intelligent alarm management in order to protect the compressor i.e fail safe operation Integral rechargeable battery to close Electrical Control Valve in case of power loss Support of TCP/IP Ethernet technology with WebServer functionality allows monitoring and configuration of controllers through a standard WebBrowser (e.g. Internet ® Explorer or Mozilla Firefox) Electrical connection via plug-in type screw terminal Aluminum housing for DIN rail mounting EC3-X32 Typical ordering package: Description Type Superheat Controller EC3-X32 Terminal kit K03-X32 Temperature sensor ECN-N60 Electrical Control Valve EX4, EX5, EX6, EX7 or EX8 * Pressure sensor - for R-22/R-124/R-134a/R-404A/R-407C/R-507C PT5-07M - for R-410A PT5-18M - for R-744 (transcritical) PT4-30M Plug and cable assembly for pressure sensor PT4-M60 Replacement Battery for EC3 *For further details refer to: EX4, EX5, EX6, EX7, EX8 Electrical Control Valves datasheet Emerson PCN 097708 097709 097714 * Part No. 807 782 807 644 804 497 * 097748 802 350 097749 802 851 097728 802 334 097717 804 805 097693 807 790 FC-TD/ EX4-8 Application EC3-X32 as superheat controller can be applied for the following: Superheat control of conventional evaporators such as shell and tube, plate heat exchanger, air coil etc. Superheat control of subcoolers or economizers connected to suction pressure of compressor or intermediate pressure of screw/scroll compressors having vapor or liquid injection connection Superheat control of intermediate gas in two stage compressors Superheat control of suction gas in conjunction with hot gas bypass Superheat control of flooded evaporators FC-TD/ EC3-X32 1/9 July 2011 EC3-X32 Stand-alone Superheat Controller Description of performance The EC3-X32 controls the opening of an electrical control valve according to desired superheat. As Emerson Electrical Control Valves (ECV) are able to provide a positive shut-off function better than conventional solenoid valves, there will be no flow through Emerson ECV as long as the compressor is not running. In the event of cooling request and compressor startup, EC3-X32 needs to be informed. This can be achieved by a digital input. EC3-X32 will start to control the refrigerant mass flow stand alone by precise positioning of the ECV under different operating conditions such as compressor start-up, start of further compressor, high head pressure, low head pressure, high load, low load and partial load operation. EC3-X32 is capable for diagnostics and alarm. The alarm can be received via relay output, via TCP/IP network as well as optical LED/alarm code on ECD-002. Algorithm The superheat control algorithm is self-adapting so that it automatically adjusts itself to the characteristics of the evaporator at regular intervals. This guarantees optimal superheat control performance for different types of evaporators, as well as when the operating conditions of the evaporator change over time. Superheat Control function By receiving two measured values from Emerson pressure sensor PT4 and Emerson temperature sensor ECN-N60, EC3X32 calculates the actual superheat and compares to preset superheat. EC3-X32 operates the Electrical Control Valve in order to keep superheat at desired setpoint under various operating conditions. The superheat set point is adjustable between 6°F and 60°F. If low superheat alarm function is disabled, it is possible to adjust the superheat set point below 6°F down to 1°F for special applications such as flooded evaporators. MOP function To avoid overload of the compressor motor, the MOP function of the EC3-X32 limits the evaporating pressure to a predetermined value. That can be adjusted to match the safe operating envelope of the compressor. MOP setpoints are entered as saturation temperature values to match published safe operating data of compressor manufacturers and to avoid unnecessary manual conversions from temperature into pressure values. The MOP function may be totally disabled, when not needed. Digital input status (factory setting) The digital input is the interface between EC3-X32 and system controller. The digital status depends on the system’s compressor/thermostat. Commander Operating condition Digital input status Compressor Compressor starts Closed / 24V (Start) Compressor stops Open / 0V (Stop) Thermostat Demand (compressor Closed / 24V (Start) must be ON) No demand Open / 0V (Stop) Shut-off function When digital input is open (0V), the EC3-X32 will drive the electrical control valve to the closed position. Due to the positive shut-off capabilities of the EX4/5/6/7/8 valves a, separate liquid line solenoid valve is not required. The shut-off function is guaranteed in case of power loss due to built-in internal battery. Analogue output (4-20mA signal) function EC3-X32 requires the outlet pressure level of the evaporator for superheat and MOP control. The output signal from PT4 is used by