GB BU 0050 USS Bus modules and MODBUS RTU Supplementary manual for NORD frequency inverters
NORD USS and Modbus RTU Manual Safety information N O R D Frequency inverters Safety and operating instructions for drive power converters (as per: Low Voltage Directive 2006/95/EEC ) 1. General During operation, drive power converters may, depending on their protection class, have live, bare, moving or rotating parts or hot surfaces. Unauthorised removal of covers, improper use, incorrect installation or operation causes a risk of serious personal injury or material damage.
NORD USS and Modbus RTU Manual Concerning this document Documentation Designation: BU 0050 GB Part No.: 607 05 01 Device series: USS for SK 300E, SK 500E (entire series), SK 700E, SK 750E Modbus RTU for SK 540E and SK 545E Version list Designation of previous issues Software Version BU 0500 GB, December 2004 Comments Latest version Part No.
NORD DeviceNet Manual Concerning this document Intended use of the frequency inverter Compliance with the operating instructions is necessary for fault-free operation and the acceptance of any warranty claims. These operating instructions must be read before working with the device! These operating instructions contain important information about servicing. They must therefore be kept close to the device.
Contents FOREWORD ................................................................................................................................7 1 USS ...........................................................................................................................................7 1.1 General information ..............................................................................................7 1.1.1 The USS Protocol .........................................................................
NORD USS and Modbus RTU Manual 3 FAULTS.................................................................................................................................. 71 3.1 Troubleshooting ................................................................................................. 71 3.1.1 Error display............................................................................................................ 71 3.1.2 Error memory ....................................................................
1.1 USS - General information Foreword This supplementary documentation is valid for the SK 300E, SK 500E, SK 700E series and for the SK 750E. It describes the setup of communication via RS485. For this, the main emphasis is on communication according to the USS protocol. Corresponding optional modules are available for the SK 700E and SK 750E series. The SK 300E and SK 500E series have an appropriate interface integrated as standard.
NORD USS and Modbus RTU Manual 1.1.4 Scope of supply SK TU1-RS232* for frequency inverter SK 700E IP20 or SK CU1-STD for frequency inverter SK 700E, SK 750E IP20 or SK CU1-USS for frequency inverter SK 700E, SK 750E *incl. screw for optional fixing to the FI IP20 or 1.1.5 Certifications 1.1.5.
1.2 USS - Modules 1.2 Modules 1.2.1 SK 500E 1.2.1.1 General By the use of various modules for display, control and parameterisation, the SK 5xxE can be easily adapted to various requirements. Alphanumerical display and operating modules can be used for simple commissioning. For more complex tasks, various connections to a PC or an automation system can be selected.
NORD USS and Modbus RTU Manual 1.2.1.2 RS 485 interface As standard, all devices in the SK 500E series have an integrated interface for USS bus communication.
1.2 USS - Modules RJ 12 socket (X11) In addition to the RS485 interface, the RJ12 socket also provides an interface for communication via RS 232. However, the RS232 interface is only intended for connecting a PC. If a network is to be set up with several participants which communicate via USS (frequency inverters), it must be noted that communication must be via RS 485. The RS232 interface (contacts X11:TXD and X11:RXD) cannot be deactivated on the frequency inverter.
NORD USS and Modbus RTU Manual 1.2.2 SK 700E 1.2.2.1 General With the combination of modules for display, technology units and modules with digital and analog inputs and interfaces, customer interfaces or special extensions, the SK 700E can be easily extended to cater for the requirements of a wide range of applications. Technology units (Technology Units) are modules which can be inserted from above for display, parameterisation and control of the inverter.
1.2 USS - Modules 1.2.2.2 Technology Box RS232 (SK TU1-RS2, Option) The Technology Box (Technology Unit) is clipped to the outside of the inverter. The RS232 interface enables simple connection of an SK 700E to a PC with a serial interface. Communication between PC and frequency inverter can be set up using the NORD CON Software (Windows). This is used for the control, parameterisation and display of operating values of the frequency inverter.
