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65-2646RKS-SW M2A Transmitter Operator’s Manual

Chapter 2: Description

•

15

Status LEDs

The M2A includes five status LEDs that are located above the display (see Figure 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 M2A is experiencing an alarm 1 condition.

• Alarm 2 LED

The alarm 2 LED is on when the M2A is experiencing an alarm 2 condition.

• RX & TX LED’s

These LED’s indicate data being received (RX) and transmitted (TX) when the M2A’s
Modbus output is operating.

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Содержание 65-2646RKS-SW

Страница 1: ...RKI Instruments Inc www rkiinstruments com 65 2646RKS SW M2A Transmitter Operator s Manual Part Number 71 0601 Revision P1 Released 8 8 22...

Страница 2: ...death 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 de...

Страница 3: ...y indicates the full extent of our liability and we are not responsible for removal or replacement costs local repair costs transportation costs or contingent expenses incurred without our prior appro...

Страница 4: ...8 Internal Description 11 Chapter 3 Installation Startup 16 Overview 16 Mounting the M2A Transmitter 16 Wiring the M2A Transmitter 17 Start Up 20 Chapter 4 Operation 23 Overview 23 Normal Operation 2...

Страница 5: ...Replacing Components of the CO Detector 39 Chapter 8 RS 485 Modbus Output 42 Overview 42 Wiring the M2A in a Modbus System 42 Using the M2A in a 4 wire Modbus System 46 Modbus Mode 46 Supported Modbu...

Страница 6: ...play which 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 program...

Страница 7: ...Alarm Settings Alarm 1 Alarm 2 25 ppm 50 ppm 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: ...x The M2A s cast aluminum junction box is dust and weather resistant The junction box also protects the M2A and all connections made to it Use the three 3 4 NPT conduit hubs to mount the detector to t...

Страница 9: ...p cap gasket charcoal filter with rubber boot and the plug in sensor Figure 2 CO Detector Component Location Detector Housing Body The detector housing body protects the electronic components within t...

Страница 10: ...tly bonded to the cap Charcoal Filter and Rubber Boot The disc shaped charcoal filter is secured to the face of the CO sensor with a rubber boot The charcoal filter prevents interference gases hydroge...

Страница 11: ...tandoffs and rests on a thin layer of foam A banana jack is screwed into each of the standoffs and used for mounting the control PCB The terminal PCB converts the electrical output from the detector t...

Страница 12: ...put the S terminal does not have to be connected for the M2A to function The S terminal is used if you want to connect the 4 20 mA output signal to another device such as a gas monitoring controller c...

Страница 13: ...Chapter 8 RS 485 Modbus Output on page 42 for a description of using the M2A in a Modbus system Ground Jumper A two pin header with a jumper installed is located along the left side of the terminal P...

Страница 14: ...agnetic wand close enough to them to actuate them Although the magnetic switches have the same functions as the push button switches it is not practical to use them for operations other than calibrati...

Страница 15: ...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 M2A is experiencing an alarm 1 conditio...

Страница 16: ...disturbed Make sure there is sufficient room to perform start up maintenance and calibration procedures The site should be easily accessible Select a site where the target gas is likely to be found fi...

Страница 17: ...hanging while wiring is done If desired the control PCB may be disconnected from the cable and set aside while wiring 6 The detector leads are factory wired Verify that the detector leads are wired t...

Страница 18: ...er entering the junction box at the conduit ports 8 To maintain the explosion proof classification of the M2A junction box a conduit seal must be installed within 2 inches for Group B environments or...

Страница 19: ...e 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 individual wires for the relay connections M...

Страница 20: ...d for the PWR SIG connections connect the cable shield s drain wire to an available chassis ground at the gas monitoring controller recording device or programmable controller Start Up Introducing Inc...

Страница 21: ...fresh air to the detector and verify an accurate fresh air setting See the Calibration on page 36 for instructions on how to use a zero air cylinder when performing a fresh air adjustment Non Intrusi...

Страница 22: ...for 5 seconds to enter Calibration Mode Release the button when the following screen appears 2 Press and release the UP YES button to continue The display will indicate the target gas and CAL Mode fo...

Страница 23: ...n The Information 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...

Страница 24: ...guration Mode Gas Type Mode or Modbus Mode the signal output will be fixed at 3 5 mA until the M2A returns to normal operation If the M2A s input power decreases below 9 5 volts so that the M2A is in...

Страница 25: ...the alarm 1 setpoint press the ENTER button 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 ENTE...

Страница 26: ...it Resetting the alarm circuit turns off the A2 light resets the OLED display and de energizes the alarm 2 relay NOTE If the ENTER button is pressed while the M2A is in an alarm 2 condition the A2 LED...

Страница 27: ...d the input voltage is displayed on the bottom line of the OLED display The fail relay de energizes NOTE The low power alarm cannot be cleared using the ENTER button When the voltage increases to 10 0...

