RKI Instruments 65-2670-XX-04 Operator'S Manual Download Page 47 | Manualshive

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65-2670-XX-04 M2A Transmitter Operator’s Manual

47

Termination Jumper

The M2A includes a 2-pin termination header (see Figure 4 on page 13) that is used when the M2A is
used in a Modbus system. Every M2A is supplied with a termination jumper (a jumper block) installed
onto this header. If the M2A is not used in a Modbus system, this jumper has no function. When the
M2A is installed in a Modbus system, this jumper must be installed in an M2A that is at the end of a
Modbus line. Any M2A in a Modbus system that is not at the end of a line must have the termination
jumper removed (see Figure 13 & Figure 14 below).

Figure 13: Multiple M2As in a Daisy Chain Configuration

ID = 125

Modbus

Master

Up to 128 M2As can be connected without a repeater

RS-485

RS-485

M2A

Termination

Jumper

Not Installed

M2A

Termination

Jumper

Not Installed

ID = 127

ID = 126

M2A

Termination

Jumper

Installed

ID = 128

M2A

Termination

Jumper

Not Installed

M2A

Termination

Jumper

Not Installed

ID = 1

Figure 14: Multiple M2As in a Two-Branch Configuration

ID = 4

ID = 127

M2A

Termination

Jumper

Installed

RS-485

ID = 128

Up to 128 M2As can be connected without a repeater

Modbus

Master

M2A

Termination

Jumper

Not Installed

M2A

Termination

Jumper

Not Installed

M2A

Termination

Jumper

Not Installed

M2A

Termination

Jumper

Not Installed

ID = 3

ID = 2

M2A

Termination

Jumper

Installed

ID = 1

RS-485

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Summary of Contents for 65-2670-XX-04

Page 1: ...RKI Instruments Inc www rkiinstruments com 65 2670 XX 04 M2A Transmitter Operator s Manual Part Number 71 0518 Revision D Released 6 24 21...

Page 2: ...Periodic calibration and maintenance of the gas monitor is essential for proper operation and correct readings Please calibrate and maintain this instrument regularly Frequency of calibration depends...

Page 3: ...replacement costs local repair costs transportation costs or contingent expenses incurred without our prior approval THIS WARRANTY IS EXPRESSLY IN LIEU OF ANY AND ALL OTHER WARRANTIES AND REPRESENTAT...

Page 4: ...9 Internal Description 12 Chapter 3 Installation Startup 16 Overview 16 Mounting the M2A Transmitter 16 Wiring the M2A Transmitter 18 Start Up 21 Chapter 4 Operation 24 Overview 24 Normal Operation 24...

Page 5: ...8 Replacing Components of the Detector 41 Chapter 8 RS 485 Modbus Output 44 Overview 44 Wiring the M2A in a Modbus System 44 Using the M2A in a 4 wire Modbus System 48 Modbus Mode 48 Supported Modbus...

Page 6: ...is visible through the window in the cover front face and provides a 4 20 mA signal which indicates the target gas reading for use by a gas monitoring controller recording device or programmable contr...

Page 7: ...pm 35 ppm 300 ppm Chlorine 0 3 00 ppm 0 50 ppm 1 00 ppm Chlorine 0 5 00 ppm 0 50 ppm 1 50 ppm Chlorine 0 10 0 ppm 1 0 ppm 3 0 ppm Chlorine Dioxide 0 1 00 ppm 0 10 ppm 0 30 ppm Chlorine Dioxide 0 3 00...

Page 8: ...G When using the M2A you must follow the instructions and warnings in this manual to assure proper and safe operation of the M2A and to minimize the risk of personal injury Be sure to maintain and per...

Page 9: ...ituations where the detector needs to be installed at an inaccessible location The detector junction box can be installed at the inaccessible location and the M2A junction box can be installed in a mo...

Page 10: ...ver allows you to access the interior of the junction box Detector Junction Box The detector junction box is intended to be installed remotely from the M2A junction box The detector is factory install...

Page 11: ...the detector cap to access the plug in sensor for maintenance or replacement A cap gasket seals the interface between the housing and cap Plug In Sensor The sensor is secured within the detector asse...

Page 12: ...he detection range and an RS 485 Modbus output signal The 4 20 mA signal may be used by a recording device gas monitor controller or programmable controller The Modbus output may be used to connect th...

Page 13: ...o the M2A See Wiring the M2A Transmitter on page 18 for all wiring procedures related to M2A Modbus Terminal Strip The Modbus terminal strip is a three position plug in style terminal strip and is the...

Page 14: ...minal PCB by lining up its three spacing standoffs with the banana jacks in the terminal PCB mounting standoffs and pushing it onto the banana jacks The jacks retain the control PCB OLED Display The O...

Page 15: ...5 Fail LED The fail LED turns on when the M2A is experiencing a fail condition A fail condition can be caused by a detector failure or low detector signal Alarm 1 LED The alarm 1 LED is on when the M...