NORD USS and Modbus RTU Manual 1.2.2.4 Customer unit Standard I/O (SK CU1-STD, Option) The standard I/O of the customer interface(Customer Unit) provides sufficient control terminals for most applications and it is fully terminal-compatible with NORDAC vector mc.. 1 analog differential input, 4 digital inputs and 1 analog output are available for control of the frequency inverter. Readiness for operation is shown via the 2 relay contacts and a mechanical motor brake is activated at the correct time.
1.2 USS - Modules 1.2.2.5 USS Customer Interface (SK CU1-USS, Option) In addition to data connections, the USS customer units are also equipped with conventional digital inputs and outputs. Via the existing relay contacts, a mechanical motor brake can be controlled or readiness for operation can be communicated to a higher level system. USS The digital input has a 2.5V switching threshold for the evaluation of the temperature sensor. The input can, however, also be used for an emergency stop function.
NORD USS and Modbus RTU Manual 1.2.2.6 Installation of customer units WARNING Installation must be carried out by qualified personnel only, paying particular attention to safety and warning instructions. A customer interface must not be replaced while it is carrying voltage. NOTE Locking pin Verrieglungsstift Technologiebox Technology unit 1. Switch off the mains voltage, observe the waiting period. 2.
1.2 USS - Modules Removing customer units: 1. Switch off the mains voltage, observe the waiting period. 2. Remove the cover grid from the connection area by loosening the 2 screws and levering out the device cover (slot) or simply pull it out. 3. Locking lever in the "open" position. 4. Using a screwdriver (as shown), lever the customer unit out of its engaged position and then remove it by hand. 5. Move the locking lever to the "closed" position. 6. Replace all covers.
NORD USS and Modbus RTU Manual 1.2.3 SK 300E Technology units and customer interfaces Through the combination of modules for the display, (technology units) and modules with digital and analog inputs, as well as interfaces, (customer units) or bus interfaces, the SK 300E can be easily adapted to the requirements of a wide range of applications. The NORD CON software can be used to carry out a simple function test of the serial interface and parameterisation of the inverter.
1.3 USS - Protocol speciication 1.3 USS Protocol Specification 1.3.1 General information The USS protocol defines an access procedure according to the Master/Slave principle for communication via a serial bus. A sub-set of this also includes point-to-point connection. A master and a maximum of 31 slaves can be connected to a bus. The individual slaves are accessed by the master via an address character in the telegram. Direct exchange of messages between the individual slaves is not possible.
NORD USS and Modbus RTU Manual 1.3.3 Data Coding STX (Start of Text): ASCII character: 02 Hex The start character forms the first character in the telegram and together with the start pause it is used for reliable detection of the start of the telegram. LGE (Telegram length): 1 Byte, contains the length of the telegram. The telegram length is located in the 2nd byte of the telegram and indicates the length of the telegram from the 3rd byte onwards.
1.3 USS - Protocol speciication 1.3.5 Transfer Procedure The USS protocol functions according to the master/slave principle, whereby the master is the control device (PC, SPS etc) and the slaves are the frequency inverters Only one slave can be addressed with each telegram (exception: broadcast telegram without response by the slaves).
NORD USS and Modbus RTU Manual 1.3.7 Response Delay Time The time interval between the last character of the order telegram (BCC) and the start of the response telegram (STX) is called the response delay time tAVZ. The maximum permissible response delay time is 20ms, however, it must not be smaller than the start pause. If the addressed participant does not respond within the maximum permissible response delay time, an error message is saved in the master.
1.4 USS - Bus structure 1.4 Bus Configuration 1.4.1 General information The basis for the physical interface of the USS protocol is the 'Recommended Standard RS-485' For point-to-point connections, a sub-set of EIA RS-232 (CCITT V.24), TTY (20mA current loop) or optic fibre cable can be used as the physical interface. SK 300E and SK 500E series inverters are always configured with an RS485 interface on the terminal connection bar or connector.
