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Danfoss VLT series, Design Manual

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Danfoss VLT series Design Manual Download Page 111

6. Application Examples

6.1.1. Start/Stop 

Terminal 18 = start/stop par. 5-10 [8] 

Start

Terminal 27 = No operation par. 5-12 [0] 

No

operation

 (Default 

coast inverse

Par. 5-10 

Digital Input

 = 

Start

 (de-

fault)

Par. 5-12 

Digital Input

 = 

coast in-

verse

 (default)

Illustration 6.1: Terminal 37: Available only with
Safe Stop Function!

6.1.2. Pulse Start/Stop 

Terminal 18 = start/stop par. 5-10 [9] 

Latched

start

Terminal 27= Stop par. 5-12 [6] 

Stop inverse

Par. 5-10 

Digital Input

 = 

Latched

start

Par. 5-12 

Digital Input

 = 

Stop in-

verse

Illustration 6.2: Terminal 37: Available only with
Safe Stop Function!

VLT

®

 HVAC Drive Design Guide

6. Application Examples

 MG.11.B2.02 - VLT

®

 is a registered Danfoss trademark 

 

111

6

Summary of Contents for VLT series

Page 1: ...PELV 44 Earth leakage current 45 Control with brake function 45 Mechanical brake control 47 Extreme running conditions 47 3 VLT HVAC Selection 49 Electrical Data 49 General Specifications 54 Peak Volt...

Page 2: ...s 110 Residual Current Device 110 6 Application Examples 111 7 RS 485 Installation and Set up 121 RS 485 Installation and Set up 121 FC Protocol Overview 124 Network Configuration 124 FC Protocol Mess...

Page 3: ...ure 86 Illustration 5 5 Terminals for mains and earthing 87 Illustration 5 6 How to connect to mains and earthing with disconnector A5 enclosure 87 Illustration 5 7 88 Illustration 5 8 Motor connectio...

Page 4: ...htening of terminals 85 Table 5 2 Non UL fuses 200 V to 500 V 91 Table 5 3 UL fuses 200 240 V 92 Table 5 4 UL fuses 380 600 V 92 Table 8 1 Alarm Warning code list 154 Table 8 2 Description of Alarm Wo...

Page 5: ...technical information about the drive and customer design and applications The VLT HVAC Drive Programming Guide MG 11 CX YY provides information on how to programme and includes complete parameter des...

Page 6: ...Thermal Relay ETR Frequency Converter FC Gram g Hertz Hz Kilohertz kHz Local Control Panel LCP Meter m Milli Henry Inductance mH Milliampere mA Millisecond ms Minute min Motion Control Tool MCT Nanof...

Page 7: ...asting stop Quick stop DC braking Stop and the Off key Group 2 Start Pulse start Reversing Start reversing Jog and Freeze output Motor fJOG The motor frequency when the jog function is activated via d...

Page 8: ...ca tion port FC port Preset Reference A defined preset reference to be set from 100 to 100 of the reference range Selection of eight preset references via the digital terminals Pulse Reference A pulse...

Page 9: ...ion compressors Digital Inputs The digital inputs can be used for controlling various functions of the frequency converter Digital Outputs The drive features two Solid State outputs that can supply a...

Page 10: ...PID controller maintains the desired speed pressure temperature etc by adjusting the out put frequency to match the varying load RCD Residual Current Device Set up You can save parameter settings in...

Page 11: ...sed for personal safety VT Characteristics Variable torque characteristics used for pumps and fans VVCplus If compared with standard voltage frequency ratio control Voltage Vector Control VVCplus im p...

Page 12: ...2 Introduction to VLT HVAC Drive VLT HVAC Drive Design Guide 12 MG 11 B2 02 VLT is a registered Danfoss trademark 2...

Page 13: ...W Be aware that there may be high voltage on the DC link even when the LEDs are turned off 2 1 2 Disposal Instruction Equipment containing electrical components may not be disposed of together with do...

Page 14: ...tion we specify which standards our products comply with We offer the filters presented in the specifications and provide other types of assis tance to ensure the optimum EMC result The frequency conv...

Page 15: ...laration of conformity in accordance with the EMC directive is issued The Design Guide offers detailed instructions for installation to ensure EMC correct installation Furthermore Danfoss specifies wh...

Page 16: ...damage the electronic components In such envi ronments mount the equipment in a cabinet with fresh air ventilation keeping aggressive gases away from the frequency converter An extra protection in su...

Page 17: ...is controlled by changing the rpm By reducing the speed only 20 from the rated speed the flow is also reduced by 20 This is because the flow is directly proportional to the rpm The consumption of ele...

