026-1307 Rev 4 28-JUN-2011 Modular Refrigerant Leak Detection Sensor (MRLDS) Installation and Operation Manual
Retail Solutions 3240 Town Point Drive NW, Suite 100 Kennesaw, GA 30144, USA 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 OVERVIEW ............................................................................................................................................. 1 1.1 SPECIFICATIONS ................................................................................................................................................. 1 1.2 MRLDS MODELS ............................................................................................................................................... 1 1.
5.3.10.3 Status Screen........................................................................................................................................................... 13 5.3.10.4 Setup/Online Screen................................................................................................................................................ 14 5.3.10.5 Firmware Revision Screen..........................................................................................................................
1 Overview Retail Solutions specs a modular refrigerant leak detection sensor (MRLDS) that continuously monitors for low levels of refrigerants most commonly used in commercial refrigeration systems. The MRLDS communicates with the E2 controller via direct connect MODBUS, a Gateway board connected to the RS485 I/O Network, or via the analog input on a MultiFlex board. 1.
If a transformer is shared between MRLDS units, the “ACN” of each MRLDS must be wired to the same phase of the transformer. 120VAC Tr MRLDS I MRLDS II er 24VAC rm o sf an ACN Figure 1-2 - Powering Multiple MRLDS Units 2 Choosing a Mounting Location Figure 2-1 - Sensor Base And Cover 2.1 Mounting The Sensor The refrigeration monitor comprises two basic parts: the base and the cover. The cover incorporates the circuit board with the sensing elements.
3 E2 MODBUS Direct Support for MRLDS 3.1 Network Connection to E2 Figure 2-2 - Attaching and Removing Cover 2.2 MRLDS Dimensions Connecting an MRLDS to an E2 unit requires the E2 version 3.01 and above. Contact Retail Solutions for upgrade information if the controller is a version prior to 3.01. 3.1.1 COM Port Associations - E2 Versions 3.xx and Below Figure 3-1 - Location of E2 COM Ports - E2 PIB Board (E2 version 3.
in E2 General Services (, Serial tab) to enable COM4 or an E2 Expansion COM Card (P/N 6374871) to enable COM6. Connect the MODBUS network cable to the three-terminal connector on the COM port you wish to assign as MODBUS. Wire RS485+ to the MRLDS+ RS485- to the MRLDS- and the shield cable to the MRLDS GND. 3.1.2 COM Port Associations - E2 Versions 4.0 and Above not the first device. For E2 versions 4.
Boards and Controllers. Figure 3-4 - Serial Communications Manager Screen 4. 5. This screen will have a “Connection” field for all COM ports on the E2. Highlight the COM port connection field that will be used, and press - LOOK UP. From the list of network types, select MODBUS. Four fields will become visible underneath the COM port connection field, which pertain to the way the device communicates: Figure 3-5 - Connected I/O Screen 3. 4.
4 MRLDS Analog Version (809-100x) 4.1 Network Layout Analog MRLDS to MultiFlex MULTIFLEX BOARD LOWER RIGHT CORNER ACN 24VAC GAS(+) OUT(V) ANALOG MRLDS INSIDE LOWER PORTION OF BASE 1 3 2 0V 0V SIG BELDEN 8761 4 SIG INPUT 14 OUT(V) TO 24VAC, 10VA CLASS 2 POWER SUPPLY Ground INPUT 13 SIG 0V Ground will see one of the following messages: •Online - The MRLDS is communicating normally.
7. Refrigerant Type J2|J1 Manually enter the following parameters on the Input Setup screen: •Sensor Type: Linear R-22 •Low End Point: 0.8V •Low Eng. Units: -50 R-134a, R-407A, R-407C, R-410A, R-427A •Select Eng. Units: PPM •HighEnd Point: 5.5V R-404A, R-422A, R-422D, R-507 •High Eng. Units: 1125 •Low End Limit: -100 Table 4-1 - Refrigerant Jumper Settings •HighEnd Limit: 1150 4.4 Controller Setup For Analog MRLDS 4.4.1 E2 Controllers Version 2.5 and Newer 1. Log in to the E2 controller. 2.