NORD USS and Modbus RTU Manual 1.4.4 Installation of the Bus System In an industrial environment the correct installation of the bus system is particularly important in order to reduce potential interference. The following points are designed to help prevent interference and problems right from the start. The installation guidelines are not complete and applicable safety and accident prevention guidelines must be complied with. 1.4.4.
1.4 USS - Bus structure 1.4.4.2 Cable runs / Shielding (EMC) If EMC measures are not in place, high-frequency interference which is principally brought about by switch procedures or lightning often causes electronic components in the Bus participants to become faulty and errorfree operation can no longer be ensured. Proper shielding of the bus cable reduces the electrical interference which can arise in an industrial environment.
NORD USS and Modbus RTU Manual 1.5 Data transmission 1.5.1 Structure of reference data This section describes the cyclic data traffic between the master and the frequency inverter. The reference data is divided into two sections: PKW section (Parameterisation; Parameter Identification- Value) PZD section (Processdata) Parameter values can be read and written via the PKW section of the reference data.
1.5 USS - Data transfer 1.5.2 PPO types For cyclic data traffic, the Parameter- Process data Object (PPO) with which the process data (PZD) and parameters (PKW) are transferred from the master to the frequency inverter is defined. The frequency inverter can process PPO types 1, 2, 3 or 4.
NORD USS and Modbus RTU Manual 1.5.2.1 PPO types SK 300E/700E/750E The following diagram shows an overview of the supported PPO types. PKW PKE 1st word IND PZD PWE 2nd word 3rd word PWE 4th word PZD1 PZD2 PZD3 PZD4 STW SW1 SW3 SW2 ZSW IW1 IW3 IW2 5th word 6th word 7th word 8th word 1st word 2nd word 3rd word 4th word PPO 1 PPO 2 PPO3 PPO4 1.5.2.2 PPO types for SK 500E series The following diagram shows an overview of the supported PPO types.
1.5 USS - Data transfer 1.5.3 Process data (PZD) In the process data area PZD, control words and setpoints are transferred from the master to the slave (frequency inverter) and in return, status words and actual values are sent from the slave to the master.
NORD USS and Modbus RTU Manual 1.5.3.3 Control word (STW) The control word (STW) is the first word transferred to the frequency inverter in the process data area in an order telegram. For example, a control word "Ready for switch-on" corresponds to 047E(hex).
1.5 USS - Data transfer 1.5.3.4 Status word (ZSW) In the inverter response telegram, in the area of the process data the status word (ZSW) is transferred as the first word. For example, the status word "Ready for switch-on" corresponds to 0B31(hex).
NORD USS and Modbus RTU Manual Deviations in the status word (ZSW) for SK 300E and SK 700/750E series devices With the above device types, the meanings of the two bits 10 and 13 in the status word deviate from the status word of the SK 500 E.
1.5 USS - Data transfer Setpoint position (16 or 32 Bit) With the special extension Posicon (SK XU1-POS) of the SK 700E the absolute setpoint position can be transferred as a 16 or 32 Bit value in Setpoint 1, whereby the resolution is 1=0.001 rotation. In addition, the control terminals (setting of POSICON control bits) can be transferred in binary.
NORD USS and Modbus RTU Manual 1.5.3.6 Second and third setpoint (SW2/3) With the SK 500E, the assignment of setpoints 2 and 3 to the process data words PZD3 and PZD4 is carried out in the opposite manner to the SK 300E/700E/750E series. Second and third setpoint SK 300E/SK 700E/SK 750E(SW2/3) If the PPO type 2 or 4 is used, in addition to setpoint 1, a 2nd setpoint can be transferred in word PZD4 and a 3rd setpoint in PZD3.