Страница 28: ...hold the UP YES and ENTER buttons for 5 seconds to enter Configuration Mode Release the buttons when the following screen appears 2 If you want to exit Configuration Mode press and release the DOWN N...

Страница 29: ...on passes This parameter appears only if the alarm 1 relay reset setting 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 mi...

Страница 30: ...rements from 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 sup...

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 follow...

Страница 32: ...d then the M2A will enter Configuration Mode automatically so that the parameter settings in Configuration Mode can be verified or changed 6 While in Configuration Mode press and release the ENTER but...

Страница 33: ...the display will indicate CAL NEEDED Since the gas type has been changed a successful calibration must be performed before the M2A can enter normal operation 10 Press and release the UP YES button to...

Страница 34: ...symptoms 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...

Страница 35: ...ly shielded 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 settin...

Страница 36: ...ing device during the calibration procedure The 4 20 mA output signal will freeze at 3 5 mA and all relays will remain in their non alarm state while the M2A is in Calibration Mode The output signal w...

Страница 37: ...reading and retain it in its memory until the fresh air adjustment procedure is completed When calibration gas is applied to the M2A during a span adjustment the M2A will freeze the display reading a...

Страница 38: ...inder into the fixed flow regulator 5 Turn the regulator knob counterclockwise to open the regulator 6 Allow zero air to flow for 2 minutes 7 Turn the regulator knob clockwise to close the regulator 8...

Страница 39: ...ssage REMOVE CAL GAS for 1 minute If the calibration gas has not been removed from the detector remove it now to avoid unwanted alarms During this 1 minute period the signal output will remain fixed a...

Страница 40: ...t to lose the cap gasket 3 Unplug and remove the CO sensor with the rubber boot and charcoal filter attached 4 Remove the rubber boot and charcoal filter from the old sensor 5 Remove the replacement s...

Страница 41: ...the color coded leads as you remove them 8 Unscrew the detector from the junction box 9 Guide the detector leads of the replacement detector through the bottom conduit hub of the junction box then sc...

Страница 42: ...47 unique slave 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 12 Figure 13 below illustrate typical M2A wiring confi...

Страница 43: ...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...

Страница 44: ...on 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 c...

Страница 45: ...ination jumper removed see Figure 12 Figure 13 below Figure 12 Multiple M2As in a Daisy Chain Configuration Figure 13 Multiple M2As in a Two Branch Configuration ID 125 Modbus Master Up to 128 M2As ca...

Страница 46: ...the M2A automatically 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 no...

Страница 47: ...M2A returns to 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...

Страница 48: ...or registers 1 2 is shown below in Table 10 Table 11 Table 10 Register 1 Numerical Reading with Sign Decimal Point Bit Field Assignments Bit s Value Field 15 Sign of Reading 0 Positive 1 Negative 14 1...

Страница 49: ...ail Not Asserted 1 Fail Asserted 7 6 Alarm 2 Status 0 No Alarm 1 Unacknowledged Alarm 2 Acknowledged Alarm 3 Unused Code 5 4 Alarm 1 Status 0 No Alarm 1 Unacknowledged Alarm 2 Acknowledged Alarm 3 Unu...

Страница 50: ...on is the same as specified in Register 1 Registers 15 19 Registers 15 19 are the Gas Name ASCII String NULL Terminated Registers 20 22 Registers 20 22 are the Gas Units String NULL Terminated Registe...

Страница 51: ...32 is the alarm 2 OFF delay Integer values are in seconds Register 33 Register 33 is zero suppression Toxics and LEL 0 6 of full scale Oxygen 0 0 7 Oxygen The decimal point location is the same as spe...

Страница 52: ...4 Not Enough Span 5 Negative Reading 6 Span Gas Value Is Not OK 7 Calculated Zero Is Too Low 8 Calculated Zero Is Too High 9 Zero Failure 10 Span Failure 11 Calibration Is Overscale 12 LEL Sensor Offs...

Страница 53: ...n For a complete description of Function Code 16 see Appendix C Function Code 16 Registers on page 58 Register 16 Register 16 performs the same function as the ENTER button on the M2A It is useful for...

Страница 54: ...nation and ground jumper 71 0601 65 2646RKS SW M2A Transmitter Operator s Manual this docu ment 81 0076RK 01 Zero air calibration cylinder 34 liter steel 81 0076RK 03 Zero air calibration cylinder 103...

Страница 55: ...Table 13 Control 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 Pr...

Страница 56: ...nal strip If the 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 unshie...

Страница 57: ...Figure 14 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 Al...

Страница 58: ...ay state 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 sec...

Страница 59: ...ression Toxics and LEL 0 6 Full Scale Oxygen 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 inc...

Страница 60: ...ster can be used to clear those flags Table 15 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 Remo...

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