026-1206 Rev 0 09-FEB-2011 XEV22D Driver for Stepper Electronic Expansion Valves Installation and Operation Manual
Retail Solutions 3240 Town Point Drive NW Suite 100 Kennesaw, GA 30144 Phone: 770-425-2724 Fax: 770-425-9319 ALL RIGHTS RESERVED. The information contained in this manual has been carefully checked and is believed to be accurate. However, Computer Process Controls, Inc. assumes no responsibility for any inaccuracies that may be contained herein. In no event will Computer Process Controls, Inc.
Table of Contents 1 INTRODUCTION.......................................................................................................................................................... 1 1.1. GENERAL WARNING ..................................................................................................................................................... 1 2 OVERVIEW ...........................................................................................................................................
17.3. MODBUS TERMINATION BLOCKS ........................................................................................................................... 22 18 STANDARD VALUES .............................................................................................................................................
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 Valve Connections and Configuration CAUTION! To avoid possible problems, before connecting the valve configure the driver by making the right changes on the parameters. Select the kind of motor (tEU parameter) and check if the valve is present in the tEP parameter table reported below: tEP Model LSt (steps*10) uSt (steps*10) CPP (mA*10) CHd (mA*10) Sr (step/s) 0 Manual settings Par Par Par Par Par 1 Sporlan SEI 0.
5 Connection Numbering SPORLAN SAGINOMIYA 4 ORANGE ORANGE 2 RED RED 3 YELLOW YELLOW 1 BLACK BLACK 5- Common GRAY GRAY Table 4-3 - 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. Absolute Maximum Power The XEV22D controller is capable of driving a wide range of stepper valves; listed in Table 5-1 are the maximum values of current that the actuator can supply to the stepper wiring.
6 Front Panel By pressing and releasing this key, it is possible to see the values of the probes. In programming mode, it slides the codes of the parameters or increases their values. In programming mode, it slides the codes of parameters or decreases their values. Key Combinations To lock and unlock the keyboard. To enter programming mode. Table 6-1- XEV22D Front Panel Keys and Functions 6.2. XEV22D LEDS Each LED function is described in Table 6-2: LED Figure 6-1 - XEV22D Front Panel 6.1.
7 User Interface 7.1. To See the Read-Only Values 2. The device will display the first parameter in Pr1 menu. 7.5. 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.
7.7. 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.
8 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 Sr Step rate (10 to 600 step/sec) Maximum speed to change a step without losing precision (= losing steps). Set parameter under the maximum speed. CPP Current per phase (Only bipolar valves) (0 to 100 * 10mA) Maximum current per phase used to drive valve. CHd Holding current per phase (Only bipolar valves) (0 to 100 * 10mA) The current per phase when the valve is stopped for more than 4 minutes.
Code Description Function 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. LPP Enable pressure probe sending in LAN (n to Y) If LPP = Y, the value of pressure read by device is sent in LAN. Only one device of the LAN can have LPP = Y. PA4 Probe value At 4mA or At 0V (-1.
Code Description Function LOP Lowest operating pressure (PA4 to P20 bar/ psi) If the suction pressure comes down to this value, a low pressure alarm is signaled with Low Pressure alarm LED (related to PrM parameter). PHY Pressure alarm hysteresis (0.1 to 5.0 bar/ 1 to 72 PSI) Alarm hysteresis to disable alarm signaling. dML delta MOP-LOP (0 to 100%) When a MOP alarm occurs, the valve will close at the dML percentage every one second until the MOP alarm is active.
Code Description Function OPP Opening percentage Shows the actual opening percentage of the valve. d1S Free of voltage digital input state (Read only) Shows the free of voltage digital input. d2S High voltage digital input state (Read only) Shows the high voltage digital input state. Adr RS485 serial address (1 to 247) Identifies the controller address when connected to a MODBUS compatible monitoring system.
9 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. How to Assign a MODBUS Address 10 Forced Opening If necessary, change the FOP parameter to force the valve to open.
11 Electrical Connections The controller comes with a screw terminal block to connect cables with a cross section up to 2.5 mm2. Heat-resistant cables have to be used. Before connecting the cables, verify that the power supply complies with the controller’s requirements. Separate the probe cables from the power supply cables, from the outputs and the power connections. Do not exceed the maximum current allowed on each relay, in case of heavier loads, use a suitable external relay.
13 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. 13.1. 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.
14 Display Messages Message Cause 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.
15 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.
16 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.
17 ECT MODBUS Networking to E2s 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.
5. Four fields will become visible underneath the COM port connection field, which pertain to the way the device communicates: ter a new name for each device in the Name field. • Baud - Default setting is 19.2k. The baud rate setting should be set to match the baud rate of the device (9600). (All devices connected to the same COM port should be set to the same baud rate.) • Data Size - Leave this field at the default value (8). • Parity - Leave this field at the default value (None).
work Setup menu, then press - Network Summary (Figure 17-7). Locate the devices you set up, and look at each device’s status in the Status field. You will see one of the following messages: • Online - The device is communicating normally. • Offline - The device is not communicating, has not been commissioned, is not functional, or is not powered up. Verify the device is powered up, wired correctly, and has the proper network address, baud rate, and parity.
17.3. 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).
18 Standard Values Label Description Range Default Level R22, 134, 404, 407, 410, 507, CO2 404 Pr2 0 to 100% 50 Pr2 0 to 239 sec - On On Pr2 Fty Kind of gas PEo Probe error opening percentage PEd Probe error delay before stopping regulation tEU Type of stepper motor uP – bP bP Pr2 tEP Automatic valve configuration 0 to 10 1 Pr2 LSt Minimum number of steps 0 – Ust See tEP Pr2 Ust Maximum number of steps LSt – 800 * 10 See tEP Pr2 Sr Step rate 10 to 600 step/s See tE
Label Description Range Default Level 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 10.0 Pr2 ALL, SH, PrE, di ALL Pr2 ALARMS dAo Alarm delay after restarting regulation tdA Type of alarm signaled by relay LPL Lower pressure limit for superheat regulation (related to PrM parameter) PA4 to P20 bar/ PSI -0.