1.5 USS - Data transfer Second and third setpoint SK 500E (SW2/3) In addition to setpoint 1, a second setpoint can be transferred in word PZD3 and a third setpoint in PZD4. PZD1 PZD2 PZD3 PZD4 STW SW1 SW2 SW3 The second and third setpoints are always 16 Bit. The function of the second and third setpoints can be set in the inverter with parameter P547 „Setpoint 2 function‟ and P548 „Setpoint 3 function‟ respectively. Both setpoints are transferred as whole numbers in the range -32768 to 32767.
NORD USS and Modbus RTU Manual 1.5.3.7 Actual value 1 (IW1) The actual value 1, i.e. the actual output frequency of the inverter, is transferred as a 16 Bit value as standard in the actual value 1. The actual value 1 is transferred to the master in the inverter response telegram as the second word in the process data area. PZD1 PZD2 PZD3 PZD4 ZSW IW1 IW2/3 IW3/2 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 The actual value 1 is transferred as a whole number in the range (-32768 to 32767).
1.5 USS - Data transfer Second and third actual value SK 300E/SK 700E/SK 750E(SW2/3) The actual value 2 (IW2) is transmitted in PZD4. The value to be transferred can be selected in P544 (actual bus value 2). Actual value 3 (IW3) can be transmitted in PDZ3 if actual value 1 is not a 32 Bit value. The value to be transferred can be selected in P545 (actual bus value 3). Second and third setpoint SK 500E (SW2/3) The actual value 2 (IW2) is transmitted in PZD3.
NORD USS and Modbus RTU Manual 5 Internal status machine Sw itching on the inverter Bit2 = 0: Emergency stop 1 Not on standby 3 4 5 6 6 8 Bit1 = 0: Disable voltage v Bit2 = 0: Emergency stop Loading relay applied Emergency stop active 2 f = 0 reached (emergency stop complete) 2 4 Sw itch-on disabled 5 From any device status Bit0 = 0: Shut dow n & Bit1 = 1: Enable voltage & Bit2 = 1: Enable pulses (xxxx x1xx xxxx x110) Bit0 = 0: Shut dow n Error 3 2 5 7 Ready for sw itch-on 5 Bit
1.5 USS - Data transfer 1.5.4 Parameter range (PKW) Using the PKW mechanism, parameter processing can be carried out in the cyclical data traffic. For this the master formulates an order and the inverter formulates the response to this. The parameter area is only used for transfer with PPO type 1 and PPO type 2. In principle, the parameter range consists of a parameter identification, in which the type of order (Write, Read etc.) and the relevant parameters are specified.
NORD USS and Modbus RTU Manual The following table lists all the orders which can be transferred from the master to the inverter. The righthand column contains the response, which is normally sent (response label positive). Only certain response labels are possible, depending on the order label. In case of error (response label negative) the inverter will always supply the value 7 in the response label (AK) to the master.
1.5 USS - Data transfer Error messages if the order cannot be executed If the response label is "Order cannot be executed" (AK = 7), then an error message is added to the parameter value (PWE2) of the inverter response. For the meanings of the transferred values , please refer to the following table. 1.5.4.2 No.
NORD USS and Modbus RTU Manual 1.5.4.3 Parameter value (PWE) According to the type of the PPO or parameter, transfer of the parameter value (PWE) is always as a word (16 Bit) or double word (32 Bit) Only one parameter value can be transferred in a telegram. A 32 bit parameter value comprises PWE1 (high value word) and PWE2 (low value word, 4th word). A 16 Bit parameter value for PPO1 and PPO2 is transferred in PWE2. For negative values the High word must be set to FFFF hex.
1.6 USS – Telegram examples 1.6 Telegram examples Various example telegrams are shown below to clarify the control and parameterisation of the frequency inverter with the USS protocol. Note: When transferring parameter orders, it must be taken into account that the slave does not immediately respond to orders in the parameter channel of the master telegram, but a positive response can be delayed by one or more communication cycles.
