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UD78 User Guide

Issue code:  78nu2

Appendix

A Serial Comms. ANSI Message Formats A-1

A.1  Fundamentals of data transmission A-1
A.2  Reading a parameter value A-4
A.3  Re-reading a parameter value A-5
A.4  Writing a parameter value A-5
A.5  Re-writing a parameter value A-6
A.6  Calculating the block checksum (BCC) A-6

B Setting up the Drive using UniSoft B-1

Summary of Contents for UD78

Page 1: ...User Guide UD78 UD78 Servo large option module for Unidrive Part Number 0460 0086 Issue Number 2...

Page 2: ...anical including photocopying recording or by any information storage or retrieval system without permission in writing from the publisher Use within the European Union etc The following information a...

Page 3: ...0 4 3 SK2 Back up DC supply input connector 11 Functions of the terminals 11 Specification 11 Operation 12 4 4 PL1 Serial communications connector 13 Functions of the terminals 13 Specification 13 Ser...

Page 4: ...ts A 1 A 1 Fundamentals of data transmission A 1 A 2 Reading a parameter value A 4 A 3 Re reading a parameter value A 5 A 4 Writing a parameter value A 5 A 5 Re writing a parameter value A 6 A 6 Calcu...

Page 5: ...module is an interface module for installation in a Unidrive and has the following functions Precision analog input EIA RS485 4 wire or 2 wire serial communications interface fully opto isolated Back...

Page 6: ...Serial comms interface The serial communications interface allows the following The Drive to be controlled and monitored remotely by a system controller The Drive to control or monitor another Drive...

Page 7: ...rive has been energized the AC supply must be isolated at least ten minutes before work may continue 2 3 System design The Drive is intended as a component for professional incorporation into complete...

Page 8: ...output of the Drive or from any external option unit The Stop and Start controls or electrical inputs of the Drive should not be relied upon to ensure safety of personnel If a safety hazard could exis...

Page 9: ...y as specified in IEC664 1 The installer must ensure that the external control circuits are insulated from human contact by at least one layer of insulation rated for use at the AC supply voltage If t...

Page 10: ...erminal cover from the Drive for removal instructions see Installing the Drive and RFI filter in Chapter 2 of the Unidrive Installation Guide 4 Push the UD78 into the cavity immediately behind the key...

Page 11: ...er the AC supply or a DC back up supply is applied to the Drive If the UD78 is removed when the Drive is powered up the Drive will trip the display will indicate ANI diS If the UD78 is deliberately re...

Page 12: ...ontrol circuits are insulated from human contact by at least one layer of insulation rated for use at the AC supply voltage If the control circuits are to be connected to other circuits classified as...

Page 13: ...VD 0VD SK1 UD78 System controller 0VD NC 0VD Vout Vout Figure 4 Connections to the precision analog input Functions of the terminals Terminal Name Function 1 0VD 0V 2 Vin Reference input 3 Vin Referen...

Page 14: ...put 150 V Zero crossing error 150 V Linearity error 0 1 of full scale Input filter time constant 10 s Resolution Open loop 12 bit plus sign Closed loop pulses are accumulated Sample period See below O...

Page 15: ...upply voltage including ripple 22 8V 26 4V Maximum ripple at 100Hz 1V RMS Absolute maximum voltage 50V Absolute maximum reverse voltage 30V Continuous current when the AC supply is disconnected from t...

Page 16: ...communications but parameter values cannot be saved Model sizes 1 and 2 Heatsink fan operates Model sizes 3 and 4 Heatsink fans do not operate Power up delays The following delays occur AC supply dis...

Page 17: ...ads EIA RS485 2 wire Transceiver mode 4 unit loads EIA RS485 Termination resistance 120 5 no series capacitor In accordance with the EIA RS485 specification the total load on a line must not exceed 32...

