SIMOREG DC Master. Application SIMOREG 1Q-device, braking to defined speed using reversing. 6RA70 Series
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1 SIMOREG DC Master 6RA7 Series Application SIMOREG Q-device, braking to defined speed using reversing Microprocessor-ased Converters from 6kW to 9kW for Variable-Speed DC Drives Edition
2 Edition 2 NOTE This application documentation does not purport to handle or take into account all of the equipment details or versions or to cover every conceivable operating situation or application. If you require more detailed information, or if special problems occur, which are not handled in enough detail in this document, please contact your local Siemens office. The contents of this application documentation are not part of an earlier or existing agreement or legal contract and neither do they change it. The actual purchase contract represents the complete liability of the A&D Variable-Speed Drives Group of Siemens AG. The warrant conditions, specified in the contract between the two parties, is the only warranty which will be accepted by the A&D Variable-Speed Drives Group. The warranty conditions specified in the contract are neither expanded nor changed by the information provided in this application documentation. WARNING These converters contain hazardous electrical voltages, hazardous rotating machinery (fans) and control rotating mechanical components (drives). Death, serious bodily injury or substantial damage to property will occur if the instructions in the relevant operating manuals are not observed. Only qualified personnel who are thoroughly familiar with all safety notices contained in the operating instructions as well as erection, operating and maintenance instructions must be allowed to work on these devices. Successful and safe operation of this equipment is dependent on careful transportation, proper storage and installation as well as correct operation and maintenance. The reproduction, transmission or use of this document or contents is not permitted without express written authority. Offenders will be liable for damages. All rights, including rights created by patent grant or registration of a utility model or design, are reserved. We have checked that the contents of this publication agree with the hardware and software described herein. Nonetheless, differences might exist and therefore we cannot guarantee that they are completely identical. The information given in this publication is reviewed at regular intervals and any corrections that might be necessary are made in the subsequent printings. Suggestions for improvement are welcome at all times. SIMOREG is a registered trademark of Siemens Siemens AG 2 All rights reserved
3 2 Edition Contents Applications...4. Function description Parameter list Function diagrams...8 Page Siemens AG 3- SIMOREG DC Master Applikation SIMOREG Q-device, braking to defined speed using reversing
4 Edition 2 Applications Using this application note, it is possible to implement a braking function in a -Q SIMOREG. In comparison to the 4-Q Simoreg, where braking is performed automatically depending on the applied setpoint, the braking process is started using a binary signal and a reduced setpoint value. NOTICE The setpoint has to be positive. Negative values can not be used, because during the internal field reversing sequence, the actual speed value is inverted, and closed loop control would not be functional. This Application Note is especially useful for drives, that do not need 4-Q functionality, but require braking to a defined speed >. (for example paper mills, operating mode change from operation to crawl ). ACTIVATION of Option S is required for this application. The application is based on direction of rotation reversal using field reversal described in operating manual section WARNING Also make sure, the appropriate overvoltage protection is present. (See Application Note Simoreg as a field supply unit, Section 5). Function description Using a binary signal, braking is initialized, requesting field reversal, and setting the main setpoint to the braking setpoint. According to section 9.8. the internal sequence for field reversal is initialized. The field is reversed, reducing the speed of the motor. Once the setpoint has been reached, a limit-value monitor resets the RS-flip flop initializing the sequence to establish the previous field state. The braking setpoint stays active, until a reset signal is applied to the brake to defined speed storing RS-flip flop. For example Should the signal braking to defined speed be used to reset the RS-flip flop, an inverter has to be inserted and connected to U46.2 (RS-flip flop Reset). This example is shown in the function diagram and highlighted in gray. If one of SIMOREG s digital input s is used, the inverted signal is provided by default, eliminating the need for an inverter. The braking operation can be canceled any time (even when field reversal is active), by resetting this RS-flip flop. 4- Siemens AG SIMOREG DC Master Applikation SIMOREG Q-device, braking to defined speed using reversing
5 2 Edition To prevent the brake setpoint from exceeding the main setpoint, a limitter is used. The adjoining multiplexer is used to disable altering of the brake setpoint while braking is active. (Contact function diagrams at the end of the document for details) Please note that at the moment of field reversal, the armature current and field current are. The hysteresis ( U 88 ) has to be set according to system specification. The hysteresis value depends on inertia, drive friction, etc..if this is not taken into account, the drives speed is reduced below the setpoint, therefore accelerating again to reach the appropriate speed once the original field direction is present. The hysteresis ( U 88 ) should be set to a value for the limiter to react in advance. If the brake setpoint reaches the hysteresis of the actual value prior to braking, the signal brake to defined speed is blocked, and field reversal is not performed. Also make sure, that the function blocks of option S are enabled and processed in correct order. Contact SIMOREG DC MASTER operating instructions Section.79,.8 and.82 for details. The processing sequence has to be maintained according to the following list: Limit-value monitor block 7 Inverter block 8 (Inverter block 8 OPTIONAL) AND block 2 RS-flip-flop block 26 Limiter block 65 Multiplexer block 86 OR block 5 Timer(pulse generator) block 24 RS-flip-flop block 25 Connector changeover switch block 9 Sampling times have to be set using parameters U95,U95 and U952 according to SIMOREG Operating Manual. y default, sampling time for all of the freely assignable function blocks used in this application note is set to. Siemens AG 5- SIMOREG DC Master Applikation SIMOREG Q-device, braking to defined speed using reversing
