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65-2661RK-03-04 M2A Transmitter Operator’s Manual

40

Adding an M2A to an Existing M2 Modbus Installation with Alternate Wiring

An M2A can be wired into an existing M2 Modbus system. The shape of the terminal PCB
will be different but the wiring connections are identical and the ground jumper on the
M2A must still remain installed.

Termination Jumper

The M2A includes a 2-pin termination header (see Figure 3 on page 7) 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 11 & Figure 12 below).

Figure 11: Multiple M2As in a Daisy Chain Configuration

Figure 12: Multiple M2As in a Two Branch 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

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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Содержание 65-2661RK-03-04

Страница 1: ...RKI Instruments Inc www rkiinstruments com 65 2661RK 03 04 M2A Transmitter Operator s Manual Part Number 71 0426 Revision 0 Released 11 28 17...

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: ...n 3 Internal Description 6 Chapter 3 Installation Startup 10 Overview 10 Mounting the M2A Transmitter 10 Wiring the M2A Transmitter 12 Start Up 16 Chapter 4 Operation 18 Overview 18 Normal Operation 1...

Страница 5: ...03 04 35 Chapter 8 RS 485 Modbus Output 38 Overview 38 Wiring the M2A in a Modbus System 38 Using the M2A in a 4 wire Modbus System 41 Modbus Mode 41 Supported Modbus Functions 43 Parts List 48 Append...

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 2 0 50 volume 3 00 volume Construction housing Explosion proof Junction Box NEMA 4 Area Classification Explosion proof for Class I Groups B C and D Sampling Method Diffusion Input Power 10 30 V...

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: ...Removing the cover 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 IR CO2 dete...

Страница 10: ...access the plug in sensor for maintenance or replacement A cap gasket seals the interface between the housing and cap Plug In CO2 Sensor The plug in sensor is secured in the detector assembly by the h...

Страница 11: ...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 12: ...r is factory wired to the M2A See Wiring the M2A Transmitter on page 12 for all wiring procedures related to M2A Modbus Terminal Strip The Modbus terminal strip is a three position plug in style termi...

Страница 13: ...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 Figure 4 Control P...

Страница 14: ...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 15: ...he 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 gases...

Страница 16: ...exible 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 48 f...

Страница 17: ...ite green and black NOTE Consult RKI Instruments Inc for cable lengths longer than 200 feet 8 Connect the detector leads to the terminal block in the detector junction box 9 Secure the detector juncti...

Страница 18: ...terminal Connect the wire corresponding to the detector s black wire to the LEL B terminal CAUTION If shielded cable is used leave the cable shield s drain wire disconnected and insulated at the detec...

Страница 19: ...e how to wire the M2A If Modbus connections will not be used and only the PWR SIG connections will be used use a two or three conductor shielded cable or two or three wires in conduit for connections...

Страница 20: ...unction 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 to an a...

Страница 21: ...on on page 33 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...

Страница 22: ...time out period see Viewing Changing M2A Parameters on page 23 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: ...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...

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 3 00 volume The gas rea...

Страница 30: ...ther than 0 0 such as 1 0 the M2A will display a reading of 0 0 for gas readings from 1 0 volume to 1 0 volume The zero suppression is settable from 0 to 6 of the detection range FILTER 5 secs The fil...

Страница 31: ...e 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 following screen appears 2 If you want to exi...

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 33 for calibration instructions NOTE When calibrating an M2A after changing the gas type the M2A will not...

Страница 34: ...void unwanted external alarm indications NOTE The following procedure assumes the use of a calibration kit which includes a calibration gas cylinder and a fixed flow regulator with an on off knob 1 Di...

Страница 35: ...d Action No Power The display backlight is off and the display screen is blank The power wiring is disconnected or misconnected The display cable is disconnected or misconnected 1 Verify that the wiri...

Страница 36: ...ndition continues contact RKI for further instruction Slow or No Response Difficult or Unable to Calibrate M2A responds slowly or does not respond to response test Unable to successfully set the fresh...

Страница 37: ...To determine the response time based on the length of tubing connected 1 Place the M2A into its calibration mode or disable external alarms 2 Note the current gas reading displayed at the M2A 3 Screw...

Страница 38: ...witch 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 M2A s glass cover directly above t...

Страница 39: ...rclockwise to open the regulator 7 Allow zero air to flow for the length of time determined in Determining Response Time on page 32 8 Turn the regulator knob clockwise to close the regulator 9 Unscrew...

Страница 40: ...he detector At the end of the 1 minute period the REMOVE CAL GAS message will stop appearing and the M2A will return to normal operation 10 Disconnect the calibration adapter splash guard s flexible t...

Страница 41: ...placement sensor to warm up for 5 minutes before you continue with the next step 10 Calibrate the detector as described in Calibration on page 33 Replacing the IR CO2 Detector NOTE In most cases it is...

Страница 42: ...04 M2A Transmitter Operator s Manual NOTE Allow the replacement detector to warm up for 15 minutes before you continue with the next step 11 Calibrate the replacement detector as described in Calibra...

Страница 43: ...re 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 networ...

Страница 44: ...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 configuration the wire be...

Страница 45: ...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 M2As...

Страница 46: ...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 47: ...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 48: ...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 49: ...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 50: ...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 51: ...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 52: ...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 53: ...32RK Termination and ground jumper 61 0198RK 03 Infrared CO2 detector 0 5 volume 61 5040RK 03 CO2 replacement plug in sensor 0 5 volume 71 0426 65 2661RK 03 04 M2A Transmitter Operator s Manual this d...

Страница 54: ...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 55: ...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 56: ...LC and DCS Device Wiring Alarm 1 Alarm Device Fail Alarm Device Alarm Device Power Typical Alarm Wiring Shown 4 20 mA In S 24 VDC 24 VDC 24 VDC Power Supply 24 VDC Alarm 2 Alarm Device See Modbus Wiri...

Страница 57: ...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 58: ...ygen 0 0 7 Oxygen Value must be an integer Any decimals are omitted Register 14 Register 14 is the noise filter Integer value is in seconds 0 60 in 5 second increments Register 15 Register 15 is the c...

Страница 59: ...be used to clear those flags Table 16 Register 19 Clear Change Flags Register 20 Register 20 is the AutoZero Disable 0 AutoZero Enabled 1 AutoZero Disabled Register 21 Register 21 is the Remote Config...

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