026-1206 Rev 3 13-DEC-2012 XEV22D Driver for Stepper Electronic Expansion Valves Installation and Operation Manual
Emerson Climate Technologies Retail Solutions 1065 Big Shanty Road NW, Suite 100 Kennesaw, GA 30144, USA Phone: 770-425-2724 Fax: 770-425-9319
Table of Contents 1 INTRODUCTION.......................................................................................................................................................... 1 1.1. GENERAL WARNING ..................................................................................................................................................... 1 2 OVERVIEW ...........................................................................................................................................
17 SPECIFICATIONS ................................................................................................................................................... 20 18 E2 MODBUS NETWORK WIRING ....................................................................................................................... 21 19 ECT MODBUS NETWORKING TO E2S............................................................................................................... 22 19.1. COM PORT ASSOCIATIONS - E2 VERSIONS 3.
1 Introduction 2 Overview 1.1. General Warning 2.1. General Description Please read the following safety precautions and warnings before using this manual: The XEV22D controller is capable of driving a wide variety of stepper electronic expansion valves. The controller regulates the superheat (SH) of the fluid that runs into the refrigeration unit to obtain optimized performance and functioning of the evaporator independent of climate or load conditions.
3 Wiring Connections The superheat regulation is performed only when the cooling digital input is enabled. Figure 3-1 shows how the device takes the request of cooling: Figure 3-1 - How XEV22D Acts on Cooling Request See Figure 3-2 for wiring. The “First Level” indicates the connections on the floor of the 4-DIN module and “Second Level” indicates the connections on the first floor that are only for the stepper motor of the valve and for the Hot Key.
4 Wiring Guidelines DEVICE TYPE RETAIL SOLUTIONS ANALOG TEMP SENSOR DIGITAL INPUT BELDEN #8761 #22-2 SHIELDED Retail Solutions P/N 035-0002 RS-485 NETWORK BELDEN #8761 #22-2 SHIELDED Retail Solutions P/N 035-0002 BELDEN #8641 #24-2 SHIELDED Retail Solutions P/N 135-8641 PRESSURE TRANSDUCER **BELDEN #8771 #22-3 SHIELDED Retail Solutions P/N 135-8771 **#8771 for alternate 600v rated wire use BELDEN #8618 16 AWG *STEPPER VALVE Use valve manufacturer’s harness with a maximum length not to exceed 30 fe
5 Mounting and Powering The XEV22D is usually mounted by the Refrigeration equipment manufacturer. Therefore, the installer need only make the necessary connections between the boards and the site controller(s). In some instances, an installer may be required to mount the XEV22D. There are no restrictions on the location of the XEV22D; however, the controller should be mounted in a location protected from moisture. Typically, mounting inside the electrical control panel of a package unit is acceptable.
Transformer Part Number VA Rating Primary Voltage 640-0040 50VA 110/208/220 VAC 640-0041 50VA 110 VAC 640-0042 50VA 220 VAC Table 5-2- Transformer Compatible with XEV22D 5.2.2. XEV22D Power Wiring The XEV22D can be powered by one of the 50VA non-center-tapped transformers listed in Table 5-2. Neither side of the secondary should be connected to ground. Also, do not connect the center tap (if provided on the transformer) to ground.
6 Valve Connections and Configuration CAUTION! To avoid possible problems, before connecting the valve configure the driver by making the right changes on the parameters.
Connection Numbering SPORLAN SAGINOMIYA 4 ORANGE ORANGE 2 RED RED 3 YELLOW YELLOW 1 BLACK BLACK 5- Common GRAY GRAY Table 6-3 - 5 to 6 Wire Valves (Unipolar) NOTE: After making the connection, switch the XEV controller OFF and ON to make sure that the valve is positioned properly. It is highly recommended that the maximum distance of the stepper valve harness length between the valve and the XEV22D controller must not exceed 30 feet (10 meters).