6 Edition 2 2 Parameter list Parameter Description Value U75. Source for input signal limiter raking setpoint source U75.2 Positive limit limiter Main setpoint U75.3 Negative limit limiter U3. Source for control bits for the multiplexer; is used for freezing the braking setpoint during braking operation. Source of rake signal U3. Multiplexer input 967 value of limited brake setpoint U3.2 Multiplexer input value of Multiplexer output for setpoint freezing U38 Inverter for signal from limit-value monitor 962 limit-value monitor output (A=) U32. And input Signal brake to defined speed. Source according to system specification (for example Digitalinput, or Profibus,...) U32.2 And input inverter output U46. RS-flip-flop set 935 And output U46.2 RS-flip-flop reset System specific; see description for details. U24 Connector changeover switch; source for control signal U24. Connector changeover switch; Source U24.2 Connector changeover switch; Source 2 Source of rake signal Source of main setpoint (for example 27) 945 braking setpoint P443 Source of main setpoint 92 output of connector changeover switch U85. Limit-value monitors with filtering, Source signal A U85.2 Limit-value monitors with filtering, Source signal 66 actual speed value (absolute value) 945 multiplexer output U88 Hysteresis setting Setting according to system specifications U44. Timer source; set pulse generation for RS-flip-flop (block 25) field reversal U44 Time for timer (length of pulse),->ms 9552 RS-flip-flop output (block 26) U442 Mode of timer 3 = pulse generation U45. Source of RS-flip flop Set signal 958 TIMER output U45.2 Source of RS-flip flop Reset signal 938 OR output U35. OR Source 962 limit-value monitor output U35.2 OR Source RS-flip-flop (block 26) inverted output 6- Siemens AG SIMOREG DC Master Applikation SIMOREG Q-device, braking to defined speed using reversing
7 2 Edition Parameter Description Value U977 Enable option S PIN-Number (Contact Operating Manual section.82) n978 S enabled display U96 S execution sequence Index = 7 (Limit-value monitor) Index 2 = 8 (Inverter) Index 3 = 2 (And) Index 4 = 26 (RS-flip flop) Index 5 = 65 (limiter) Index 6 = 86 (Multiplexer) Index 7 = 5 (Or) Index 8 = 24 (Timer) Index 9 = 25 (RS-flip flop) Index =9 (Connector changeovr. sw.) U95-U952 Sampling time settings for the freely assignable function blocks. (Contact Simoreg operating manual section.79 for details) All function bolocks used in this Application Note, have to be processed in time slice No.. Siemens AG 7- SIMOREG DC Master Applikation SIMOREG Q-device, braking to defined speed using reversing
8 Edition 2 3 Function diagrams Field reversal with SIMOREG single-quadrant converter Direction of rotation reversal using field reversal = Switch on field contactor (positive field direction) P58. () P77 () 26 (no delay) (not inverted) P775= P77= inary output Terminal 46 / 47 (see Sheet "inary outputs") X7 (CUD) Forward direction 46 k2 2 raking with field reversal P58. () Control logic for field reversal = Switch on field contactor 2 (negative field direction) 26 P772 () 26 (no delay) P776= (not inverted) P77= inary output Terminal 48 / 54 (see Sheet "inary outputs") M 47 Reverse direction 48 k I f < I fmin (from Sheet Messages 2) 26 I f < I fx (from Sheet Messages 2) 67 Actual speed value (signed) P92 (,...,s) (3,s): Delay time for field reduction before opening of the current field contactor (,2s): Delay time before actuation of the new field contactor.3 (,s): Delay time before enable of the field firing pulses.4 (3,s): Delay time after field build-up before armature enable Reverse polarity actual speed value 67 to Sheet "Speed controller (2)" *) Protective circuit M 54 a) with protective resistor b) with varistor V R S R S = R S V I field rated 7 8 C D 3C 3D M k2 k2 R S V *) A protective circuit with varistor can be used if the following applies: I field rated 2 * L < 4 Ws 2 R S.5 kω V = 32k42 (SIOV, block varistor) Sheet 8- Siemens AG SIMOREG DC Master Applikation SIMOREG Q-device, braking to defined speed using reversing
9 2 Edition 2 3 SP...rake setpoint AFR...Abort Field Reversal ) rake setpoint ) Main setpoint 966 U75 FS x + y X>+ X< x y - 65 rake to defined speed ) U38 () U32 () & ) U38 () ) rake to defined speed/ return to previous speed U46 () 935 ) POWER ON <> (Q=) (Q=) Q Q Actual value SP U FS 98 Filter time...ms U87 () A 98 U88 Hysteresis,...99,99 U88 (,) U88 U88 U88/2 A A A < A< <> A= U88 A AFR 967 U44 () U3 () U3 () Setpoint changeover U24 () 9552 SP U24 () U44 (,) =, (,...6,s) U442 () = 3 Pulse generator T ON delay Mode T O 24 OFF delay O T ON/OFF delay 958 T T Pulse generator T 3 = Reset AFR U35 () ³ Y 945 SP 9 92 P443 FS 92 to main setpoint P443 SIMOREG DC Master, Operating Instructions Section 8, Sheet G3 ) Connector/innector assignments are system/application specific 2) This function block is optional. It is only used to invert the Signal "brake to defined speed", to reset the RS-flipflop and change back to the original speed. The block is not needed, if seperate signal or inverted "brake to defined speed" signal (Simoreg digital input) is available. U46.2 (RS-flipflop 26, reset) has to be set to the apropriate source. to Sheet, P58 U45 () (Q=) Q POWER ON <> Q 955 (Q=) Sheet 2 Siemens AG 9- SIMOREG DC Master Applikation SIMOREG Q-device, braking to defined speed using reversing
10 Edition 2 Siemens AG Elektronikwerk Wien PO ox 83, A-2 Vienna Siemens AG, 2 Subject to change without prior notice Siemens Aktiengesellschaft SIMOREG DC Master Application SIMOREG Q-device, braking to defined speed using reversing Printed in Austria
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