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65-2640RK-05-04 M2A Transmitter Operator’s Manual

Chapter 7: Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Replacing the Combustible Gas Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Chapter 8: RS-485 Modbus Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Wiring the M2A in a Modbus System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Using the M2A in a 4-wire Modbus System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Modbus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Supported Modbus Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Appendix A: Control Button Quick Reference Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Appendix B: PLC and DCS Device Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Appendix C: Function Code 16 Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

(Appendix C available from RKI Instruments, Inc. Not included in manual as normally
provided with M2A detector head.)

Содержание 65-2640RK-05-04

Страница 1: ...RKI Instruments Inc www rkiinstruments com 65 2640RK 05 04 M2A Transmitter Operator s Manual Part Number 71 0406 Revision A Released 9 20 18...

Страница 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...

Страница 3: ...r 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 REPRESENTA...

Страница 4: ...8 Internal Description 10 Chapter 3 Installation Startup 14 Overview 14 Mounting the M2A Transmitter 14 Wiring the M2A Transmitter 16 Start Up 21 Chapter 4 Operation 23 Overview 23 Normal Operation 2...

Страница 5: ...8 RS 485 Modbus Output 41 Overview 41 Wiring the M2A in a Modbus System 41 Using the M2A in a 4 wire Modbus System 44 Modbus Mode 44 Supported Modbus Functions 46 Parts List 51 Appendix A Control Butt...

Страница 6: ...ch 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 co...

Страница 7: ...Alarm Settings Alarm 1 Alarm 2 10 LEL 50 LEL Construction housing Explosion proof Junction Box NEMA 4X Area Classification Explosion proof for Class I Groups B C and D Sampling Method Diffusion Input...

Страница 8: ...re 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 more readily ac...

Страница 9: ...nduit hub Three spacers installed on the back of the junction box controls the distance of the junction box from a mounting surface A ground boss near the top conduit hub provides an external earth gr...

Страница 10: ...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 the M2A to a Mo...

Страница 11: ...r is factory wired to the M2A See Wiring the M2A Transmitter on page 16 for all wiring procedures related to M2A Modbus Terminal Strip The Modbus terminal strip is a three position plug in style termi...

Страница 12: ...rminal 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 Figure 4 Control...

Страница 13: ...e 4 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...

Страница 14: ...s 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 heavier ga...

Страница 15: ...ible polyurethane tubing to the fitting at the bottom of the calibration adapter splash guard and route it to an accessible area that is close to the M2A junction box See the Parts List on page 51 for...

Страница 16: ...tion box A conduit seal which is normally required to maintain the junction box s hazardous location rating will also help to prevent water from entering through the top port NOTE Consult RKI Instrume...

Страница 17: ...corresponding to the detector s white wire to the LEL W terminal Connect the wire corresponding to the detector s green wire to the LEL G terminal Connect the wire corresponding to the detector s bla...

Страница 18: ...ctor junction box 15 Guide multi conductor shielded cable or cables or wires in conduit through the top conduit hub of the M2A junction box The number of cables or wires needed will depend on whether...

Страница 19: ...unction completely If the PWR SIG connections and one or more relays are used route the connections to the M2A in conduit Use shielded cable in the conduit for the PWR SIG connections and unshielded c...

Страница 20: ...e M2A junction box cover to the junction box 18 Make controller device and relay connections as appropriate If shielded cable is used for the PWR SIG connections connect the cable shield s drain wire...

Страница 21: ...on page 37 Verify that the M2A is in a fresh air environment environment known to be free of combustible or toxic gas vapors and of normal oxygen content 20 9 CAUTION If you suspect the presence of co...

Страница 22: ...time out period see Viewing Changing M2A Parameters on page 28 for instructions to change the calibration time out 1 While in normal operation press and hold the UP YES button for 5 seconds to enter...

Страница 23: ...ation 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 Informa...

Страница 24: ...peration If the M2A s input power decreases below 18 5 volts so that the M2A is in a low power alarm the signal output is fixed below 2 4 mA until the low power alarm is cleared If the M2A goes into a...

Страница 25: ...n to reset the alarm 1 circuit Resetting the alarm 1 circuit turns off the A1 LED resets the OLED display and de energizes the alarm 1 relay NOTE If the ENTER button is pressed while the M2A is in an...

Страница 26: ...the alarm 2 setpoint Fail Condition Fail Condition Indications The M2A indicates a fail condition for any of the following The detector wiring is disconnected or incorrectly connected The display read...

Страница 27: ...d the M2A will begin its warm up sequence Responding to a Low Power Condition 1 Determine and correct the cause of the low power condition 2 When the input power increases above 10 0 volts the M2A wil...