5 MRLDS Gateway Version (809-101x) 5.1 Network Layout 5.2.2 MRLDS Network Addressing Modbus network settings are set on jumpers J5, J4, and J3. Refer to Table 5-1 (also included on the inside label of the MRLDS) for network addressing with corresponding jumper settings. If more than one MRLDS is on the network, each unit must have a unique address and be numbered according to the inside label (Table 5-1) specifications.
5.2.
Factory Mode 4 (Lsb) J6 Trouble Mode 8 (Lsb) J1 Termination jumper J6 J5 J4 J3 J2 J1 Figure 5-5 - MRLDS Termination (Inside Lower Left of Cover) 5.2.6 Modbus Output Fault and Module State PDU Address 0x0000 Logical Address 1 0x0001 2 0 to 40 Gas Concentration 0x0002 3 -20 to 1050 (PPM) Gas Numbers R-22 = 6 R-404A = 27 R-134a = 15 Table 5-3 - RS485 Output Specifications See Table 5-3 below for Modbus registers in the MRLDS Unit.
5.3.2 Gateway Connections Up to 12 MRLDS units may be connected to the Gateway board (P/N 810-3040). The Gateway board can interface with a site controller as a 16AI or as an IRLDS. If the site controller is an Einstein or E2, it is recommended to interface them as an IRLDS. Multiple Gateways can be used, each with up to 12 connected MRLDS units. 5.3.3 The Gateway Board Class 2 center-tapped transformer.
5.3.6 Wire Connections Using shielded three-conductor network cable (Belden #8641 or equivalent), connect the RS485 I/O Network wire to the three-terminal connector on the Gateway board as shown in Figure 5-9. For further information about how RS485 networks are configured, refer to your site controller’s user manual. To terminate the Gateway (the Modbus jumpers should always be terminated on the Gateway), set the receiver bus jumpers to the RIGHT position (Figure 5-11).
5.3.9 Setting the Baud Rate Dip Switches Dip switches 6 and 7 control the baud rate at which the Gateway communicates with the site controller on the RS485 Network. These switches must be set to the same baud rate setting as the controller you are using (Einstein, RMCC, or E2), and defaults to 9600 baud. Dip switch 8 controls the baud rate at which the Gateway communicates with the MRLDS. For 9600 baud, set dip switch 8 to the OFF position.
5.3.11 Gateway Troubleshooting 100: GAS: ST: ALM: FAIL CNT: 1 R134A NORMAL NONE I/O NET Figure 5-17 - Status Screen NOTE: If the HHT displays any type of alarm, contact the Retail Solutions Service Department (770-425-2724) to verify if the MRLDS unit should be replaced. 5.3.10.4 Setup/Online Screen 2 - The Setup/Online screen displays the addressing of the devices and whether they are enabled. Press the right/ left arrows to select the first address in the list.
5.4.4 ways. Navigate to the controller’s Input Status screen and highlight the board and point that you wish to map. Press F1 to go to the Input Setup screen for that board/point. Each point will increase incrementally to correspond with each board. (For example, where the MRLDS is address 1 and the MRLDS address is 100, use board 1, point 1. For an MRLDS address of 101, use point 2.) 5.4.
field to change the name, and press the down or right arrow to move to the (sensor) Type field. Use the “.” and “—” keys to scroll through the options and select IRLDS. (The Gain and Offset parameters are automatically configured for you.) 13. Use the arrow keys to move off the active fields and press 0 (zero) twice to go back to the main screen. 5.4.5 5.4.5.1 BEC and RMCC Controllers Less Than Version 2.1 Input Definitions Locate the screen in the BEC or RMCC where sensors are set up.
“MV” should be entered for sensor inputs that read fault status. 6 Diagnostics 6.1 MRLDS LED Indicators Gain and Offset Since the output terminals emit one volt for every 250 PPM of refrigerant detected, the gain for the refrigerant leak sensors must be set to 250 and the Offset to 0. The sensors configured to detect faults must be given a gain of 1000; this way, the REFLECS can be set up to alarm whenever it detects a 5000 mV signal. 5.4.5.
6.3 Linearity Settings for Supported Refrigerants Factors such as air movement and the proximity of the sensor to the leak will usually have a greater influence on the reading (Rdg) than the differences in the linearity (accuracy) of the various supported refrigerants, so the alarm limits should not have to be adjusted.