NORD USS and Modbus RTU Manual 1.6.2 Switch-on block Standby A frequency inverter with the USS address 0 is to be switched from the status "Switch-on disabled" (STW Bit 0 – 0), which is active when the device is switched on, to the "Standby" status (STW Bit 0 = 1). Parameter set 1 is valid and no parameter data is transfered.
1.
NORD USS and Modbus RTU Manual 1.6.3 Enable with 50% setpoint A frequency inverter with the USS address 10, which is in "Standby" status (Section 1.6.2) is to be enabled for clockwise rotation with 50% setpoint. The last response telegram was received as follows in the controller.
1.6 USS – Telegram examples 1.6.4 Writing a parameter When transferring parameter orders, it must be taken into account that the slave does not immediately respond to orders in the parameter channel of the master telegram, but a positive response can be delayed by one or more communication cycles. The master must therefore repeat the required order until the corresponding slave response is received. The acceleration time parameter (USS No.
NORD USS and Modbus RTU Manual 1.6.5 Reading the acceleration time parameter The acceleration time parameter (USS No. = 102dec / 66hex) in parameter set 2 of a frequency inverter with the USS address 3, is to be read out. No process data is transferred.
1.7 USS - Master- Telegram times 1.7 Master Telegram Times The telegram times to be monitored depend on the currently valid baud rate and the telegram length.
NORD USS and Modbus RTU Manual 1.8 Frequency Inverter Settings 1.8.1 Frequency inverter bus parameters To operate the inverter with the USS protocol, the bus must be connected to the master and some settings must be made on the frequency inverter. The frequency inverter can always be parameterised. Control of the inverter via USS can be activated by setting parameter P509 to value 2, 3 or 4 (for SK 500E to 2) (see below).
1.8 USS – Frequency inverter settings 1.8.1.2 Extra functions Parameter P502 1 ... 24 {0} Setting value / Description / Note Comments ... [-01] … Master function value (Master function value) ... [-05] SK 5xxE Selection of master values (up to SK 535E: max. 3 master values, SK 540 and above: max.
NORD USS and Modbus RTU Manual Parameter P509 0 ... 21 {0} Setting value / Description / Note Comments Interface SK 300E, SK 700E, SK 750E (interface) Selection of the interface from which the inverter is controlled. 0 = Control terminal or keyboard control with the Control Box (option) ,the ParameterBox (option) or the Potentiometer option 1 = Control terminals only, the inverter can only be controlled via the 4 digital inputs and the analog input.
1.8 USS – Frequency inverter settings Parameter P511 0 ... 7 {3} Setting value / Description / Note USS baud rate (USS baud rate) Setting of the transfer rate (transfer speed) via the RS485 interface. All bus participants must have the same baud rate setting. 0 = 4800 Baud 4 = 57600 Baud (SK 54xE) 1 = 9600 Baud 5 = 115200 Baud (SK 54xE) 2 = 19200 Baud 6 = 230400 Baud (SK 54xE) 3 = 38400 Baud 7 = 460800 Baud (SK 54xE) NOTE: P512 0 ... 30 {0} P513 -0.1 / 0.0 / 0.1 ... 100.0 s { 0.
NORD USS and Modbus RTU Manual Parameter P543 (P) Setting value / Description / Note Comments Bus – Actual value 1 (Bus – Actual value 1) 0 ... 12 (24) The return value 1 (IW1) can be set for bus control in this parameter.
1.8 USS – Frequency inverter settings Parameter P546 (P) Setting value / Description / Note Comments Function Bus setpoint 1 (Function of bus setpoint 1) 0 ... 7 (47) In this parameter, a function is assigned to the delivered setpoint 1 (SW1) for bus control. {1} NOTE: Further details can be found in the respective FI manual or in the description of P400.
