026-1203 Rev 0 09-FEB-2011 XR35CX Digital Controller for Medium Temperature Refrigeration Applications 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 ...........................................................................................................................................
8.2. SERIOUS ALARM MODE (I2F=BAL) ........................................................................................................................... 14 8.3. PRESSURE SWITCH (I2F=PAL) ................................................................................................................................... 14 8.4. DOOR SWITCH INPUT (I1F OR I2F=DOR) .................................................................................................................... 14 8.5.
1 Introduction 2 Overview 1.1. General Warning 2.1. General Description Please read the following safety precautions and warnings before using this manual: Model XR35CX (32 mm x 74 mm) is a digital thermostat with off-cycle defrost, designed for refrigeration applications at normal temperature. It has two (2) relay outputs to control compressor and light (configurable).
3 Controlling Loads 3.1. Compressor The regulation is performed according to the temperature measured by the thermostat probe with a positive differential from the setpoint: if the temperature increases and reaches setpoint plus the differential, the compressor is started and then turned OFF when the temperature reaches the setpoint value again.
3.3.5. Neutral Zone Regulation With oA1 = db, relay 1-7 can control a heater element to perform a neutral zone action. • oA1 cut in = SEt - Hy • oA1 cut out = SEt 3.3.6. Alarm Relay With oA1 = ALr, the relay 1-7 operates as an alarm relay. It is activated every time an alarm occurs. Its status depends on the tbA parameter: if tbA = y, the relay is silenced by pressing any key. If tbA = n, the alarm relay remains ON until the alarm condition recovers. 3.3.7.
4 Front Panel Commands Switches the light ON and OFF, if oA1 = Lig. Key Combinations To lock and unlock the keyboard. To enter programming mode. To return to the room temperature display. Table 4-1 - XR35CX Front Panel Keys and Functions 4.2.
5 MAX and MIN Temperature Memorization 5.1. How to See the MIN Temperature 1. Press and release the DOWN arrow key. 2. The Lo message will be displayed followed by the minimum temperature recorded. 3. By pressing the DOWN arrow key again or by waiting 5 seconds, the normal display will be restored. 5.2. How to See the MAX Temperature 1. Press and release the UP arrow key. 2. The Hi message will be displayed followed by the maximum temperature recorded. 3.
6 Main Functions the setpoint value. 2. The value of the setpoint will be displayed and the °C or °F LED starts blinking. 3. To change the setpoint value, push the UP or DOWN arrow keys within 10 seconds. 6.1. To Set the Current Time and Day (Only for Controllers with RTC) When the controller is switched ON, it is necessary to program the time and day. 1. Enter the Pr1 programming menu by pressing the SET + DOWN arrow keys combination for 3 seconds. 2. The rtc parameter displays.
Menu 1. Enter the Programming mode by pressing the SET + DOWN arrow keys for 3 seconds (the °C or °F LED starts blinking). 2. Immediately release the keys, then push the SET + DOWN arrow keys again for more than 7 seconds. The Pr2 label will be displayed immediately followed by the Hy parameter. NOW YOU ARE IN THE HIDDEN MENU. 3. Select the required parameter. See Section 7, Parameters for the list of parameters. 4. Press the SET key to display its value. 5.
7 Parameters Code rtc Parameter Function Real time clock menu (only for controller with RTC) Sets the time and date and the defrost start time. REGULATION Hy Differential (0.1 to 25.5°C / 1 to 255°F) Intervention differential for setpoint. Compressor Cut IN is Setpoint + differential (Hy). Compressor Cut OUT is when the temperature reaches the setpoint. LS Minimum setpoint (-100°C to SEt/-148°F to SEt) Sets the minimum value for the setpoint.
