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026-1307 Rev 1 11-30-07
Modular Refrigerant Leak Detection
Sensor (MRLDS) Installation and
Operation Manual
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Computer Process Controls, Inc. 1640 Airport Road Suite #104 Kennesaw, GA 31044 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. be liable for any direct, indirect, special, incidental, or consequential damages resultin
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Table Of Contents 1 OVERVIEW ................................................................................................................................................................... 1 1.1 SPECIFICATIONS............................................................................................................................................................. 1 1.2 MRLDS MODELS ........................................................................................................
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1 Overview CPC specs a modular refrigerant leak detection sensor (MRLDS) that continuously monitors for low levels of refrigerants most commonly used in commercial refrigera- tion systems. The MRLDS communicates with the E2 controller via a Gateway board connected to the RS485 I/O Network, or via the analog input on a MultiFlex board. 1.1 Specifications Figure 1-1 - Sensor Base Opening With Screw Terminals 1.2 MRLDS Models 24 VAC, ±20%, 50/60 Hz, Class 2 Power Require- ments 14 AWG max, Cla
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If a transformer is shared between MRLDS units, the “ACN” of each MRLDS must be MRLDS II MRLDS I wired to the same phase of the transformer. 24VAC 120VAC ACN Figure 1-2 - Powering Multiple MRLDS Units Figure 2-1 - Sensor Base And Cover 2.1 Mounting The Sensor 2 Choosing a The refrigeration monitor comprises two basic parts: Mounting Location the base and the cover. The cover incorporates the circuit board with the sensing elements. Proper location of the refrigerant sensor is necessary to
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3 MRLDS Analog Version (809-100x) 3.1 Network Layout E2 Figure 2-2 - Attaching and Removing Cover I/O Net MultiFlex Board 2.2 MRLDS Dimensions MRLDS Units Figure 3-1 - Analog MRLDS Network Layout Example 3.2 MRLDS Wiring For analog MRLDS units, connect to a MultiFlex board via the analog input (use Belden 8761 cable). Analog MRLDS MULTIFLEX BOARD - to MultiFlex LOWER RIGHT CORNER ANALOG MRLDS - INSIDE LOWER PORTION OF BASE 12 34 5 6 7 8 0V 0V 0V SIG 0V SIG SIG SIG INPUT 13 INP
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5. Select the board/point input. 3.3 Refrigerant Jumper 6. Press F1 Setup. Settings 7. Select Analog Sensor. 8. On the Analog Input screen, select MRLDS The jumper settings for refrigerant types are located on Refr. as the Sensor Type. The parameters are the label inside the MRLDS sensor cover (shown in Fig- then automatically configured for you. ure 1-1). Set the jumpers according to how they are indi- cated on the label. 9. Press the (Back) button to save changes. The MRLDS supports thr
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4.2 MRLDS Setup 4.2.1 MRLDS Wiring MODBUS MRLDS - INSIDE LOWER PORTION OF BASE To Gateway Board A transformer must never be shared between MRLDS and the Gateway board. A separate transformer must be used. 14 AWG less MODBUS than 6 inches If a transformer is NETWORK Shield shared between drain/ground Figure 3-4 - Analog Input Screen Settings Example for E2 BELDEN MRLDS units, 8761 wire the “ACN” of each MRLDS 3.4.3 RMCC Controllers must be wired to the same For RMCC-type control
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the J2 or J1 sockets respective per the inside label. 4.2.3 Address Settings Modbus Address J5|J4|J3 Jumper Settings J6 J1 100 J5J4 J3 J6 J2 J1 term refrigerant network No jumpers installed jumper type address jumpers 101 jumpers 102 Figure 4-4 - Modbus Jumper Layout (Inside Lower Portion of Cover) Enlarged To Show Detail 103 104 Refrigerant Type J2|J1 R-22 105 R-404A 106 R-134A 107 Table 4-2 - Refrigerant Jumper Settings 108 4.2.5 MRLDS Termination 109 The MRLDS has a built-