Page 18: ...converter Pump characteristics Energy savings This figure compares power control via valves and without speed control with pressure control via a frequency convert er Pshaft Pshaft output Flow distrib...

Page 19: ...larger motors are started it is necessa ry in many countries to use equipment that limits the start up current In more traditional systems a star delta starter or soft starter is widely used Such moto...

Page 20: ...M S Energy Management system V A V Variable Air Volume Sensor P Pressure Sensor T Temperature 2 7 10 With a frequency converter The figure shows a fan system controlled by VLT HVAC Drive frequency co...

Page 21: ...for The Drive to Improving Constant Air Volume Ventilation Systems MN 60 B1 02 Cooling Tower Fan Ask for The Drive to Improving fan control on cooling towers MN 60 C1 02 Condenser pumps Ask for The D...

Page 22: ...gy and reduces the complexity of the installation Instead of creating an artificial pressure drop or causing a decrease in fan efficiency the frequency con verter decreases the speed of the fan to pro...

Page 23: ...itioning systems as the outside temperature varies as well as the number of people in the controlled zone changes different cooling require ments exist As the temperature decreases below the set point...

Page 24: ...temperature The frequency converters can also be used to turn the fan on and off as needed Several features of Danfoss HVAC dedicated drive the VLT HVAC Drive can be utilized to improve the performanc...

Page 25: ...fficient than air cooled chillers 2 7 19 The VLT solution Frequency converters can be added to condenser water pumps instead of balancing the pumps with a throttling valve or trimming the pump impelle...

Page 26: ...thods are com mon The first method uses a flow meter Because the desired flow rate is known and is constant a flow meter installed at the discharge of each chiller can be used to control the pump dire...

Page 27: ...vings and eases system control problems the true energy savings and control potential is realized by adding fre quency converters With the proper sensor location the addition of frequency converters a...

Page 28: ...rol The output of the motor control is then limited by the maximum frequency limit Select Closed loop 3 in par 1 00 to use the PID controller for closed loop control of e g speed or pressure in the co...

Page 29: ...ect Remote 1 By selecting Linked to Hand Auto 0 default the reference site will depend on which mode is active Hand Mode or Auto Mode Hand Off Auto LCP Keys Reference Site Par 3 13 Active Reference Ha...

Page 30: ...ic pressure in the duct and supplies this to the drive as a feedback signal If the feedback signal is greater than the setpoint reference the drive will slow down to reduce the pressure In a similar w...

Page 31: ...hould increase when the feedback is greater than the setpoint reference PID Proportional Gain par 20 93 This parameter adjusts the output of the drive s closed loop controlled based on the error betwe...

Page 32: ...edbacks or setpoints are used this determines how they will be processed by the drive s Closed Loop Controller Setpoint 1 Setpoint 2 Setpoint 3 par 20 21 par 20 22 par 20 23 These setpoints can be use...

Page 33: ...cause a large undesired change in the output of the controller This is used to limit the maximum effect of the differ entiator This is not active when par 20 95 is set to Off Lowpass Filter Time Analo...

Page 34: ...mperature sensor has a range of 10 to 40 C and uses a two wire trans mitter to provide a 4 20 mA signal The output frequency range of the drive is 10 to 50 Hz 1 Start Stop via switch connected between...

Page 35: ...ed loop 1 00 Closed Loop 3 4 Configure the feedback to the PID controller Set up Analog Input 54 as a feedback input 20 00 Analog input 54 2 default Select the appropriate reference feedback unit 20 1...

Page 36: ...time has been fully optimized Make sure that oscillations of the feedback signal are sufficiently damp ened by the lowpass filter for the feedback signal par 6 16 6 26 5 54 or 5 59 as required 2 9 2...

Page 37: ...egulator based on a stability boundary Experience has shown that the control setting according to Ziegler Nichols rule provides a good closed loop response for many systems If necessary the operator c...

Page 38: ...erence Handling A block diagram of how the drive produces the Remote Reference is shown below 2 Introduction to VLT HVAC Drive VLT HVAC Drive Design Guide 38 MG 11 B2 02 VLT is a registered Danfoss tr...

Page 39: ...rd digital input can be used to reset the Digipot reference All reference resources and the bus reference are added to produce the total External Refer ence The External Reference the Preset Ref erenc...

Page 40: ...keep all zones at or above their respective setpoints Example A two zone two setpoints application Zone 1 setpoint is 18 C and the feedback is 19 C Zone 2 setpoint is 22 C and the feedback is 20 C If...

