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Summary of Contents for AMR MC-4231
- Page 1 MC-4231- CO MODBUS ADDRESSABLE SENSOR Manual Part Number 180-0547 November 28, 2001 PAGE 1...
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Page 2: Table Of Contents
TABLE OF CONTENTS TITLE PAGE Table of Contents ....................2 List Of Figures ....................4 1. Introduction....................5 1.0. General.....................5 1.1. Features....................5 1.2. Default Values .................6 1.3. New Features ...................6 2. Specifications....................7 3. Setup........................9 3.1. DS1 Setup Switch ................9 3.2. DS2 Cell Polarity................10 3.3. - Page 3 TABLE OF CONTENTS(CONT.) TITLE PAGE 5.6. Status Input #1 and Status Input #2 Connections .......20 5.7. Control Output #1 and Control Output #2 Connections ....20 5.8. Calibration/Test Switch Connection ..........20 5.9. 2-Wire Monitor System Connection ..........20 5.10. 4-Wire Monitor System Connection ...........20 6.
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Page 4: List Of Figures
Figure 4, Stand Alone Voltage Mode Sensor in Permissible Area ....18 Figure 5, MC-4231-CO Monitor Connection ..........21 Figure 6, 2 Wire Addressable Monitor Thru Barriers........21 Figure 7, MC-4231 (4 Wire Addressable Sensor) ...........22 Figure 8, 4 Wire Addressable Monitor Thru Barriers........22 PAGE 4... -
Page 5: Introduction
1. INTRODUCTION 1.0. General The American Mine Research MC-4231-CO Modbus Addressable Sensor is a compact monitor designed to be used with an Allen-Bradley PLC and Prosoft PLC to Modbus Protocol Converter. Available in a varity of gases, it has the traditional AMR quality construction, leading edge technology and maintenance free characteristics. -
Page 6: Default Values
Zero Offset: 1 PPM (Zero Offset is optional and provided for some users) • 1.3. New Features The American Mine Research MC-4231-CO Modbus Sensor has all the features of the earlier MC-4031 model and many more. Listed below are the new features of the MC-4231-CO sensor. -
Page 7: Specifications
2. SPECIFICATIONS Size: 7”W x 7”H x 5”D • Operating Voltage: +10VDC to +28VDC • Operating Mode: Voltage Mode Only • Operating Current: Voltage Mode = 3.0mA. • Operating Current: Addressable Sensor = 5.5mA • Voltage Mode Output: 0.1 volts for 0 ppm •... -
Page 8: Figure 1, Connection And Configuration Diagram
19.2KBAUD RATE NOT USED (POSITIVE) (2 WIRE) 2 WIRE COMM COMM ENABLE DS6 POSITION VOLTAGE MODE FIGURE 1, CONNECTION AND CONFIGURATION DIAGRAM PAGE 8... -
Page 9: Setup
3. SETUP 3.1. DS1 Setup Switch The MC-4231-CO’s setup is determined by an internal 8 position dip switch (DS1) as shown if Figure 1. The function of each position of the dip switch is described below: DS1 FUNCTIONS POSITION FUNCTION... -
Page 10: Ds2 Cell Polarity
(1-5, 2-3). 3.3. DS3 2 Wire/4 Wire Comm DS3 allows the MC-4231 to operate with either a 2 wire monitor system interface such as the MC-4000 system or a 4 wire monitor system. DS3 IS HARDWIRED FOR 2 WIRE COMM (2-4, 5-6). -
Page 11: Ds4 Comm Enable/Disable
3.5. DS5 2 Wire/3 Wire Cell DS5 is for FACTORY USE ONLY. It is used to match the sensor cell type (2 wire or 3 wire) for each gas in the MC-4231 series. DS5 IS HARDWIRED FOR 2 WIRE SENSOR CELL(2-3). -
Page 12: Reference Adjust
3.10. Reference Adjust Reference Adjust (R32) is FACTORY SET ONLY. It is used to match the different types of sensor cells to the MC-4231 electronics. Note: This should not be user adjusted. 3.11. Comm Fuses Communication Fuses F1 thru F4 have been removed. -
Page 13: Configuration
Refer to Figure 1, Connection and Configuration Diagram for MC-4231-CO Modbus Addressable Sensor. The MC-4231-CO monitor may be configured for a variety of uses. It may be used as a stand alone gas sensor in the voltage mode or it may be used with a Monitor System and serve as remote gas sensor. -
Page 14: Monitor System Sensor/Remote
4.3. Monitor System Sensor/Remote To use the MC-4231-CO monitor with the MC-4000 system as a gas sensor or as a combination sensor/small remote, connect the monitor as described in the INSTALLATION section. Set these switches as follows: JUMPER FUNCTION POSITION... -
Page 15: Installation