Page 16: ...cedures The site should be easily accessible For the detector junction box select a site where the target gas is likely to be found first For lighter gases mount the detector near the ceiling for heav...

Page 17: ...exible tubing on one end to connect to the calibration adapter splash guard Route the Teflon tubing to an accessible area that is close to the M2A junction box Use the flexible tubing on the other end...

Page 18: ...technique 8 Guide a two conductor shielded cable or two wires in conduit through the top conduit hub of the detector junction box To make wiring more convenient use wire colors that correspond to the...

Page 19: ...cable shield s drain wire disconnected and insulated at the detector junction box You will connect the opposite end of the cable s drain wire to the M2A junction box s chassis earth ground 14 Reinstal...

Page 20: ...r three conductor shielded cable or two or three wires in conduit for connections to the power signal terminal strip depending on whether or not the signal S terminal is used The S terminal has a 4 20...

Page 21: ...tions are correct and secure 3 Turn on the incoming power 4 If necessary turn on the controller or other monitoring device that is connected to the M2A 5 The OLED display will indicate the firmware ve...

Page 22: ...s instead of pushing the control switch buttons To actuate a magnetic switch and perform the same operation as pressing a control switch button touch the magnet in the end of the magnetic wand to the...

Page 23: ...he top display line and the current gas reading will be on the bottom display line 4 Press and release the ENTER button The M2A will perform a zero operation and the display will indicate SPAN w Cal G...

Page 24: ...mation Screen displays the M2A s operating voltage and firmware and hardware information To display the Information Screen do the following 1 Press and hold the DOWN NO button for 3 seconds The Inform...

Page 25: ...ue to indicate this until Calibration Mode is entered and a calibration is performed In this situation the signal output will be fixed at 3 5 mA from the time Gas Type Mode is entered until the M2A is...

Page 26: ...es with the ALARM 1 message Table 4 Visual and Audible Alarm Indications Condition Cause Visual Indication s Alarm 11 Increasing gas reading at or above the alarm 1 setpoint A1 LED is on Gas reading a...

Page 27: ...ng alternates with the ALARM 2 message The alarm 2 relay energizes If the M2A is in both an alarm 1 and alarm 2 condition both the A1 and A2 LEDs will be on the gas reading will alternate with the ALM...

Page 28: ...low power condition the M2A is not an active gas monitor When the M2A senses a low power condition it alerts you as follows The F LED turns on The message LowPower is indicated on the top line of the...

Page 29: ...A Parameters 1 While in normal operation simultaneously press and hold the UP YES and ENTER buttons for 5 seconds to enter Configuration Mode Release the buttons when the following screen appears 2 If...

Page 30: ...off delay 0 sec The amount of time the M2A delays turning off the alarm 1 circuit once an alarm 1 condition passes This parameter appears only if the alarm 1 relay reset setting is set to SELF RST It...

Page 31: ...rom 1 15 minutes and in 15 minute increments from 15 60 minutes ZeroSupp 2 ppm The zero suppression feature helps prevent jumpy readings near the fresh air reading For example if the zero suppression...

Page 32: ...1 While in normal operation or during the warm up sequence press and hold the UP YES and DOWN NO buttons for five seconds Release them when the following screen appears 2 If you want to exit Gas Type...

Page 33: ...move to the next one Use the UP YES and DOWN NO buttons to adjust a setting See Chapter 5 Configuration Mode on page 29 for a complete description of Configuration Mode 7 When you have reviewed and a...

Page 34: ...button for 5 seconds to enter Calibration Mode but since a calibration is required only a momentary push is needed to enter Calibration Mode after changing the gas type 11 See Calibration on page 38 f...

Page 35: ...mptoms probable causes and recommended action for problems you may encounter with the M2A NOTE This troubleshooting guide describes M2A problems only If the M2A is connected to a controller see the co...

Page 36: ...perly shielded See Wiring the M2A Transmitter on page 18 2 Verify that the detector wiring is correct and secure 3 Increase the filter setting in Configuration Mode 4 Increase the zero suppression set...

Page 37: ...for this operation 4 Use the flexible tubing coming from the calibration adapter splash guard to connect the regulator to the calibration adapter splash guard 5 Turn the regulator s on off knob count...

Page 38: ...ing normally until the M2A is in normal operation again NOTE The detector must be calibrated with a gas concentration between 10 and 100 of the channel s full scale value ie a 0 500 ppm NH3 detector m...

Page 39: ...re is completed Materials 0 25 LPM fixed flow regulator CAUTION Using the 0 5 LPM regulator that is normally recommended for M2As will result in an inaccurate calibration zero air cylinder if you susp...

Page 40: ...will continue to display the minimum gas response on the display and retain the response level in its memory 10 Press and release the ENTER button The M2A will perform a fresh air adjustment and the...

Page 41: ...ed at 3 5 mA and the relays will remain in their non alarm state to avoid unwanted alarms while the calibration gas clears from the detector At the end of the 1 minute period the REMOVE CAL GAS messag...