Page 41: ...tor enclosure This is best done by using integrated screen clamps so as to avoid twisted screen ends pigtails These increase the screen impedance at higher frequencies which reduces the screen effect...

Page 42: ...rades and light indus tries Industrial environment Conducted Radiated Conducted Radiated IEC 61000 6 3 generic Class B Class B IEC 61000 6 4 Class A1 Class A1 EN 61800 3 restricted Class A1 Class A1 C...

Page 43: ...andard Burst IEC 61000 4 4 Surge IEC 61000 4 5 ESD IEC 61000 4 2 Radiated electromagnetic field IEC 61000 4 3 RF common mode voltage IEC 61000 4 6 Acceptance criterion B B B A A Line 4 kV CM 2 kV 2 DM...

Page 44: ...scribed below also comply with the requirements for higher isolation and the relevant test as described in EN 61800 5 1 The PELV galvanic isolation can be shown in six locations see illustration In or...

Page 45: ...e frequency converter and the use of RCD s must always follow national and local regulations 2 13 Control with brake function 2 13 1 Selection of Brake Resistor In certain applications for instance in...

Page 46: ...tor can be selected on the basis of the application in question The brake energy can be dissipated outside the control panel i e where the energy can be utilized The electronics of the frequency conve...

Page 47: ...formance a metal screen can be used 2 15 Extreme running conditions Short Circuit Motor Phase Phase The frequency converter is protected against short circuits by means of current measurement in each...

Page 48: ...intermediate circuit voltage level Mains Drop out During a mains drop out the frequency converter keeps running until the intermediate circuit voltage drops below the minimum stop level which is typi...

Page 49: ...Continuous kVA 208 V AC kVA 2 38 2 70 3 82 4 50 6 00 Max cable size mains motor brake mm2 AWG 4 10 Max input current Continuous 3 x 200 240 V A 5 9 6 8 9 5 11 3 15 0 Intermittent 3 x 200 240 V A 6 5 7...

Page 50: ...08 V AC kVA 8 7 11 1 16 6 21 4 Max cable size mains motor brake mm2 AWG 10 7 35 2 Max input current Continuous 3 x 200 240 V A 22 0 28 0 42 0 54 0 Intermittent 3 x 200 240 V A 24 2 30 8 46 2 59 4 Max...

Page 51: ...1 4 51 5 61 2 Max cable size mains motor brake mm2 AWG 50 1 0 95 4 0 120 25 0 MCM Max input current Continuous 3 x 200 240 V A 68 0 80 0 104 0 130 0 154 0 Intermittent 3 x 200 240 V A 74 8 88 0 114 0...

Page 52: ...AC kVA 2 4 2 7 3 8 5 0 6 5 8 8 11 6 Max cable size mains motor brake mm2 AWG 4 10 Max input current Continuous 3 x 380 440 V A 2 7 3 7 5 0 6 5 9 0 11 7 14 4 Intermittent 3 x 380 440 V A 4 3 5 9 8 0 1...

Page 53: ...100 125 160 250 250 Environment Estimated power loss at rated max load W 4 278 392 465 525 739 698 843 1083 1384 1474 Weight enclosure IP20 kg Weight enclosure IP 21 kg 23 23 23 27 27 45 45 45 65 65 W...

Page 54: ...or cos near unity 0 98 Switching on input supply L1 L2 L3 power ups enclosure type A maximum 2 times min Switching on input supply L1 L2 L3 power ups enclosure type B C maximum 1 time min Environment...

Page 55: ...as output Analog inputs Number of analog inputs 2 Terminal number 53 54 Modes Voltage or current Mode select Switch S201 and switch S202 Voltage mode Switch S201 switch S202 OFF U Voltage level 0 to 1...

Page 56: ...RS 485 serial communication circuit is functionally separated from other central circuits and galvanically isolated from the supplier voltage PELV Digital output Programmable digital pulse outputs 2 T...

Page 57: ...1 1 on 4 6 NC Resistive load 50 V DC 2 A Max terminal load DC 13 1 on 4 6 NC Inductive load 24 V DC 0 1 A Min terminal load on 1 3 NC 1 2 NO 4 6 NC 4 5 NO 24 V DC 10 mA 24 V AC 20 mA Environment accor...

Page 58: ...mance Scan interval 5 ms Control card USB serial communication USB standard 1 1 Full speed USB plug USB type B device plug Connection to PC is carried out via a standard host device USB cable The USB...

Page 59: ...is marginal However in motors from 11 kW and up the advantages are significant In general the switching frequency does not affect the efficiency of small motors Motors from 11 kW and up have their eff...