EC3-X32 and again provided as 4 to 20mA signal (galvanized) for connection to any other third party controller, which can receive a 4 to 20 mA signal. Please see the wiring diagram for more details. If the system controller does not have capability of using this signal, the terminal will not be wired to any other device. Pump down function When the pump-down function is active, the electrical control valve will close in event of no demand i.e. the digital is 0V (open), but the compressor will keep running to perform a pump down of the refrigeration system until the pump-down threshold pressure (adjustable) is reached and after a time delay (adjustable), the output pump down relay trips to stop the compressor. This relay must be wired into the compressor control wiring. Low pressure switch function/alarm The use of a low-pressure switch is very common to prevent the compressor from running in event of a refrigerant charge loss and alarm. When the low pressure function is active, a software routine detects excessively low pressure level (adjustable) and after a time delay (adjustable) output alarm relay trips. Low superheat alarm Liquid flooding may lead to serious damage of compressors and must be avoided. The built-in low superheat alarm function of the EC3-X32 detects low superheat conditions and deactivates the alarm relay. If the alarm relay is wired into the serial safety loop, the compressor will be switched off when a low superheat alarm occurs. Freeze protection function/alarm This feature permits the elimination of a separate freeze protection thermostat, in a water chiller application. When the freeze protection function is activated, the evaporating temperature is constantly monitored. If it drops below the freeze protection threshold, the freeze protection alarm triggers the alarm relay. High superheat alarm If this function is enabled, it detects longer lasting high superheat conditions (adjustable) and triggers the high superheat alarm. Safety / internal battery function In the event of a power failure to the entire system, a stepper motor driven valve would not be able to move. Due to the differential pressure between condenser and evaporator, the refrigerant would continue to flow through the valve if the valve is open. The compressor must be protected after power recovery against flood-back. The EC3-X32 contains an internal rechargeable battery and smart battery charge control. Optimum battery life is achieved through temperature compensated charge cycles. FC-TD/ EC3-X32 2/9 July 2011 EC3-X32 Stand-alone Superheat Controller Alarm and maintenance functions EC3-X32 provides several alarms to facilitate diagnosis as well as shut down of compressor/system if alarm relay is wired into the serial safety loop. Built-in diagnostic routines constantly monitor the battery health and sensors the Electrical Control Valve and the associated wiring for open and short circuits. When such errors are detected, the controller goes into an alarm condition and closes the valve. In addition to hardware errors, the EC3-X32 will monitor the minimum operating superheat. If the superheat drops below 1°F for a continuous period of one minute, the low superheat alarm will occur. The low superheat alarm can be disabled for applications such as a flooded evaporator, where a lower operating superheat is required. There are several other alarms such as a low pressure alarm, freeze protection alarm and high superheat alarm if they are enabled. In the case of an alarm, EC3-X32 will close the valve and the alarm relay will be deactivated. All alarms are automatically cleared after correction. Battery alarm, low superheat alarm, freeze protection alarm and low pressure alarm can be modified for manual reset. Emerson temperature sensor ECN-N60 function The temperature sensor measures the refrigerant temperature at the outlet of the evaporator. It is important to use only this particular temperature sensor because the ECN-N60 has the right performance such as desired time constant and tolerance compensation within the specific working range. The use of other temperature sensors is not recommended/released. The sensor is hermetically sealed for high reliability and long life. The sensor has metal housings for optimal thermal conductivity. Alarm relay function (factory setting) Alarm relay contains a SPDT contact. If the relay is wired to the system controller, it is possible to stop the compressor/system. The alarm relay is activated during normal operation and deactivated during alarm conditions such as supply power interruption. List of adjustable parameters Superheat set point and mode Low superheat function MOP function and set point Type of refrigerant and required pressure sensor Type of Electrical Control Valve Valve start opening and duration Unit conversion Value to display Battery error management Password User name (only via web page) Low pressure