NORD USS and Modbus RTU Manual Parameter Setting value / Description / Note Function Bus setpoint 3 P548 (P) except SK 54xE (Function of bus setpoint 3) 0 ... 46 (47) {0} Comments In this parameter, a function is assigned to the delivered setpoint 3 (SW3) for bus control. This is only available if P546 3 (only applies for SK 700E / SK 750E). For setting values, see parameter (P547) 1.8.1.3 Information parameters NOTE As of firmware version V1.
1.8 USS – Frequency inverter settings Parameter P740 ... [-01] data Bus In … Process (Process data Bus In) ... [-23] 0000 ... FFFF (hex) P741 Comments Setting value / Description / Note SK 540E / SK 545E This parameter informs [-01 ] = Control word about the actual control word and the setpoints that are transferred via the bus [-02] = Setpoint 1 [-03] = Setpoint 2 systems.
NORD USS and Modbus RTU Manual Parameter P741 ... [-01] data Bus Out … Process (Process data Bus Out) ... [-13] 0000 ... FFFF (hex) P741 SK 500E to SK 535E This parameter provides [-01] = Status word information about the actual status word and the actual [-02] = Actual value 1 (P543) values that are transferred via [-03] = Actual value 2 (P544) the bus systems. [-04] = Actual value 3 (P545) Status P509.
1.8 USS – Frequency inverter settings Parameter Comments Setting value / Description / Note Database version P742 (Database version) 0 ... 9999 Displays the internal database version of the FI. Configuration level P744 SK 300E, SK 700E, SK 750E (Configuration level) This parameter displays the option modules detected by the FI. 0 ... 9999 The display with the ParameterBox is in plain text. The possible combinations are displayed in code in the ControlBox.
NORD USS and Modbus RTU Manual Parameter Setting value / Description / Note Module status P746 SK 300E, SK 5xxE (Module status) 0000 ... FFFF (hex) Comments Indicates the actual status (readiness, error, communication) of the technology unit (SK TU2/3-xxx), but only when own processor is present, therefore not for the SK TU2/3-CTR. Code details can be found in the respective BUS module manual. Different contents are shown depending on the modules. P746 ... [-01] … Module status (Module status) ..
2.2 Modbus RTU - Features 2 Modbus RTU (SK 540E and above) 2.1 The bus system Modbus is an open communication protocol, which is based on a Master/Slave architecture. The bus system must be set up in a linear configuration, whose ends are terminated with terminating resistors. In principle, up to 256 participants are possible within a bus system. These communicate with each other via RS485. 2.
NORD USS and Modbus RTU Manual 2.3 Telegram Structure The address field consists of eight Bits, which represent the address of the recipient. In its response, the Slave returns this address to the Master, so that the master can identify the response. The function field consists of 8 Bits. These encode how the content of the data field is to be interpreted. If the Slave has received the query from the Master correctly, it responds with the same function code.
2.5 Modbus RTU: Function codes 2.5.1 01h Read Coil This function enables the readout of inverter bits. The addresses of the bits are listed in the "Coil List". Master Slave Slave Master Function Code 1 Byte 0x01 Function Code 1 Byte 0x01 Start address 2 Byte 0x0000 to 0x000F Number of bytes 1 Byte 1 to 2 Number of bits 2 Byte 1 to 16 Status of bits n Byte Example: 4 bits are queries from the address 0x0008 (Bus OUT bits 1 to 4).
NORD USS and Modbus RTU Manual 2.5.3 0Fh Write Multiple Coils Via this access, all of the 8 writable coils can be switched simultaneously. Master Slave Slave Master Function Code 1 Byte 0x0F Function Code 1 Byte 0x0F Start address 2 Byte 0x0000 to 0x0007 Start address 2 Byte 0x0000 to 0x0007 Number of Coils 2 Byte 0x0001 to 0x0008 Number of Coils 2 Byte 0x0001 to 0x0008 Number of bytes 1 Byte 1 Example: Bus IN Bits 2, 4 and 5 are set from start address 0x0001.