Page 60: ...nce The natural induction causes an overshoot UPEAK in the motor voltage before it stabilises itself at a level depending on the voltage in the intermediate circuit The rise time and the peak voltage...

Page 61: ...ncy is just as good as with mains operation The efficiency of the motor depends on the type of motor In the range of 75 100 of the rated torque the efficiency of the motor is practically constant both...

Page 62: ...or unscreened inductance The natural induction causes an overshoot UPEAK in the motor voltage before it stabilises itself at a level depending on the voltage in the intermediate circuit The rise time...

Page 63: ...ch can be set to 60 PWM or SFAVM in pa rameter 14 00 A enclosures 60 PWM Pulse Width Modulation Illustration 3 1 Derating of Iout for different TAMB MAX for enclosure A using 60 PWM SFAVM Stator Frequ...

Page 64: ...torque SFAVM Stator Frequency Asyncron Vector Modulation Illustration 3 8 Derating of Iout for different TAMB MAX for enclosure C using SFAVM in Normal torque mode 110 over torque 3 6 3 Derating for...

Page 65: ...Motor Cables or Cables with Larger Cross Section The maximum cable length for this frequency converter is 300 m unscreened and 150 m screened cable The frequency converter has been designed to work u...

Page 66: ...3 7 Mechanical Dimension 3 VLT HVAC Selection VLT HVAC Drive Design Guide 66 MG 11 B2 02 VLT is a registered Danfoss trademark 3...

Page 67: ...mm 242 mm 308 mm 370 mm Width of back plate with one C option B 130 mm 130 mm 170 mm 170 mm 242 mm 242 mm 242 mm 308 mm 370 mm Width of back plate with two C options B 150 mm 150 mm 190 mm 190 mm 242...

Page 68: ...the LCP or blind cover in the extended LCP frame Connect power to the frequency converter Set up the input output functions in the corresponding parameters as mentioned in the section General Technica...

Page 69: ...other inputs outputs on the MCB 101 but not from these on the control card of the drive If the digital inputs 7 8 or 9 are to be switched by use of the internal 24 V power supply terminal 9 the connec...

Page 70: ...s for set up 6 3 6 4 and 16 76 Number of analog voltage inputs Standardised in put signal Input impedance Resolu tion Max load 2 0 10 V DC Approx 5 K ohm 10 bits 20 V continu ously 3 8 5 Digital outpu...

Page 71: ...MCB 105 Extended LCP frame and enlarged terminal cover Label for covering access to switches S201 S202 and S801 Cable strips for fastening cables to relay module A2 A3 A5 C2 IMPORTANT 1 The label MUST...

Page 72: ...Do not combine low voltage parts and PELV systems 3 VLT HVAC Selection VLT HVAC Drive Design Guide 72 MG 11 B2 02 VLT is a registered Danfoss trademark 3...

Page 73: ...s are protected Terminal numbers Terminal 35 external 24 V DC supply Terminal 36 external 24 V DC supply Follow these steps 1 Remove the LCP or Blind Cover 2 Remove the Terminal Cover 3 Remove the Cab...

Page 74: ...pers and valve actuators Support Extended PID controllers with I Os for set point inputs transmitter sensor in puts and Illustration 3 13 Principle diagram for Analog I O mounted in frequency converte...

Page 75: ...h output The function assigned is selectable via a pa rameter and have same options as for analog outputs on control card Real time clock RTC with back up Data format of RTC includes year month date h...

Page 76: ...ze A2 A3 If the enclosure kit is used an IP 20 unit is upgraded to comply with enclosure IP 21 4X top TYPE 1 The IP 4X top can be applied to all standard IP 20 VLT HVAC variants 3 8 13 IP 21 Type 1 En...

Page 77: ...du dt ration is reduced in comparison with the installation without filter Sine wave filters Sine wave filters are designed to let only low frequencies pass High frequencies are consequently shunted a...

Page 78: ...4 How to Order VLT HVAC Drive Design Guide 78 MG 11 B2 02 VLT is a registered Danfoss trademark 4...

Page 79: ...xample above a Profibus LON works option and a General purpose I O option is included in the drive Ordering numbers for VLT HVAC Drive standard variants can also be located in the chapter How to Selec...

Page 80: ...No Local Control Panel Coating PCB 20 X No coated PCB C Coated PCB Mains option 21 X No Mains disconnect switch 1 With Mains disconnect switch IP55 only Adaptation 22 Reserved Adaptation 23 Reserved S...