5. INSTALLATION 5.0. General The MC-4231-CO Modbus Addressable Sensor may be installed in a variety of configurations to solve almost any gas sensor requirements. The audible/visual alarm feature of the monitor is typically used as a working face section alarm to alert personnel of high carbon monoxide levels. -
Page 16: Power Connections
5.1. Power Connections The MC-4231-CO Modbus Addressable Sensor may be installed in a variety of configurations to accomplish different monitoring functions. Use Figure 1 and Figure 2 as reference for making connections in the following discussion of all the monitor applications. -
Page 17: Power Connection
Connect the (+) side of the voltage source to connector J1-1 (V+). Connect the (-) side of the voltage source to connector J1-3 (RTN). If the voltage output is used, connect it to J1-2 (VOT). MONITOR REMOTE MC-4231-CO +28VDC 28 VDC V OUT ANALOG INPUT... -
Page 18: Power Connection
20 VDC. Make connections from the Blue Remote to the barrier and from the barrier to the MC-4231-CO monitor as shown in Figure 4. Use the correct barrier classification types and use shielded cable between the remote barrier and the MC-4231-CO monitor. -
Page 19: Sensor Cell Connection
5.2. Sensor Cell Connection The MC-4231-CO monitor may be connected to either 2 wire or 3 wire City Technology sensor cells. For 2 wire cells, connect the SENSE (white/black wire) to J1-4 (SEN) and connect the COUNTER (white/red wire) to J1-6 (CTR). Note: The REF is not used with the 2 wire sensor cell. -
Page 20: Status Input #1 And Status Input #2 Connections
J2-3 and data (-) (TB1-2) wire to J2-4. 5. 10. 4-Wire Monitor System Connection If the MC-4231 is used either as a gas sensor or as a small remote with a 4 wire monitor system it must be connected to the RS-485 communication data line using the 4 wire connection scheme shown in Figure 8. -
Page 21: Figure 5, Mc-4231-Co Monitor Connection
TEST/CAL SWITCH DATA + DATA - +28VDC SENSOR CELL FIGURE 5, MC-4231-CO MONITOR CONNECTION BARRIER 1, 2 = CLASS J DUAL CIRCUIT, MTL 768+ MC-4231-CO BLUE REMOTE 20 VDC BARRIER 1 20 VDC DATA LINE BARRIER 2 DATA LINE PERMISSIBLE AREA... -
Page 22: Figure 7, Mc-4231 (4 Wire Addressable Sensor)
TEST/CAL SWITCH TX + TX - RX + RX - +28VDC SENSOR CELL FIGURE 7, MC-4231 (4 WIRE ADDRESSABLE SENSOR) BARRIER 1, 2, 3 = CLASS J DUAL CIRCUIT, MTL 768+ MC-4231-CO BLUE REMOTE 20 VDC 20 VDC BARRIER 1... -
Page 23: Calibration
6. CALIBRATION 6.0. General Calibration of the monitor is required by law to be performed every 30 days to allow the monitor electronics to compensate for any aging of the sensor cell. The process consists of applying ZERO and SPAN gases to the sensor cell and holding a magnet to the TEST/CALIBRATE magnetic switch to allow the electronics to save the two values. -
Page 24: Span Calibration
6.2. Span Calibration 1) Apply a SPAN gas to the sensor cell input and wait 2 minutes for the cell to stabalize. Observe that the LCD display value increases and stabalizes. 2) Hold a magnet to the magnetically activated CAL/TEST switch. 3) Observe the LCD display and verify the value jumps 2 or 3 PPM below the desired SPAN calibration value then slowly increases to the SPAN calibration gas value. -
Page 25: Testing
7. TESTING 7.0. General The TEST operation displays certain calibration and setup values along with the address of the monitor (when used with the PLC Monitor System). During TEST, the WARN and ALARM outputs will be activated and the Master Station will be alerted that the monitor is performing a TEST so the Master Station generated alarms may be prohibited. -
Page 26: Installation Check List
8. INSTALLATION CHECK LIST Use the Setup, Configuration, and Installation sections as an aid to place the appropriate switches in the correct positions for the desired monitor function (stand alone current loop output, stand alone voltage output or PLC system monitor). If the monitor function voltage mode sensor perform the following: ◊... -
Page 27: Replacement Parts
9. REPLACEMENT PARTS Part Number Description 253-0355 Sensor Board 270-0138 CO Sensor Cell Assembly 125-0160 Enclosure (MC-4231) 066-0009 LCD Display 270-0111 Test/Calibration Switch 150-0177 6 Position Terminal Block(Back Plate) 037-0028 Sonalert 270-0133 LED Permissible Visual Alarm Assembly PAGE 27...
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