alarm: cut-out/cut-in and time delay Freeze protection alarm: cut-out/cut-in and time delay High superheat alarm: Cut-out and time delay Pump down cut-out and duration Manual control of valve (only via web page) TCP/IP configuration (only via web page) Others Start-up configuration function Built-in valve opening (%) at start-up for certain period of time helps the compressor’s start-up and prevents erratic low pressure cut-out for the following cases: Operation of systems with air cooled condenser in low ambient temperatures Compressor start-up after long period standby time in low ambient environment Start-up of very large single stage compressor capacity Emerson Pressure Sensor PT4 function The pressure sensor measures the saturation pressure at the outlet of the evaporator. The output signal is 4 to 20 mA corresponding to a pressure range. Based on the type of refrigerant and system, different types of pressure sensors are needed. PT4-07M for evaporators operating with R-22/R-124/R134a/R-404A/R-407C refrigerants PT4-18M for evaporators operating with R-410A refrigerant PT4-30M for evaporators operating with R-744 refrigerant Every type of pressure sensor is calibrated in a temperature range for the above specified applications. The feature set and performance of the PT4 Series is a perfect match for the EC3X32. Other pressure sensors are not released for use with EC3-X32 and when applied, may lead to poor performance. FC-TD/ EC3-X32 Setting and visualizing Data via WebPages The EC3-X32 has a TCP/IP Ethernet communication interface enabling the controller to be directly connected to a network or a PC via the standard Ethernet port. The EC3-X32 controller has embedded WebPages to enable the user to visualize the parameter lists using real text labels. To view WebPages on the PC, a standard WebBrowser like Internet Explorer® or Mozilla Firefox and JRE Java Runtime Environment is needed. JRE can be downloaded at no charge from the Emerson website. WebServer function of the EC3-X32 with TCP/IP Ethernet networking capabilities All relevant parameters and modes are visible on a single WebPage simultaneously. For more details on the setup and maintenance click on the screen tab that correlates to the specific task. The next page shows the homepage of an EC3X32 with the monitoring WebPage of the controller. EC3-X32 features multi-language WebPages. Two languages are always available in the controller. English is the default language. 3/9 July 2008 EC3-X32 Stand-alone Superheat Controller Examples for Webpages: The top fields indicate the status of the controller. When alarms occur, they will be shown in red. The fields below show temperature and pressure of all sensors attached to the controller as well as the superheat setpoint, the measured superheat and the valve opening. The evaporator status field on the right hand side shows the operating modes. The active mode is shown in blue. All WebPages that allow the change of controller parameters are password protected. Below is the example for the superheat configuration WebPage of an EC3-X32 Controller. The setpoints for superheat, low and high super-heat alarms as well as the refrigerant and the Electrical Control Valve selected can be easily reviewed and modified if needed: F F F sec. F FC-TD/ EC3-X32 4/9 July 2008 EC3-X32 Stand-alone Superheat Controller Alarms The monitoring WebPage shows all alarms in text form. All possible alarm messages are visible, active alarms are highlighted red, see below: Service Functions Particularly useful facilities are the service functions, which enable the engineer to manually control the system during commissioning. They include manual operation of the Electrical Control Valve, clearing alarms which require a manual reset and resetting the controller to factory default settings. A logfile can be stored on the PC. The file format of the datalog is text with semicolon (;) separated fields. On the picture below is a sample log file from an EC3-X32 imported in Microsoft ® Excel : Optional ECD-002 display/keypad unit The ECD-002 can be used as optional for service purposes. ECD-002 may be connected or removed from EC3-X32 at any time. The display unit can be switched from K/bar/°C to R/psig/°F. Indicator LEDs show the status of valve opening, valve closing, demand and alarm. A rolling graph with superheat, evaporating pressure, evaporating temperature, valve opening and coil out temperature data over a period of approximately 10 minutes can be displayed: FC-TD/ EC3-X32 5/9 July 2008 EC3-X32 Stand-alone Superheat Controller Wiring Diagram Permanent Temporary for set-up, start-up and service Direct connection via cross over cable Connection via Router A: White wire B: Black wire C: Blue wire D: Brown wire E: Plug cable assembly EX5-Nxx for connection to EX4/EX5/EX6/EX7/EX8 F: Remote control panel, system controller G: Alarm relay, dry contact. Relay coil is