Page 18: ...r operation in the following modes 2 wire ANSI Half duplex communications transceiver mode 4 wire ANSI Half duplex communications independent RX and TX channels Output The Drive is to control another...

Page 19: ...ire serial communications connections Ensure parameter 11 24 Serial comms mode selector is set at ANSI 4 1 default setting Two wire ANSI 0VSC PL1 UD78 TX RX TX RX System controller 0VSC RXTERM TXTERM...

Page 20: ...arameter 11 24 Serial comms mode selector as follows Output mode OutPUt 2 Input mode InPUt 3 Output mode The value of a variable parameter selected by parameter 11 27 Serial comms source selector is s...

Page 21: ...d of the link If this unit is a UD78 the RX line can be terminated by linking terminals 5 and 9 the TX line by linking terminals 4 and 8 Note When 2 wire mode transceiver is used link terminals 5 and...

Page 22: ...ve User Guide Key Type of parameter RO Read only RW Read write selector Select from a number of settings enable Make or allow a function to operate indicator The value can only be read Limitations of...

Page 23: ...scaling Any unprotected variable parameter 7 10 Function 1 destination selector V f x 1 2 3 Precision analog input 7 09 Analog input 1 invert 7 01 Analog input 1 The parameters are shown at their def...

Page 24: ...1 Analog input 1 indicator to indicate zero 7 08 Analog input 1 scaling 0 4 000 1 RW Uni Set 7 08 at the required value to alter the scaling of the analog reference The scaling takes place after full...

Page 25: ...value is less than 1 5V the new full scale value will be the default value 9 8V 2 Set 7 25 at 1 The input scaling automatically changes according to the applied value see step 1 This new value will se...

Page 26: ...or via serial communications but parameter values cannot be saved Model sizes 1 and 2 Heatsink fan operates Model sizes 3 and 4 Heatsink fans do not operate 5 4 Serial communications parameters 11 23...

Page 27: ...her Drive 11 27 Serial comms destination selector See PL1 Serial communications connector in Chapter 4 Making Connections 11 25 Serial comms baud rate 4800 0 9600 1 19200 2 4800 baud RW Txt P Applicab...

Page 28: ...le parameter can be specified If any other type of parameter is specified no value is transmitted Input mode Only a variable parameter that is not protected can be specified If any other type of param...

Page 29: ...aracter 2nd hex character Start bit 7 data bits Parity bit Stop bit 0 LSB MSB 1 This is known as a 10 bit frame since there are 10 bits transmitted in total The format is described as follows 1 start...

Page 30: ...e on an ANSI communications bus must be given a unique identity or address so that only the target Drive will respond to a command transmitted by the system controller The address comprises the follow...

Page 31: ...d by four digits representing the menu and the parameter number but without the decimal point Example To send a message to menu 4 parameter 26 write 0426 the leading zero must be included To send a me...

Page 32: ...ure if the message is understood Control Parameter Data Control BCC STX M1 M2 P1 P2 D1 Dn ETX BCC Where M1 M2 Menu number P1 P2 Parameter number D1 Dn Data First character or Space for positive values...

Page 33: ...riod of time A 4 Writing a parameter value To write a value to a parameter the message structure is comprised as follows Control Address Control Parameter Data Control BCC EOT GA GA UA UA STX M1 M2 P1...

Page 34: ...When a different Drive is addressed or an invalid character is received the re write facility no longer functions The first Drive can be addressed again only by using the full write message with the a...

Page 35: ...e used as control codes When the final XOR result produces a decimal value less than 32 32 is added In this example 0011 0100 is 52 decimal which is above 31 so this is the final BCC value 52 decimal...

Page 36: ...UD78 User Guide Issue code 78nu2 A 8...

Page 37: ...yed defining the parameters function type and min max permitted value Unisoft is available from your local Drive Centre PCs have an RS232 serial communications interface To enable the PC to communicat...

Page 38: ...UD78 User Guide Issue code 78nu2 B 2...

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