Code Parameter Function CoF Compressor OFF time with faulty probe (0 to 255 min) Time during which the compressor is OFF in case of faulty thermostat probe. With CoF = 0, compressor is always active. CH Type of action CL = cooling; Ht = heating DISPLAY CF Temperature measurement unit °C = Celsius; °F = Fahrenheit CAUTION! When the measurement unit is changed, the setpoint and the values of the parameters Hy, LS, US, ot, ALU, and ALL have to be checked and modified if necessary.
Code Parameter Function IdF Interval between defrost cycles (0 to 120 hr) Determines the time interval between the beginning of two defrost cycles. MdF Maximum duration for defrost (0 to 255 min) When P2P = n, (not evaporator probe: timed defrost), it sets the defrost duration. When P2P = y (defrost end based on temperature), it sets the maximum duration for defrost.
Code Parameter Function ALC Temperature alarms configuration (Ab; rE) Ab = Absolute temperature: alarm temperature is given by the ALL or ALU values; rE = Temperature alarms are referred to the setpoint. Temperature alarm is enabled when the temperature exceeds the SEt + ALU or SEt- ALL values. ALU MAXIMUM temperature alarm (ALL to 110°C; ALL to 230°F) When this temperature is reached, the alarm is enabled after the ALd delay time.
Code Parameter Function oA1 Second relay configuration (1-7) dEF = defrost; FAn: do not select it!; ALr: alarm; Lig: light; AUS: Auxiliary relay; onF: always ON with controller ON; db = neutral zone; cP2 = do not select it!; dEF2: do not select it!; HES: night blind AOP Alarm relay polarity Set if the alarm relay is open or closed when an alarm happens.
Code Parameter Function TO SET ENERGY SAVING TIMES (ONLY FOR MODELS WITH RTC) iLE Energy Saving cycle start during workdays (0 to 23 hr 50 min) During the Energy Saving cycle, the setpoint is increased by the value in HES so that the operation setpoint is SEt + HES. dLE Energy Saving cycle length during workdays (0 to 24 hr 00 min) Sets the duration of the Energy Saving cycle on workdays. iSE Energy Saving cycle start on holidays.
8 Digital Inputs The first digital input 18-20 is enabled with P3P = n. With P3P = n and i1F = i2F, the second digital input is disabled. The free voltage digital inputs are programmable by the i1F and i2F parameters. 8.1. Generic Alarm (i2F=EAL) As soon as the digital input is activated, the unit will wait for the did time delay before signaling the EAL alarm message. The outputs status do not change. The alarm stops just after the digital input is deactivated. 8.2.
8.10. ON/OFF Function (i2F=onF) Switches the controller ON and OFF. 8.11. Digital Inputs Polarity The digital input polarity depends on the i1P and i2P parameters. • i1P or i2P = CL: the input is activated by closing the contact. • i1P or i2P = oP: the input is activated by opening the contact.
9 RS485 Serial Line (for Monitoring Systems) 10 X-REP Output (Optional) Optionally, an X-REP can be connected to the controller through the dedicated connector. The RS485 serial line allows you to connect the controller to a monitoring system MODBUS-RTU compatible, such as the X-WEB500/3000/300. Figure 10-1 - X-REP Output To connect the X-REP to the controller, the following connectors must be used: CAB-51F(1m), CAB-52F(2m), and CAB-55F(5m).
11 Installation and Mounting 12 Electrical Connections The controller comes with a screw terminal block to connect cables with a cross section up to 2.5 mm2. Before connecting 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. 12.1.
13 How to Use the Hot Key 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 push the UP arrow key; the uPL message appears followed by a flashing End LED. 3. Push the SET key and the End LED will stop flashing. 4. Turn OFF the controller, remove the Hot Key, then turn it ON again. NOTE: The Err message is displayed in case of an error or failure in programming.
14 Alarm Signals Message Cause Outputs P1 Room probe failure Compressor output acc. to par. Con and COF P2 Evaporator probe failure Defrost end is timed P3 Third probe failure Outputs unchanged P4 Fourth probe failure Outputs unchanged HA Maximum temperature alarm Outputs unchanged LA Minimum temperature alarm Outputs unchanged.