Страница 28: ...2A 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 I...

Страница 29: ...is set to SELF RST It can be set in 1 second increments from 0 60 seconds in 1 minute increments from 1 15 minutes and in 15 minute increments from 15 60 minutes ALARM 2 level 50 LEL The gas reading...

Страница 30: ...zero suppression is 2 0 LEL the M2A will display a reading of 0 LEL for gas readings from 2 LEL to 2 LEL It is settable from 0 to 6 of the detection range FILTER 5 secs The filter feature helps smooth...

Страница 31: ...when it is first turned on Selecting the Gas Type 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 follo...

Страница 32: ...for a complete description of Configuration Mode 7 When you have reviewed and accepted the last item in Configuration Mode by pressing the ENTER button display will ask SAVE IT YES NO 8 To save the c...

Страница 33: ...sh is needed to enter Calibration Mode after changing the gas type 11 See Calibration on page 37 for calibration instructions NOTE When calibrating an M2A after changing the gas type the M2A will not...

Страница 34: ...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 controlle...

Страница 35: ...ed See Wiring the M2A Transmitter on page 16 2 Verify that the detector wiring is correct and secure 3 Increase the filter setting in Configuration Mode 4 Increase the zero suppression setting in Conf...

Страница 36: ...Place the M2A into its calibration mode or disable external alarms 2 Note the current gas reading displayed at the M2A 3 Screw the regulator into the calibration cylinder Do not use a zero air cylinde...

Страница 37: ...fresh air zero setting adjust the span setting and return to normal operation WARNING The M2A is not an active gas monitoring device during the calibration procedure The 4 20 mA output signal will fre...

Страница 38: ...ustment procedure is completed Adjusting the Fresh Air Reading 1 While in normal operation press and hold the UP YES button for 5 seconds to enter Calibration Mode Release the button when the followin...

Страница 39: ...gas response on the display and retain the response level in its memory 7 Adjust the gas reading up or down to match the calibration gas cylinder concentration by using the UP YES and DOWN NO buttons...

Страница 40: ...hrough the bottom conduit hub of the detector junction box then screw the mounting threads of the detector into the conduit hub If necessary for environmental conditions apply thread sealant or teflon...

Страница 41: ...e 12 below illustrate typical M2A wiring configurations If more than 128 M2As need to be connected together RS 485 repeater s should be used such that no more than 128 M2As reside on any given network...

Страница 42: ...s should only be done if wiring for a system that is being replaced is already installed and it is not practical to run another wire See Figure 10 below for this wiring configuration In this configura...

Страница 43: ...led 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 11 Figure 12 below Figure 11 Multiple...

Страница 44: ...atically 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...

Страница 45: ...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 DI...

Страница 46: ...Reading 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...

Страница 47: ...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...

Страница 48: ...rm 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 OFF delay Integer values are in second...

Страница 49: ...y 0 and the 1st 0 Register 37 Register 37 is the calibration year Register 38 Register 38 is the calibration outcome Upper Gas Operation Lower Air Operation Calibration Outcome Codes 1 Sensor Missing...

Страница 50: ...of Function Code 16 request Appendix C from RKI Instruments Inc Register 16 Register 16 performs the same function as the ENTER button on the M2A It is useful for remotely silencing alarms With the M2...

Страница 51: ...Calibration cylinder 50 LEL hydrogen in air 103 liter 81 0004RK 01 Calibration cylinder 50 LEL propane in air 34 liter steel 81 0004RK 03 Calibration cylinder 50 LEL propane in air 103 liter 81 0007RK...

Страница 52: ...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 DOW...

Страница 53: ...he PWR SIG terminal strip connections and one or more relays are used route the connections to the M2A in conduit Use shielded cable in the conduit for the PWR SIG connections and unshielded cable or...

Страница 54: ...PLC and DCS Device Wiring Alarm Device Power Fail Alarm Device Alarm 1 Alarm Device 24 VDC 24 VDC Power Supply 24 VDC Typical Alarm Wiring Shown 24 VDC 4 20 mA In S Alarm 2 Alarm Device C NC NO ALARM...

Страница 55: ...lly 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 Register 6 Register 6 is the alarm...

Страница 56: ...lue is in minutes 5 10 15 20 25 or 30 Register 16 Register 16 is explained in Supported Modbus Functions in the M2A manual Register 17 Register 17 is the calibration month MSB and day LSB This is zero...

Страница 57: ...65 2640RK 05 04 M2A Transmitter Operator s Manual 57 Register 21 Register 21 is the Remote Configuration Register 0 No Remote Configuration 1 Reset Alarm...

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