Danfoss DGS-SC User Manual Download

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Danfoss Gas Sensor

Type DGS-SC and DGS-IR

with MODBUS

Installation and Operation Guide

ADAP-KOOL® Refrigeration Control System

Summary of Contents for DGS-SC

Page 1: ...Danfoss Gas Sensor Type DGS SC and DGS IR with MODBUS Installation and Operation Guide ADAP KOOL Refrigeration Control System ...

Page 2: ...onnection and diagram 7 4 2 Jumper Configurations 10 4 3 Adjusting the Alarm Setpoint 11 4 4 System integration 12 5 Operation and Stabilisation 13 6 Functional Tests and Calibration 14 6 1 Introduction 14 6 2 Bump Testing 15 6 3 Calibration Overview 16 6 4 Calculating Calibration Voltage 16 6 5 Calibrating Semiconductor SC Sensors 16 6 6 Calibrating Infrared IR Sensors 16 6 7 Calibration of alarm...

Page 3: ...ing Red LED ON Green LED OFF Fault State 0 0 5V 1 5V 0 1V 2 10V 0 2mA 4 20mA Analogue Outputs 0 5V 1 5V 0 10V 2 10V 4 20mA Digital Outputs 1 Relay SPDT Failsafe configured by Modbus or by product selection 1 Amp 24V A C D C 120V A C Configurable delay by Modbus or by jumper configuration 0 1min 5min 10min IP Enclosure rating IP 41 or IP 66 Temperature Rat ings IP 41 20 C to 50 C 4 F to 122 F IP 66...

Page 4: ...he ceiling pro vided there is no possibility of a thermal layer trapped under the ceiling preventing gas from reaching the sensor NOTE At very low temperatures e g refrigerated cold store am monia gas becomes heavier than air With similar density or miscible gases e g CO2 sensors should be mounted about head high about 1 5 m 5 ft However with CO2 in a machinery room it is recommended to mount it 0...

Page 5: ...heir sensors mounted low e g at less than bed height in the case of an hotel or other similar Category Class A spaces Ceilings or other voids if not sealed are part of the occupied space CAUTION Monitoring ceiling voids in a hotel room would not strictly comply with EN378 Best practice installation includes installing the gas detector at a height below the room occupants E g in a hotel room this i...

Page 6: ...ounting DGS Modbus Standard Housing 50 mm 7 5 m m IP66 with Splashguard Splashguard IP66 Airflow Duct Mount Housing mounting slots 9mm long x 6mm wide use 5mm 6mm screws mounting measurements 2 3 4 IP66 Housing with Remote Sensor Head M42 thread 5 mounting slots 9mm long x 6mm wide use 5mm 6mm screws ...

Page 7: ...ached switch or circuit breaker as means of disconnection NOTE Connect monitor power and signaling terminals us ing wiring that complies with local electrical codes or regulations for the intended application NOTE This instrument can be equipped with a semicon ductor sensor for the detection of refrigerant com bustible or VOC gases Semiconductor sensors are not gas specific and respond to a variet...

Page 8: ...IGNAL SW1 SW2 0 1 2 3 4 5 6 7 8 9 A B C D E F 0 1 2 3 4 5 6 7 8 9 A B C D E F Danfoss 80Z730 10 Alarm P1 J4 Reset TP1 Alarm Delay J5 J6 SEMICONDUCTOR SC SENSOR PC BOARD GREEN LED RED LED P4 P2 Zero 4 20mA TP2 Vs P3 Span TP3 0V J7 J8 J9 J10 CN4 0 0 1 2 5 10 5 10 G _ MODBUS VOLTS Audible Alarm J3 Addressing AC Select J1 CN1 CN2 CN3 DC Select 0V V 0V V I Power Supply Output Signal Relay Out N O COM N...

Page 9: ...inal block CN2 positions 0V and V or I for voltage or current respectively Connect 4 20mA at CN2 positions 0V and I Connect voltage output at CN2 positions 0V and V Alarm relay The digital alarm output signal is connected at connector block CN3 The alarm relay may be operated with or without fail safe function When the fail safe function is enabled the relay will give an alarm if the power is disc...

Page 10: ...1 for details Reset J4 This is a jumper used for changing the Modbus communication speed See section 4 4 for details on system integration Time Delay J5 J6 A time delay is available to avoid false alarms from the buzzer and relay This is set with jumpers The default delay is 0 minutes The max setting via jumpers is 10 minutes See Figure 1 for jumper locations Or the time delay is programmed via Mo...

Page 11: ...the alarm point at 100 ppm Voltage 100 ppm ___5 V____ 1000 ppm 0 5 V So the alarm voltage setting is 0 5 Volts NOTE The output changes when changing P1 It does not change when changing the Modbus value The alarm setpoint may be changed physically via the potentiom eter P1 see below or through the Modbus interface see section 7 If the Modbus setting takes a value different than 0 zero the Modbus se...

Page 12: ...the least significant portion of the address SW2 scales the addresses by a factor of 16 the most significant portion of the address ADDR 16 x SW2 SW1 Example 40 16 x 2 8 SW1 Least Significant Hex Character 0 F 0 15 SW2 Most Significant Hex Character 0 F 0 15 ADDR SW2 SW1 1 0 1 2 0 2 3 0 3 9 0 9 10 0 A 11 0 B 15 0 F 16 1 0 246 6 F 247 7 F See appendix B for complete list of all address NOTE Address...

Page 13: ...he output for example 0 10V or as other wise configured When the output settles around zero the sensor is stabilised In exceptional circumstances the process can take up to 24 hours or more Alarm condition In alarm condition e g high gas level the green LED stays on the red LED will be on the buzzer operates if it has not been disabled and after a delay if this option has been selected the relay o...