15 Specifications Housing Self extinguishing ABS Dimensions Case: Front: 32 mm x 74 mm Depth: 60 mm Panel Mount: 71 mm x 29 mm panel cut-out Protection IP 20 Frontal: IP65 Connections Screw terminal block ≤ 2.5 mm2 wiring Power Supply (depending on the model) 24VAC, ±10% 230VAC, ±10%, 50/60Hz 110VAC, ±10%, 50/60Hz Power Absorption 34VA max Display 3 digits, red LED, 14.
16 Connections Figure 16-1 - XR35CX Connections • Supply: 120VAC or 24 VAC: connect to terminals 5-6. • The X-REP output is optional.
17 E2 MODBUS Network Wiring • Connect the 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 XR35CX 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.
18 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. E2 PIB COM PORT ASSOCIATIONS E2 Enclosure (Right Side) Connecting a XR35CX controller to an E2 requires the E2 to be version 2.84 or above. Contact Retail Solutions for upgrade information if the controller is a version before 2.84.
3. Press + to open the Serial tab of the General Controller Info setup screens: and Controllers. Figure 18-4 - Num Network Ctrls: NetSetup Screen Figure 18-3 - 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.
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. that has the latest version of firmware on it. Figure 18-7 - Network Summary Screen Figure 18-6 - List of MODBUS Devices 7. Repeat Steps 5 and 6 until each device has a name and address. 8.
18.2. Wiring Types Retail Solutions specifies Belden #8761 shielded twisted pair cables for use as MODBUS wiring (or Belden #82761 and Belden #88761 for plenum installations). For MODBUS network wiring of XR35CX controllers to E2, Belden #8641 (CPC P/N 135-8641) is the recommended wire type to use.
19 Default Setting Values Label Name Range Value Level SEt Setpoint LS to US 3.0 --- rtc* Real time clock menu --- --- Pr1 Hy Differential 0.1 to 25.5°C/ 1 to 255°F 2.0 Pr1 LS Minimum setpoint -100°C to SEt/-58°F to SEt -50.0 Pr2 US Maximum setpoint SEt to 110°C/ SEt to 230°F 110 Pr2 ot Thermostat probe calibration -12 to 12°C /-120 to 120°F 0.
Label Name Range Value Level dAd MAX display delay after defrost 0 to 255 min 30 Pr2 Fdt Draining time 0 to 120 min 0 Pr2 dPo First defrost after start-up n = after IdF; y = immediate n Pr2 dAF Defrost delay after fast freezing 0 to 23 hr and 50’ 0.0 Pr2 ACH Kind of action for auxiliary relay CL; Ht CL Pr2 SAA Setpoint for auxiliary relay -100 to 110°C / -58 to 230°F 0.0 Pr2 SHy Differential for auxiliary relay 0.1 to 25.5°C/ 1 to 255°F 2.
Label Name Range Value Level i1P Digital input polarity (18-20) oP = opening CL= closing CL Pr1 i1F Digital input 1 configuration (18-20) dor; dEF dor Pr1 i2P Digital input polarity (18-19) oP = opening CL = closing CL Pr1 i2F Digital input configuration (18-19) EAL - bAL- PAL - dor - dEF - ES - AUS - Htr - FAn - HdF - onF EAL Pr2 did Digital input alarm delay (18-20) 0 to 255 min 15 Pr2 doA Door open alarm delay 0 to 255 min 15 Pr1 nPS Number of activation of pressure sw
Label Name Range Value Level not used Pr2 onF ON/OFF key enabling not used, oFF, ES dP1 Room probe display --- --- Pr1 dP2 Evaporator probe display --- --- Pr1 dP3 Third probe display --- --- Pr1 dP4 Fourth probe display --- --- Pr1 rSE Real set actual set --- Pr2 rEL Software release --- 2.
