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

Recommended Modbus Wiring

The recommended Modbus wiring for the M2A is illustrated in Figure 10 below. In this configuration, 5 wires
are used for wiring the M2A into a Modbus system. Figure 10 also illustrates typical alarm device wiring. The
ground jumper must be removed in this wiring configuration.

Figure 10: Recommended Modbus Wiring

Adding an M2A to an Existing M2 Modbus Installation with Recommended 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 be removed.

Alternate Modbus Wiring For Existing Installations

Although the wiring shown in Figure 10 is recommended, it is possible to wire the M2A into a Modbus system
with only 4 wires in situations where a pre-existing system is being replaced and wiring is already in place. This
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 11 below for this wiring configuration. In this configuration, the wire between the “C”
terminal on the M2A and the Common terminal on 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.

Figure 11: Alternate Modbus Wiring

Power Supply

Remove Ground Jumper

10-30 VDC

-

+

Modbus Controller

Input

Terminals

D0

D1

Common

See

Detector

Wiring

To

Additional

M2As

C

N

C

NO

AL

A

R

M

1

C

N

C

NO

AL

A

R

M

2

C

N

C

NO

FA

IL

-

S

+

A

B

C

RS

4

8

5

PW

R

/S

IG

R

W

G

B

LE

L

-

S

+

A

B

C

RS

4

8

5

PW

R

/S

IG

R

W

G

B

LE

L

C

N

C

NO

AL

A

R

M

1

C

N

C

NO

AL

A

R

M

2

C

N

C

NO

FA

IL

Remove

Ground

Jumper

See

Detector

Wiring

Power Supply

10-30 VDC

-

+

To

Additional

M2As

C

N

C

NO

AL

A

R

M

1

C

N

C

NO

AL

A

R

M

2

C

N

C

N

O

FA

IL

See

Detector

Wiring

-

S

+

A

B

C

RS

4

8

5

PW

R

/S

IG

R

W

G

B

LE

L

-

S

+

A

B

C

RS

4

8

5

PW

R

/S

IG

R

W

G

B

LE

L

C

N

C

NO

AL

A

R

M

1

C

N

C

NO

AL

A

R

M

2

C

N

C

N

O

FA

IL

D1

Modbus Controller

Input

Terminals

D0

Common

See

Detector

Wiring

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Содержание 65-2661RK-XX-04

Страница 1: ...RKI Instruments Inc www rkiinstruments com 65 2661RK XX 04 M2A Transmitter Operator s Manual Part Number 71 0426 Revision E Released 8 28 20...

Страница 2: ...h 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 depend...

Страница 3: ...or 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 REPRESENT...

Страница 4: ...n 8 Internal Description 11 Chapter 3 Installation Startup 15 Overview 15 Mounting the M2A Transmitter 15 Wiring the M2A Transmitter 17 Start Up 21 Chapter 4 Operation 23 Overview 23 Normal Operation...

Страница 5: ...36 Calibration 37 Replacing Components of the Detector 39 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 S...

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: ...1 volume 0 1 volume 1 volume Alarm 1 2 000 ppm 2 500 ppm 0 50 volume 50 0 volume 100 volume Alarm 2 5 000 ppm 5 000 ppm 3 00 volume 50 0 volume 100 volume Construction housing Explosion proof Junction...

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: ...to view the OLED display and use the magnetic wand to actuate the magnetic control switches so you can perform non intrusive calibration Removing the cover allows you to access the interior of the ju...

Страница 10: ...membrane on the outside of the cap face keeps water and particulates away from the sensor face behind the cap Unscrew the detector cap to access the plug in sensor for maintenance or replacement A ca...

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 17 for all wiring procedures related to M2A Modbus Terminal Strip The Modbus terminal strip is a three position plug in style termi...

Страница 13: ...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 5 Control...

Страница 14: ...e 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...

Страница 15: ...perform start up maintenance and calibration procedures The site should be easily accessible Mount the detector junction box near the floor where CO2 is likely to be found first 2 The junction boxes s...

Страница 16: ...e 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 Chapter 9 Parts List on page...

Страница 17: ...uit hub of the detector junction box To make wiring more convenient use wire colors that correspond to the detector wire colors red white green and black 8 Connect the wires to the terminal block in t...