Page 42: ...efore you continue with the next step For ClO2 Allow the replacement sensor to warm up for 2 3 hours before you continue with the next step 12 Calibrate the transmitter as described in the Calibration...

Page 43: ...tor junction box then screw the mounting threads of the detector into the conduit hub If necessary for environmental conditions apply thread sealant or Teflon tape to the hub and or detector threads t...

Page 44: ...addresses 1 247 The M2A s line driver provides for up to 128 M2As to be connected together without the need for a repeater Figure 13 Figure 14 below illustrate typical M2A wiring configurations If mor...

Page 45: ...on 5 wires are used for wiring the M2A into a Modbus system Figure 11 also illustrates typical alarm device wiring The ground jumper must be removed in this wiring configuration Adding an M2A to an Ex...

Page 46: ...the Modbus controller is omitted Instead the Common terminal on the Modbus controller is connected to the of the 24 VDC power supply The ground jumper must be installed in this wiring configuration Ad...

Page 47: ...emoved see Figure 13 Figure 14 below Figure 13 Multiple M2As in a Daisy Chain Configuration ID 125 Modbus Master Up to 128 M2As can be connected without a repeater RS 485 RS 485 M2A Termination Jumper...

Page 48: ...tically returns to normal operation NOTE If the M2A returns to normal operation because of a time out it enters a warm up period just as it does when it is first turned on 1 While in normal operation...

Page 49: ...normal operation NOTE All M2As on a Modbus network must be configured with the same baud rate and parity and each M2A must have a unique slave ID For an M2A to participate on a network the ENABLED DIS...

Page 50: ...eading with Sign Decimal Point Bit Field Assignments Bit s Value Field 15 Sign of Reading 0 Positive 1 Negative 14 13 Format of Reading 0 XXX no decimal point 1 XX X 2 X XX 3 XXX 12 0 Numerical value...

Page 51: ...1 Register 14 Register 14 is the alarm 2 set point The decimal point location is the same as specified in Register 1 8 Fail Status 0 Fail Not Asserted 1 Fail Asserted 7 6 Alarm 2 Status 0 No Alarm 1 U...

Page 52: ...ized Register 25 Register 25 is the alarm 1 relay reset 0 Latching 1 Self Resetting Register 26 Register 26 is the alarm 1 ON delay Integer values are in seconds Register 27 Register 27 is the alarm 1...

Page 53: ...er 36 is calibration month upper byte and day lower byte This is zero based e g January 0 and the 1st 0 Register 37 Register 37 is the calibration year Register 38 Register 38 is the calibration outco...

Page 54: ...alarm condition For a complete description of Function Code 16 see Appendix C Function Code 16 Registers on page 60 Register 16 Register 16 performs the same function as the ENTER button on the M2A It...

Page 55: ...CLO2 65 2302 CLO2 3 and 65 2303 CLO2 5 detectors 65 2053 01 CT 7 Series plug in sensor 0 500 ppm NH3 with membrane for 65 2302 NH3 500 detector 65 2054 01 CT 7 Series plug in sensor 0 75 0 ppm 0 100...

Page 56: ...m 81 0192RK 02 Calibration cylinder 2 ppm Cl2 in nitrogen 58 liter 81 0192RK 04 Calibration cylinder 2 ppm Cl2 in nitrogen 34 liter aluminum 81 1050RK 25 Regulator fixed flow 0 25 LPM with gauge and k...

Page 57: ...Button Quick Reference Chart Mode Entered or Function Performed Button Combination Adjustable or Viewable Parameters Alarm Reset Press and Release ENTER n a Show Information Screen Press and Hold DOWN...

Page 58: ...PWR SIG terminal strip connections and one or more relays are used route the connec tions to the M2A in conduit Use shielded cable in the conduit for the PWR SIG connections and unshielded cable or i...

Page 59: ...PLC and DCS Device Wiring S PWR SIG Alarm 1 Alarm Device Fail Alarm Device Alarm Device Power Typical Alarm Wiring Shown A B C RS 485 4 20 mA In S 24 VDC 24 VDC 24 VDC Power Supply 24 VDC Alarm 2 Alar...

Page 60: ...Normally De Energized 1 Normally Energized Register 4 Register 4 is the alarm 1 relay reset 0 Latching 1 Self Resetting Register 5 Register 5 is the alarm 1 ON delay Integer value is in seconds Regis...

Page 61: ...5 second increments Register 15 Register 15 is the calibration timeout Value is in minutes 5 10 15 20 25 or 30 Register 16 Register 16 is explained in Supported Modbus Functions in the M2A manual Regi...

Page 62: ...ransmitter Operator s Manual 62 Register 20 Register 20 is the AutoZero Disable 0 AutoZero Enabled 1 AutoZero Disabled Register 21 Register 21 is the Remote Configuration Register 0 No Remote Configur...

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