2.5 Modbus RTU: Function codes 2.5.4 03h Read Holding Register This enables the readout of one or more parameters. However, usually only a single 16Bit format parameter can be read out. The function code 0x10 must be used for 32Bit parameters. The only exception to this are the process parameters P050 and P051. Here, all the elements of the array assigned to the parameter can be read out simultaneously.
NORD USS and Modbus RTU Manual 2.5.5 06h Write Single Register Enables writing of a single 16Bit parameter. Master Slave Slave Master Function Code 1 Byte 0x06 Function Code 1 Byte 0x06 Address 2 Byte 0x0000 to 0xFFFF Address 2 Byte 0x0000 to 0xFFFF Parameter Value 2 Byte 0x0000 to 0xFFFF Parameter Value 2 Byte 0x0000 to 0xFFFF Example: Parameter P102, parameter set 2 is written with the value 0x0123 (see also the item "Parameter access" in Section 2.8 Description of parameters).
2.5 Modbus RTU: Function codes Example 1: Parameter P613 [0] is written with the value 0x00123456.
NORD USS and Modbus RTU Manual 2.6 Exception Responses If a query by the Modbus Master cannot be answered correctly, an error message is sent instead of the normal response. The error message is structured as follows: Slave Master Function Code 1 Byte 0x80 + Function code of the Master query Exception Code 1 Byte 0x01 to 0x06 Exception Code 01h 02h 03h 04h 06h Description A function code has been sent, which is not supported by the FI.
2.8 Description of parameters 2.8 Description of parameters Coil List Via the Coil List it is possible to obtain direct access to the Bus IN/OUT bits. In order for these bits to function, they must be parameterised in parameter P480 and P481 and the control word and setpoint must be parameterised to the setting "Control terminals" via P509/P510.
NORD USS and Modbus RTU Manual Parameter access The FI parameters cannot be directly accessed via the functions 03h, 06h or 10h, as many FI parameters have array elements. Therefore, the addresses for NORD parameters are according to the following model: Start address Bit 15 – Bit 6 Bit 5 – Bit 0 Parameter number Array Index The lower 5 bits are available for the array elements, so that the maximum array size is 63. The parameter values are shifted by 6 places.
3 Faults 3 Faults 3.1 Troubleshooting The majority of frequency inverter functions and operating data are continuously monitored and simultaneously compared with limiting values. If a deviation is detected, the inverter reacts with a warning or an error message. Basic information on this topic is contained in the manual for the basic equipment. Errors cause the frequency inverters to switch off, in order to prevent a device fault. The following options are available to reset a fault (acknowledge): 1.
NORD USS and Modbus RTU Manual 3.2 Error messages Table of possible bus-specific error messages Display in the ControlBox Cause Fault Group Details in Text in the ParameterBox P700 / P701 E010 10.0 10.2 10.4 10.1 (Bus Timeout) Remedy Telegram timeout, data transfer is faulty. Check P513. Bus Timeout Option Init error Option Check external Bus connection. Check bus protocol program process. Check Bus Master.
4 Additional information 4 Additional information 4.1 Maintenance and servicing information In normal use, NORD frequency inverters and their accessories are maintenance-free. If air intake filters have been built into the control cabinet, then these should also be regularly cleaned or replaced. If you contact our technical support, please have the precise device type (name plate/display), accessories and/or options, the software version used (P707) and the series number (name plate) at hand.
NORD USS and Modbus RTU Manual 5 Keyword index PPO type (P507) ........................ 52 A Actual bus value 1 (P543) ........... 56 H Hyst. Bus IO Out Bits (P483)...... 51 Actual bus value 2 (P544) ........... 56 Actual bus value 3 (P545) ........... 56 Actual value ................................ 37 Assembly .................... 9, 13, 16, 18 Auxiliary bus setpoint (P510) ...... 53 PPO types .................................. 27 Process Bus Out (P741) ....... 61, 62 Process data ..................
5 Keyword index BU 0050 GB 75
Subject to technical amendments BU 0050 GB-3111 Part. No.