Page 81: ...LON works 130B1106 130B1206 Options for Slot B MCB 101 General purpose Input Output option 130B1125 MCB 105 Relay option 130B1110 MCB 109 Analog I O option 130B1143 130B1243 Option for Slot D MCB 107...

Page 82: ...requency con verter Filter enclosure Rated current at 200 V Max torque at CT VT Max output frequency Ordering no P1K1 P1K5 Bookstyle IP 20 7 8 A 110 120 Hz 175Z0825 P2K2 P3K7 Bookstyle IP 20 15 2 A 11...

Page 83: ...pe 12 Frame sizes C1 and C2 IP55 66 Type 1 Type 12 1 2 only available in units with brake chopper Only one relay connector is included for FC 101 301 units For DC link connection Load sharing the conn...

Page 84: ...s The frequency converter is cooled by means of air circulation To protect the unit from overheating it must be ensured that the ambient temperature does not exceed the maximum temperature stated for...

Page 85: ...B2 15 22 30 2 5 4 5 2 5 4 5 3 7 3 7 3 7 3 7 3 3 0 6 0 6 C1 18 5 30 37 55 10 10 10 10 3 0 6 C2 37 45 75 90 14 24 14 24 14 14 14 14 3 3 0 6 0 6 Table 5 1 Tightening of terminals 5 2 2 Removal of Knockou...

Page 86: ...at least 10 mm2 or 2 rated mains wires terminated separately according to EN 50178 The mains connection is fitted to the main switch if this is included Illustration 5 1 How to connect to mains and e...

Page 87: ...440 V For IT mains and delta earth grounded leg mains voltage may exceed 440 V be tween phase and earth Illustration 5 5 Terminals for mains and earthing Illustration 5 6 How to connect to mains and e...

Page 88: ...coupling plate 2 Attach motor cable to terminals 96 U 97 V 98 W 3 Connect to earth connection termi nal 99 on decoupling plate with screws from the accessory bag 4 Insert terminals 96 U 97 V 98 W and...

Page 89: ...oltage NB In motors without phase insulation paper or other insulation reinforcement suitable for operation with voltage supply such as a frequency converter fit an LC filter on the output of the freq...

Page 90: ...sary to break the screen to install a motor isolator or motor contactor the screen must be continued at the lowest possible HF impedance Cable length and cross section The frequency converter has been...

Page 91: ...apable of supplying a maximum of 100 000 Arms symmetrical 500 V 600 V maximum Non UL compliance If UL cUL is not to be complied with Danfoss recommends using the fuses mentioned in table 4 2 which wil...

Page 92: ...Ferraz Shawmut 380 500 V 525 600 kW Type RK1 Type J Type T Type RK1 Type RK1 Type CC Type RK1 11K KTS R40 JKS 40 JJS 40 5014006 040 KLS R40 A6K 40R 15K KTS R40 JKS 40 JJS 40 5014006 040 KLS R40 A6K 4...

Page 93: ...ver see illustration Illustration 5 12 A1 A2 and A3 enclosures Illustration 5 13 A5 B1 B2 C1 and C2 enclosures 5 2 9 Control Terminals Drawing reference numbers 1 10 pole plug digital I O 2 3 pole plu...

Page 94: ...screw driver1 in the square hole 2 Pull out the cable 1 Max 0 4 x 2 5 mm 1 2 3 Assembling of IP55 NEMA TYPE 12 housing with mains disconnector 5 2 11 Basic Wiring Example 1 Mount terminals from the ac...

Page 95: ...curs you may have to break the screen or insert a 100 nF capacitor between screen and chassis The digital and analog in and outputs must be connected separately to the VLT HVAC Drive common inputs ter...

Page 96: ...re used to select a current 0 20 mA or a voltage 0 to 10 V configuration of the analog input ter minals 53 and 54 respectively Switch S801 BUS TER can be used to enable termination on the RS 485 port...

Page 97: ...tor Current par 1 24 5 Motor Nominal Speed par 1 25 Step 3 Activate the Automatic Motor Adaptation AMA Performing an AMA will ensure optimum performance The AMA measures the values from the motor mode...

Page 98: ...alarm mode This number along with the description of the alarm will assist you in troubleshooting If you contact Danfoss Service make sure to mention number and alarm description NB Unsuccessful AMA i...

Page 99: ...l cabinet of the frequency converter and to the decoupling plate of the brake resistor 2 Dimension the cross section of the brake cable to match the brake current NB Voltages up to 975 V DC 600 V AC m...

Page 100: ...3 enclosures Terminals for relay connection A5 B1 and B2 enclosures Illustration 5 17 Terminals for relay connection C1 and C2 enclosures 5 How to Install VLT HVAC Drive Design Guide 100 MG 11 B2 02 V...