6. Note the mA terminal on the meter. It should be labeled 400 mA or 300 mA. 7. Power up the XEV22D controller. 8. Cycle the valve and verify the meter AC amp reading is less than 0.3A. CAUTION: 0.3A is 300mA; if the AC amp reading in step 8 was above your meters mA terminal label: STOP and check. DO NOT proceed or your meter will be damaged. 9. If step 8 reading was less than 0.3A, power down the XEV22D and move the meter red lead from the meter 10A terminal to the meter 400 mA or 300mA terminal. 10.
8 Front Panel Key Function To lock and unlock the keyboard. To enter programming mode. Table 8-1- XEV22D Front Panel Keys and Functions 8.2. XEV22D LEDS Each LED function is described in Table 8-2: LED Mode Function ON Low pressure alarm ON Maximum operating pressure alarm OFF Valve is completely closed BLINKING ON Valve is moving Valve is completely opened Figure 8-1 - XEV22D Front Panel BLINKING Serial communication present OFF Serial communication absent ON Superheat alarm 8.1.
9 User Interface 9.1. To See the Read-Only Values 2. The device will display the first parameter in Pr1 menu. 9.5. To Enter Pr2 Parameters List To enter to Pr2 parameters list: 1. Press and release the UP arrow key. 2. The first read-only label is displayed. 3. Slide labels using the UP or DOWN arrow keys. 4. Press the SET key to see the read-only value. To change and view the parameter, press SET. 5.
9.7. How to Assign a MODBUS Address 1. To enter the programming mode, press and hold the SET and DOWN arrow keys together for about three (3) seconds or until the dots at the top of the display start flashing. 2. Arrow down to PR2 and press SET to select. 3. PAS for password will display and flash. 4. Use the arrow keys to set the 321 password. Press SET to save. NOTE: If a time-out occurs while setting the password (PR2 flashes), press SET to resume entering the password. 5.
10 Parameters NOTE: All pressure parameters are relatives or absolutes depending on the PrM parameter. Code Description Function REGULATION Fty Kind of gas (R22, 134, 404, 407, 410, 507, CO2) Type of gas used by plant. Fundamental parameter for correct functioning of all systems. PEo Probe error opening percentage (0 to 100%) If a temporary probe error occurs, valve opening percentage is PEo until PEd time is elapsed.
Code Description Function Ust Maximum number of steps (LSt to 800*10) Selects the maximum number of steps. At this number of steps, the valve should be opened completely. Read the datasheet provided by the valve manufacturer to set this parameter correctly. The maximum number of steps should be set within the advised range of functioning. CAUTION! When this parameter is changed, the valve must be re-initialized.
Code Description rS Band offset (-12.0 to 12.0°C / -21to21°F) PI band offset. It moves the proportional band of the PI. With rS = 0, the band is between Set to Set + Pb. InC Integration time Function (0 to 255 sec) PI integration time PROBE PARAMETERS tPP Type of pressure transducer (420 – 5V – LAn) Sets the type of pressure transducer to use: 420 = 4 to 20mA pressure transducer; 5V = 0 to 5V ratiometric transducer; LAn = the pressure signal comes from another XEV module.
Code Description Function tdA Type of alarm signaled by relay (ALL, SH, PrE, di) ALL = all alarm; SH = superheat alarm; PrE = pressure alarm; di = activation only when digital input configured as rL is activated. LPL Lower pressure limit for superheat regulation (PA4 to P20 bar/ psi) When the suction pressure comes down to LPL, the regulation is performed with a LPL fixed value for pressure; when the pressure comes back to LPL, the normal pressure value is used. (related to PrM parameter).
Code Description Function PrM Pressure visualization mode (rEL to AbS) rEL = relative pressure; AbS = absolute pressure All pressure parameters depend on this parameter. CLP Cooling percentage (Read only) Displays the percentage of time during which the cooling call was active in the time interval defined by parameter CLt. tP1 Temperature probe value (Read only) Shows the temperature probe value from P1. PPr Pressure probe value (Read only) Shows the pressure probe value.
11 Digital Inputs The XEV22D comes with two (2) digital inputs: a voltage-free input and a high voltage input; both can be configured as cooling call. In this way the cooling signal can come from the controllers with direct load outputs or via the controllers with voltage-free outputs. One of these inputs must be configured as the cooling call. 13.1.