Page 14: ...ppropriate use of the unit IMPORTANT Before testing the sensors on site the DGS Modbus must have been powered up and allowed to stabilise See section 5 IMPORTANT The testing and or calibration of the unit must be carried out by a suitably qualified technician and must be done in accordance with this manual in compliance with locally applicable guidelines and regulations Suitably qualified operator...

Page 15: ...nductor sensor is exposed to a sub stantial gas leak the sensor should be zero calibrated and bump tested and replaced if necessary NOTE To test the audible alarm and or relay function check the delay is set at zero and expose to gas You can mute the audible alarm by removing jumper J3 Step Bump Testing Using Calibration Gas Cylinders 1 Remove the enclosure lid of the gas detector not in an exhaus...

Page 16: ... calibrate with a gas close to the alarm set point Example For a sensor range of 0 1000 ppm and a cylinder of the target gas at 800 ppm Voltage Target Gas Value _____5 V_____ Sensor Range Voltage 800 ppm ___5 V____ _ 1000 ppm 4 V So the output voltage signal should be adjusted to 4V For R449A only This gas is nonlinear above 500ppm Calibration must be done with a 500 ppm gas Any readings above 500...

Page 17: ...t param eter and presented zero is overwritten It is not possible to adjust the alarm limit below the actual warning limit It is not possible to adjust the warning limit above the actual alarm limit If this is attempted the value is considered invalid and ignored Critical alarm indication Common indication of alarms any alarms active excl warnings The indication is given as soon as the alarm condi...

Page 18: ...hat the detector requires testing The Reset Cal is used to reset both the alarm and the Burning Hours timer Burning hours Status of the sensor warm up period Depending on the sensing technology of the actual DGS unit it will have a warm up period of up to 5 minutes until the measurements are accurate 0 Ready 1 Warming Up Startup flag Reset calibration counter and warning Clears calibration due war...

Page 19: ...ng s 1 Alarm s or warning s active 0 1 0 Common errors Alarm limit in 0 0 100 0 0 0 Alarm limit Alarm limit in ppm 0 FS2 0 ppm Alarm limit ppm High alarm delay in minutes if set to 0 hardware jumper con figuration is used hardware configured delay will be shown If set to value software alarm delay is used 0 10 0 min Alarm delay When set to 1 the alarm relay and sounder are reset to no alarm indica...

Page 20: ...s Manual control of Relays Automatically falls back to Off after 10 min 0 1 0 Maunal Control Status of the high alarm relay 0 No alarm signal 1 alarm signal 0 1 0 Alarm Relay Status of the buzzer 0 inactive 1 active 0 1 0 Sounder Status of the red LED 0 off 1 on 0 1 0 Red LED Status of the green LED 0 off 1 on 0 1 0 Green LED Alarms Limit alarm 0 Alarm not active 1 Alarm gas limit exceeded 0 1 0 L...

Page 21: ...s RS8HJ102 21 Danfoss ADAP KOOL 2016 12 8 Accessories Accessories for calibration Code no Calibration kit excl gas 080Z2296 110l cylinder with 10 000 ppm CO2 080Z2297 110l cylinder with 100 N2 080Z2298 110l cylinder with 5 000 ppm CO2 080Z2299 ...

Page 22: ...chieve a zero measurement in an environment with gas typically CO2 Do a zero adjustment with a zero gas and a re calibration Alarms in the absence of a leak If you experience alarms in the absence of a leak try setting an alarm delay Perform a bump test to ensure proper operation The zero measurement drifts The DGS SC sensor technology is sensitive to the environment temperature moist cleaning age...

Page 23: ... 3800 3800 n a n a n a n a 4000 4000 n a n a n a n a 4400 4400 n a n a n a n a 4800 4800 n a n a n a n a 5000 5000 2500 n a n a n a 5400 5400 2700 n a n a n a 5800 5800 2900 2578 n a n a 6000 6000 3000 2667 n a n a 6400 6400 3200 2844 n a n a 6800 6800 3400 3022 n a n a 7000 7000 3500 3111 n a n a 7400 7400 3700 3289 n a n a 7800 7800 3900 3467 n a n a 8000 8000 4000 3556 n a 2548 8400 8400 4200 3...

Page 24: ...44 C 2 45 D 2 46 E 2 47 F 2 48 0 3 49 1 3 50 2 3 51 3 3 52 4 3 53 5 3 54 6 3 55 7 3 56 8 3 57 9 3 58 A 3 59 B 3 60 C 3 Ad SW1 SW2 61 D 3 62 E 3 63 F 3 64 0 4 65 1 4 66 2 4 67 3 4 68 4 4 69 5 4 70 6 4 71 7 4 72 8 4 73 9 4 74 A 4 75 B 4 76 C 4 77 D 4 78 E 4 79 F 4 80 0 5 Ad SW1 SW2 81 1 5 82 2 5 83 3 5 84 4 5 85 5 5 86 6 5 87 7 5 88 8 5 89 9 5 90 A 5 91 B 5 92 C 5 93 D 5 94 E 5 95 F 5 96 0 6 97 1 6 ...

Page 25: ...y Power Green LED Visual Alarm Red LED Sounder Operating Relay Operating Remote Systems if connected to relay Check Analogue Output in Use e g 0 10V System Passed If system failed carry out a gas calibration See below System Passed If the DGS did not respond correctly and could not be recalibrated due to age exposure to gas etc then either the DGS or the sensor element should be replaced and recal...

Page 26: ...aterial Danfoss reserves the right to alter its products without notice This also applies to products already on order provided that such alternations can be made without subsequential changes being necessary in specifications already agreed All trademarks in this material are property of the respecitve companies Danfoss and Danfoss logotype are trademarks of Danfoss A S All rights reserved ...

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