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bits with no parity and 2 (two) stop bits. Register PDU Logical Range Name Address Address SELECT I/O NET MODE OFF = IRLDS Fault and 0x0000 1 Under Range ON = 16AI Module 2 (msb) State Under Volt- ON age 8 (msb) Temperature 10 (msb) Lamp Fail 40 (msb) OFF = IRLDS ON = 16AI Test Mode 80 (msb) Warm Up Complete 0 (Lsb) Figure 4-6 - I/O Network Modes Cal/Setup 4.3.2 Gateway Connections 2 (Lsb) Up to 12 MRLDS units may be connected to the Gate- Factory way board (P/N 810-3040). The Gateway b
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CAUTION: Before installing the Gateway board, verify the jumper JP7 (located near the top center of the board) is set to the “NOR- MAL” position (not the “TEST” position). Operating the Gateway with the jumper in “TEST” position may cause board damage. The Gateway Board communicates with the MRLDS via the Modbus network, which is connected to the Gate- way’s “Receiver Bus” network terminal. The Gateway communicates with the E2 via the RS485 I/O Network. 4.3.4 Powering the Gateway Board Fi
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controller’s user manual. GATEWAY BOARD RS485 I/O NET TERM JUMPERS -485 0v +485 RS485 TERMINATION I/O NET (TO CPC (ALWAYS CONTROLLER) TERMINATE) Figure 4-9 - Connecting the Gateway to the E2 RS485 Network To connect the Gateway to an MRLDS, feed the wires through the rectangular opening in the sensor base as indi- Figure 4-11 -MRLDS Gateway Termination cated in Figure 1-1. Locate the RS485 connector and 4.3.8 Gateway Board I/O Net secure the wire leads to the connector orienting them as sh
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4.3.9 Setting the Baud Rate Dip Switches I/O ADDR: 1 I/ O BAUD: 9600 Dip switches 6 and 7 control the baud rate at which the Gateway communicates with the site controller on the MO D BAUD: 19200 RS485 Network. These switches must be set to the same baud rate setting as the controller you are using (Einstein, FAIL I/O NET RMCC, or E2), and defaults to 9600 baud. Dip switch 8 Figure 4-15 - Baud Rate/Address Screen controls the baud rate at which the Gateway communicates T
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4.3.11 Gateway Troubleshooting If there is an issue with the Gateway board, the HHT 100: CNT: 1 Home screen (F1) can give status indicators to report the GAS: R134A issue. The Home screen will display a warning if there is a ST: NORMAL failure associated with the I/O Network or flash on the AL M: NONE Gateway board. Select the HHT Status screen to view sta- FAIL I/O NET tus information for each MRLDS unit. Figure 4-17 - Status Screen 4.4 Controller Setup for NOTE: I
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ways. 4.4.4 RMCC Controllers Version Navigate to the controller’s Input Status screen and 2.1 and Newer highlight the board and point that you wish to map. Press F1 to go to the Input Setup screen for that board/point. 4.4.4.1 REFLECS Setup for IRLDS IIs Each point will increase incrementally to correspond with Set dip switch 8 to ON and follow the steps for setting each board. (For example, where the MRLDS is address 1 up IRLDS IIs through the REFLECS controller interface: and the MRLDS
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field to change the name, and press the down Locate the screen in the BEC or RMCC where sensors or right arrow to move to the (sensor) Type are set up. This is usually a menu option in the Sensors field. Use the “.” and “—” keys to scroll Menu, which may be reached from the Main Menu. through the options and select IRLDS. (The The 0-4.8V signal is a linear signal representing a mea- Gain and Offset parameters are automatically sured concentration of 0-1200 ppm, and a voltage of 5.0V configu
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“MV” should be entered for sensor inputs that read fault 5 Diagnostics status. Gain and Offset Since the output terminals emit one volt for every 250 5.1 MRLDS LED Indica- ppm of refrigerant detected, the gain for the refrigerant leak sensors must be set to 250 and the Offset to 0. tors The sensors configured to detect faults must be given a gain of 1000; this way, the REFLECS can be set up to The MRLDS has three LEDs for quick status indica- alarm whenever it detects a 5000 mV signal. tio