15 How to Use the Hot Key NOTE: The Err message is displayed in case an error or failure in programming occurs. In this case, turn the unit OFF and then ON if you want to restart the download or remove the Hot Key to abort the operation. 15.1. How to Program a Hot Key From the Controller (Upload) 1. Program one controller using the front keypad. 2. When the controller is ON, insert the Hot Key and press the UP arrow key; the uPL message will appear followed by a flashing End LED. 3.
16 Display Messages Message Cause Outputs nA None of the digital inputs configured as CCL are activated Valve closed Pf The PEd time is elapsed and the regulation is stopped. Valve closed after PEd. There is a probe error.
17 Specifications Housing Self extinguishing ABS Dimensions Case: Front: 4 DIN modules, 70 mm x 135 mm with male and female connectors Depth: 60 mm Mounting: DIN RAIL mounted in a omega (3) din rail Protection IP20 Connections Detachable screw terminal block ≤ 2.5 mm2 wiring Power Supply 24VAC/DC ±10% Power Absorption (depending on the valve) 20VA max Display Three (3) digits with icons, red LEDs, height 14.
18 E2 MODBUS Network Wiring • Connect MODBUS Network to the RS485 Connector on the E2 PIB board (Belden 8641 recommended). • Note to wire the RS485 +/- polarity at the E2 in the reverse of the XEV22D devices. • Position the three termination jumpers to the UP (terminated) position to provide RS485 termination at the E2. • Do not connect the shield of the MODBUS network to the E2 PIB center terminal. Instead, use a 100 ohm 1/2 watt resistor to connect the MODBUS cable shield to earth ground.
19 ECT MODBUS Networking to E2s 19.1. COM Port Associations - E2 Versions 3.xx and Below Connect the MODBUS network cable to the threeterminal connector on the COM port you wish to assign as MODBUS. Reverse polarity of +/- on RS485 cable from E2 to the device. Figure 19-2 - MODBUS Networking COM ports can only be used for one function; in other words, if COM2 is set up as the I/O network, you cannot connect MODBUS devices to COM2.
19.2. COM Port Associations - E2 Versions 4.2 and Above 3. Press + to open the Serial tab of the General Controller Info setup screens: Figure 19-4 - Serial Communications Manager Screen 4. This screen will have a “Connection” field for all COM ports on the E2. Highlight the COM port connection field that will be used for the device, and press - LOOK UP. From the list of network types, select MODBUS. 5.
and Controllers. through the front display, and press to select it. A window will open where you can specify the address of the controller. If a network ID has already been selected, its name will be shown next to the network ID in this list. If the network ID you are trying to assign has already been used, you must set the address on this device to a different number that is not being used. Figure 19-5 - Num Network Ctrls: NetSetup Screen 3.
firmware on it. 19.5. MODBUS Termination Blocks Because the XEV22D device has no on-board means of termination, use the MODBUS termination block (P/N 535-2711) for termination that can be wired to the end of the cable segment using the threepin connector. Wire the two signal wires to the outside terminals, and connect the shield to pin 16, keeping the exposed shield wire length as short as possible (3 inches ideal maximum length). Figure 19-8 - Network Summary Screen 19.4.
20 Standard Values NOTE: For viewing and adjusting setpoints, refer to: Section 9.2., To See the Setpoint and Section 9.3., To Modify the Setpoint.
Label Description Range Default Level CL – OP CL Pr2 0 to 255 min 0 Pr2 i1P Free of voltage digital input polarity d1d Digital input 1 (free of voltage) activation delay i2P Main voltage digital input polarity CL – OP CL Pr2 i2F Main voltage digital input function CCL, rL CCL Pr2 d2d Digital input 2 (Main voltage) activation delay 0 to 255 min 0 Pr2 0.0 to 42.0 min: tens of seconds 10.
The contents of this publication are presented for informational purposes only and they are not to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. Emerson Climate Technologies Retail Solutions, Inc. and/or its affiliates (collectively “Emerson”), reserves the right to modify the designs or specifications of such products at any time without notice.