Страница 18: ...responding 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 detector junction box You will con...

Страница 19: ...nections 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 to the power signal ter minal strip...

Страница 20: ...e junction box 4 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 available chassis ground...

Страница 21: ...und of CO2 in air of typically 300 600 ppm 0 03 0 06 volume it is necessary to use a calibration kit with a 100 nitrogen cylinder to set the zero signal of an M2A with a low range detector 0 5000 ppm...

Страница 22: ...d the current gas reading will be on the bottom display line 4 Screw the 100 N2 cylinder into the fixed flow regulator 5 Use the flexible tubing coming from the calibration adapter splash guard to con...

Страница 23: ...ng in a fresh air environment The high range detectors 0 50 volume and 0 100 volume detectors will not display a reading in fresh air Information Screen The Information Screen displays the M2A s opera...

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: ...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 a...

Страница 26: ...on Fail Condition Indications The M2A indicates a fail condition for any of the following The detector wiring is disconnected or incorrectly connected The display reading is 10 of full scale or lower...

Страница 27: ...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 will begin its warm up sequence 3 Ve...

Страница 28: ...ons when the following screen appears 2 If you want to exit Configuration Mode press and release the DOWN NO button and the M2A will return to normal operation If you want to continue in Configuration...

Страница 29: ...ding at which the M2A initiates an alarm 2 condition ALARM 2 activation Increase Indicates if the alarm 2 circuit is activated by gas readings increasing Increase or decreasing Decrease to the ALARM 1...

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 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 Typ...

Страница 32: ...pressing the ENTER button display will ask SAVE IT YES NO 8 To save the configuration settings press and release the UP YES button The display will indicate Config Saved and the M2A will begin its war...

Страница 33: ...n calibrating an M2A after changing the gas type the M2A will not ask if you want to calibrate or whether you want to perform a fresh air adjustment span adjustment or zero adjustment Since a complete...

Страница 34: ...Troubleshooting The troubleshooting guide describes symptoms probable causes and recommended action for problems you may encounter with the M2A NOTE This troubleshooting guide describes M2A problems...

Страница 35: ...hielded See Wiring the M2A Transmitter on page 17 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...

Страница 36: ...calibration adapter splash guard 5 Turn the regulator s on off knob counterclockwise to open the regulator Gas will begin to flow Take note of the time or start a stopwatch 6 When you first start to n...

Страница 37: ...h a CO2 concentration between 500 and 5 000 ppm NOTE While in the calibration program if there is no switch activity for the calibration time out period the unit will return to normal operation See Vi...

Страница 38: ...tion Adjusting the Span Setting 4 Screw the zero air cylinder into the fixed flow regulator 5 Use the flexible tubing coming from the calibration adapter splash guard to connect the regulator to the c...

Страница 39: ...ove it now to avoid unwanted alarms During this 1 minute period the signal output will remain fixed at 3 5 mA and the relays will remain in their non alarm state to avoid unwanted alarms while the cal...

Страница 40: ...ue with the next step 10 Calibrate the detector as described in Calibration on page 37 Replacing the IR CO2 Detector NOTE In most cases it is only necessary to replace the IR CO2 plug in sensor 1 Turn...

Страница 41: ...e 13 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: ...his 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 11 below for this wiring configuration In this configu...

Страница 43: ...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 12 Figure 13 below Figure 12 Multiple M2As...

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: ...unction Code 16 see Appendix C Function Code 16 Registers on page 56 Register 16 Register 16 performs the same function as the ENTER button on the M2A It is useful for remotely silencing alarms With t...

Страница 51: ...50 volume 61 0198RK 10 Infrared CO2 detector 0 100 volume 61 5040RK 01 CO2 replacement plug in sensor 0 9 000 ppm 61 5040RK 02 CO2 replacement plug in sensor 0 5 000 ppm 61 5040RK 03 CO2 replacement...

Страница 52: ...ter 81 1050RK Regulator with gauge and knob 0 5 liter minute continuous flow for 17 liter and 34 liter steel calibration cylinders cylinders with external threads 81 1051RK Regulator with gauge and kn...

Страница 53: ...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 54: ...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 55: ...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 56: ...0 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 Regi...

Страница 57: ...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 Reg...

Страница 58: ...2A Transmitter Operator s Manual 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 Configu...

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