not energized at alarm condition or power off H: Digital input (0V/open = Stop; 24V/closed = Start) I: Transformer Class II, 24VAC secondary / 28VA FC-TD/ EC3-X32 J: Third party controller (can use the analog output signal from EC3) Note: The internal resistor of third party controller must fulfill the following conditions: R ≤ 200 Ω if the supply voltage is 12VDC R ≤ 800 Ω if the supply voltage is 24VDC 6/9 July 2008 EC3-X32 Stand-alone Superheat Controller Ordering Description Controller EC3-X32 Terminal Kit for EC3-X32 Pressure Sensors -11.6…101.5 psi 0 … 261.1psi 0 … 435.1 psi 20 ft cable length 20 ft cable length Cable Assembly for PT4 NTC Temperature sensors Display/keypad unit (opt.) Connection cable EC3 to ECD-002 10 ft Emerson PCN 097708 097709 097715 097716 097728 097717 097714 097712 097713 Type EC3-X32 K03-X32 PT4-07M PT4-18M PT4-30M PT4-M60 ECN-N60 ECD-002 ECC-N30 Part Code Nr. 807 782 807 644 802 332 802 333 802 334 804 805 804 497 807 657 807 861 Ordering, accessories, spare part Transformer Primary:120/208/240VAC 60HZ Secondary: 24V 40VA Emerson PCN 097724 Type Part Code Nr. T2 90-T40F3 Suitable valves for connection to EC3-X32 Valve Capacity range Tons * EX4 EX5 EX6 EX7 EX8 0.6 … 5.7 1.4 … 14.2 3.4 … 34.1 10 … 93.8 25.6 … 250.2 EX4 EX5 EX6 EX7 EX8 0.6 … 6 1.4 … 15.1 3.7 … 35.8 10 … 98.7 28.4 … 263 EX4 EX5 EX6 EX7 EX8 0.6 … 4.3 1.1 … 11.1 2.8 … 26.4 7.1 … 72.5 19.9 … 193.4 EX4 EX5 EX6 EX7 EX8 0.6 … 4 1.1 … 10 2.6 … 23.9 6.8 … 65.4 17.6 … 174.3 FC-TD/ EC3-X32 Valve Capacity range Tons * R-22 EX4 EX5 EX6 EX7 EX8** 0.9 … 6.5 1.7 … 16.5 4 … 39.8 11.4 … 109.5 28.4 … 292 R-407C EX4 EX5 EX6 EX7 EX8** 1.1 … 11.7 2.8… 29 7.1… 69.4 19.9 … 109.8 51.2 … 508.7 EX4 EX5 EX6 0.3 … 3.1 0.9 … 8 1.7 … 19.1 Refrigerant Capacity regulation 10-100% R-134a *) Nominal rating conditions: Refrigerant R-404A/ R-507 R-22, R-134a, R-404A, R-407C, R-410A R-23 R-124 **) MWP: 508 psi 7/9 Refrigerant Capacity regulation R-410A R-744 10 to 100% R-124 Evaporating temperature Condensing temperature +39.2°F +100.4°F -76°F +68°F -13°F +176°F July 2008 EC3-X32 Stand-alone Superheat Controller Technical Data EC3-X32 ECD-002 Display Unit Supply voltage 24VAC ±10%, 50/60Hz Supply From EC3 Series Controller via connecting cable Digital input 24 V AC ±10%, 50-60HZ 24 V DC ±10% LED indicators Valve opening, valve closing, alarm, demand Power consumption 25VA max. including connected ECV and display/keyboard Display LED Numeric segmental display, 2½digits, red, with automatic decimal point betw. ±19.9, switchable between °C and °F ECC-Nxx or standard CAT5 patch cord with RJ45 connectors Internal battery Approximately 2 hours if battery is fully charging time empty Plug-in connector size Removable screw version wire size 12-20 AWG Ground connection Applied directive EMC LVD RoHS 1/4 in spade earth connector Connecting cable Temperature storage operating Humidity -4 … +149°F +32 … +140°F 0 … 80% r.h. non condensing Protection class IP 65 (front protection with gasket) Marking EN 61326, EN 50081, EN 61000-6-2, EN 61000-4-2, EN 61000-4-3, EN 61000-4-4, EN 61000-4-5, EN 610004-6, EN 61000-4-11 CE Weight ~1.8 oz Protection class IP 20 Mounting Panel mount (2.8 x 1.1 in cutout) Vibration 4g, 10-1000Hz Temperature storage operating Humidity -4 … +149°F +32 … +140°F 0 … 80% r.h. non condensing Weight ~ 28.2 oz Mounting DIN rail mounted Input and Output, EC3-X32 Controller Description Temperature input Pressure sensor input Analog output (evaporating pressure feed-through signal) Digital input Output relay Stepper motor output Connection to ECD-002 TCP/IP connection FC-TD/ EC3-X32 Specification ECN-N60 10k @ +77 °F, Range: -58 … +122 °F PT4-07M/18M 24VDC, 4 20mA 4 … 20mA Requires 12 or 24 VDC 0/24 VAC/DC SPDT contacts, AgCdO , 24VAC/DC Inductive 2Amp, Resistive 8 Amp For EX4 … EX8 Electrical Control Valves RJ45 RJ45 8/9 July 2008 EC3-X32 Stand-alone Superheat Controller Physical Dimensions Drawings (in) EC3-X32 Controller ECD-002 Display Unit Emerson is not to be held responsible for erroneous literature regarding capacities, dimensions, applications, etc. stated herein. Products, specifications and data in this literature are subject to change without notice. The information given herein is based on technical data and tests which Emerson believes to be reliable and which are in compliance with technical knowledge of today. It is intended only for use by persons having the appropriate technical knowledge and skills, at their own discretion and risk. Since conditions of use are outside of Emerson control we can not assume any liability for results obtained or damages occurred due to improper application. This document replaces all earlier versions. www.emersonclimate.com/flowcontrols 11911 Adie Road P.O. Box 411400 St. Louis, MO 63141 USA FC-TD/ EC3-X32 CUSTOMER SERVICE (314)-569-4666 9/9 July 2008
* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project
advertisement