Page 101: ...uency converter NB When motors are connected in parallel par 1 02 Automatic Motor Adaptation AMA cannot be used Problems may arise at start and at low RPM values if motor sizes are widely different be...

Page 102: ...motor rotation is changed by switching two motor phases 5 4 7 Motor Thermal Protection The electronic thermal relay in the frequency converter has received the UL approval for single motor protection...

Page 103: ...on the control card for ON For more information see the paragraph Switches S201 S202 and S801 NB Communication protocol must be set to FC MC par 8 30 5 5 2 How to Connect a PC to the FC 100 To control...

Page 104: ...mmunication network off line MCT 10 contains a complete frequency con verter database Commissioning frequency converters on line Saving settings for all frequency converters Replacing a drive in a net...

Page 105: ...Maintenance Sched ule Clock settings Timed Action Programming Smart Logic Controller Set up Ordering number Please order your CD containing MCT 10 Set up Software using code number 130B1000 MCT 10 can...

Page 106: ...ood engineering practice to ensure EMC correct electrical installation Use only braided screened armoured motor cables and braided screened armoured con trol cables The screen should provide a minimum...

Page 107: ...n may have just as good an EMC performance provided the above guide lines to engineering prac tice are followed If the installation is not carried out according to the guideline and if unscreened cabl...

Page 108: ...cable Transfer impedance ZT can be assessed on the basis of the following factors The conductibility of the screen material The contact resistance between the individual screen conductors The screen...

Page 109: ...arth potential between the frequency converter and the PLC etc is different electric noise may occur that will disturb the entire sys tem Solve this problem by fitting an equalising cable next to the...

Page 110: ...rrents compared to the RMS input current Input current IRMS 1 0 I1 0 9 I5 0 4 I7 0 2 I11 49 0 1 To ensure low harmonic currents the frequency converter is equipped with intermediate circuit coils as s...

Page 111: ...lt Illustration 6 1 Terminal 37 Available only with Safe Stop Function 6 1 2 Pulse Start Stop Terminal 18 start stop par 5 10 9 Latched start Terminal 27 Stop par 5 12 6 Stop inverse Par 5 10 Digital...

Page 112: ...par 1 20 to 1 26 For the best adjustment of the frequency converter carry out AMA on a cold motor Repeated AMA runs may lead to a heating of the motor which results in an increase of the stator resist...

Page 113: ...ts will be evaluated This means that when the SLC starts it evaluates event 1 and only event 1 each scan interval Only when event 1 is evaluated TRUE the SLC executes action 1 and starts evaluating ev...

Page 114: ...rence 1 to second preset speed par 3 10 1 Ex 0 zero Set the timer 0 for constant running speed in par 13 20 0 Ex 2 sec Set Event 1 in par 13 51 1 to True 1 Set Event 2 in par 13 51 2 to On Reference 4...

Page 115: ...ON Start stop command is applied on terminal 18 If stop signal is applied the frequency converter will ramp down and go into free mode VLT HVAC Drive Design Guide 6 Application Examples MG 11 B2 02 V...

Page 116: ...pump maintenance and increasing reliability and lifetime of the system The al ternation of the lead pump can take place at a command signal or at staging adding an other pump The command can be a man...

Page 117: ...value of the timer expires the lead pump is removed avoiding a deal heat water circulation prob lem 6 1 10 System Status and Operation If the lead pump goes into Sleep Mode the function is displayed o...

Page 118: ...1 cuts in contactor K1 which becomes the lead pump K1 blocks for K2 via the mechanical interlock preventing mains to be con nected to the output of the frequen cy converter via K1 Auxiliary break cont...

Page 119: ...Cut out built in relays are de energized Safety Interlock Coast to stop Cut out built in relays are de energized Function of buttons on Local Control Panel Variable speed pump lead Fixed speed pumps H...

Page 120: ...7 RS 485 Installation and Set up VLT HVAC Drive Design Guide 120 MG 11 B2 02 VLT is a registered Danfoss trademark 7...

Page 121: ...e for bus cabling and always follow good common installation practice Low impedance ground connection of the screen at every node is very important including at high frequencies This can be achieved b...

Page 122: ...eened twisted pair cables are recommended in order to reduce noise between conductors Illustration 7 1 Network Terminal Connection 7 1 3 VLT HVAC Hardware Setup Use the terminator dip switch on the ma...

Page 123: ...rans mitting a request and receiving a response 8 37 Max inter char delay Specify a maximum delay time between two re ceived bytes to ensure timeout if transmission is interrupted 7 1 5 EMC Precaution...

Page 124: ...annel A third telegram format is used for texts 7 2 1 VLT HVAC with Modbus RTU The FC protocol provides access to the Control Word and Bus Reference of the frequency con verter The Control Word allows...

Page 125: ...ing 8 30 Protocol FC 8 31 Address 1 126 8 32 Baud Rate 2400 115200 8 33 Parity Stop bits Even parity 1 stop bit default VLT HVAC Drive Design Guide 7 RS 485 Installation and Set up MG 11 B2 02 VLT is...

Page 126: ...is completed by a data control byte BCC 7 4 3 Telegram Length LGE The telegram length is the number of data bytes plus the address byte ADR and the data control byte BCC The length of telegrams with...

Page 127: ...s the address byte unchanged to the master in the response telegram 7 4 5 Data Control Byte BCC The checksum is calculated as an XOR function Before the first byte in the telegram is received the Calc...

Page 128: ...om master to slave Status word and present output frequency from slave to master Parameter block The parameter block is used to transfer parameters between master and slave The data block is made up o...

Page 129: ...rd 1 1 1 0 Write parameter value in RAM and EEprom word 1 1 1 1 Read write text Response slave master Bit no Response 15 14 13 12 0 0 0 0 No response 0 0 0 1 Parameter value transferred word 0 0 1 0 P...

Page 130: ...ff 82 There is no bus access to the defined parameter 83 Data change is not possible because factory setup is selected 7 4 8 Parameter Number PNU Bits no 0 10 transfer parameter numbers The function o...

Page 131: ...e 9 For example read the unit size and mains voltage range in par 15 40 FC Type When a text string is transferred read the length of the telegram is variable and the texts are of different lengths The...

Page 132: ...the value transferred is multi plied by 0 1 The value 100 is thus perceived as 10 0 Conversion table Conversion index Conversion factor 74 0 1 2 100 1 10 0 1 1 0 1 2 0 01 3 0 001 4 0 0001 5 0 00001 7...

Page 133: ...he value in par 3 41 Ramp 1 Up Time PKE 1155 Hex Read parameter value in par 3 41 Ramp 1 Up Time IND 0000 Hex PWEHIGH 0000 Hex PWELOW 0000 Hex If the value in par 3 41 Ramp 1 Up Time is 10 s the respo...

Page 134: ...are returned to broadcast queries from the master The Modbus RTU protocol establishes the format for the master s query by placing into it the device or broadcast address a function code defining the...

Page 135: ...heck CRC 7 8 2 Modbus RTU Message Structure The transmitting device places a Modbus RTU message into a frame with a known beginning and ending point This allows receiving devices to begin at the start...

Page 136: ...er it uses the function code field to indicate either a normal error free response or that some kind of error occurred called an exception response For a normal response the slave simply echoes the or...

Page 137: ...cy converter feedback signal Slave to master 65 Parameter write control master to slave Master to slave 0 Parameter changes are written to the RAM of the frequency converter 1 Parameter changes are wr...

Page 138: ...8 9 How to Control VLT HVAC This section describes codes which can be used in the function and data fields of a Mod bus RTU message For a complete description of all the message fields please refer t...

Page 139: ...to the parameter called 131 Data change is not possible because factory set up is selected 7 9 How to Access Parameters 7 9 1 Parameter Handling The PNU Parameter Number is translated from the registe...

Page 140: ...tion This function reads the ON OFF status of dis crete outputs coils in the frequency convert er Broadcast is never supported for reads Query The query message specifies the starting coil and quantit...

Page 141: ...Field Name Example HEX Slave Address 01 frequency con verter address Function 05 write single coil Coil Address HI 00 Coil Address LO 40 coil no 65 Force Data HI FF Force Data LO 00 FF 00 ON Error Ch...

Page 142: ...0 Coil Address LO 10 coil address 17 Quantity of Coils HI 00 Quantity of Coils LO 10 16 coils Byte Count 02 Force Data HI Coils 8 1 20 Force Data LO Coils 10 9 00 ref 2000hex Error Check CRC Response...

Page 143: ...of Points LO 03 Error Check CRC Response The register data in the response message are packed as two bytes per register with the binary contents right justified within each byte For each register the...

Page 144: ...ction 06 Register Address HI 00 Register Address LO 01 Preset Data HI 00 Preset Data LO 03 Error Check CRC Response Response The normal response is an echo of the query returned after the register con...

Page 145: ...Address LO 19 No of Registers HI 00 No of registers LO 02 Byte Count 04 Write Data HI Register 4 1049 00 Write Data LO Register 4 1049 00 Write Data HI Register 4 1050 02 Write Data LO Register 4 1050...

Page 146: ...5 No function Reverse Explanation of the Control Bits Bits 00 01 Bits 00 and 01 are used to choose between the four reference values which are pre programmed in par 3 10 Preset reference according to...

Page 147: ...akes the motor speed ramp down to stop via the selected ramp down par Bit 06 1 Permits the frequency converter to start the motor if the other starting conditions are met NB Make a selection in par 8...

Page 148: ...able Set up Bit 14 Bit 13 1 0 0 2 0 1 3 1 0 4 1 1 The function is only possible when Multi Set Ups is selected in par 0 10 Active Set Up NB Make a selection in par 8 55 Set up select to define how Bit...

Page 149: ...ase of external 24 V supply to controls Bit 01 Drive ready Bit 01 1 The frequency converter is ready for operation but the coasting command is active via the digital inputs or via serial communication...

Page 150: ...it 11 1 The frequency converter has a start signal or the output frequency is greater than 0 Hz Bit 12 Drive OK stopped autostart Bit 12 0 There is no temporary over temperature on the inverter Bit 12...

Page 151: ...word in integers 0 32767 the value 16384 4000 Hex corresponds to 100 Neg ative figures are formatted by means of 2 s complement The Actual Output frequency MAV is scaled in the same way as the bus re...

Page 152: ...8 Troubleshooting VLT HVAC Drive Design Guide 152 MG 11 B2 02 VLT is a registered Danfoss trademark 8...

Page 153: ...an alarm cannot be reset the reason may be that its cause has not been rectified or the alarm is trip locked see also table on following page Alarms that are trip locked offer additional protection me...

Page 154: ...se V missing X X X 4 58 32 Motor phase W missing X X X 4 58 33 Inrush fault X X 34 Fieldbus communication fault X X 38 Internal fault X X 47 24 V supply low X X X 48 1 8 V supply low X X 50 AMA calibr...

Page 155: ...3554432 1 8V Supply Low Current Limit 26 04000000 67108864 Brake Resistor Low Temp 27 08000000 134217728 Brake IGBT Voltage Limit 28 10000000 268435456 Option Change Unused 29 20000000 536870912 Drive...

Page 156: ...ore than nominal current for too long WARNING ALARM 10 Motor ETR over temperature According to the electronic thermal protection ETR the motor is too hot You can choose if you want the frequency conve...

Page 157: ...n the dis sipated braking power is higher than 100 WARNING ALARM 27 Brake chopper fault The brake transistor is monitored during op eration and if it short circuits the brake func tion disconnects and...

Page 158: ...too small for the AMA to be car ried out ALARM 55 AMA par out of range The par values found from the motor are out side acceptable range ALARM 56 AMA interrupted by user The AMA has been interrupted...

Page 159: ...Configuration has Changed One or more options has either been added or removed since the last power down ALARM 70 Illegal Frequency Configuration Actual combination of control board and pow er board i...

Page 160: ...aptation 112 Automatic Motor Adaptation AMA 97 B Basic Wiring Example 94 Battery back up of clock function 74 Brake Connection Option 99 Brake Function 46 Brake power 9 46 Brake Resistor 45 Brake resi...

Page 161: ...itions 1 Derating for Ambient Temperature 63 Derating for Installing Long Motor Cables or Cables with Larger Cross Section 65 Derating for Low Air Pressure 64 Derating for Running at Low Speed 65 Devi...

Page 162: ...ltage Test 106 Hold output frequency 147 How to Connect a PC to the FC 100 103 I I Os for set point inputs 74 Intermediate circuit 46 48 60 62 155 J Jog 7 Jog 147 K KTY sensor 156 L LC filter 89 LCP 7...

Page 163: ...otation 102 Motor thermal protection 150 Motor Thermal Protection 48 102 Motor voltage 60 62 Mounting of decoupling plate 88 N Name plate data 97 Non UL compliance 91 O Ordering numbers 79 Ordering Nu...

Page 164: ...on 103 RS 485 121 S Safety Earth Connection 106 Save Drive Settings 105 screened armoured 95 Serial communication 58 109 Serial communication port 8 Set speed limit and ramp time 98 Side by side insta...

Page 165: ...Type Code String 1 U Unsuccessful AMA 98 USB Connection 93 Use of EMC Correct Cables 108 V Vibration and Shock 16 Voltage level 55 VVCplus 11 VLT HVAC Drive Design Guide Index MG 11 B2 02 VLT is a reg...

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