Cfw 08 manual

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Actions Shares. No notes for slide. P 6 Ganho da Entrada 0. De acordo com o modelo do inversor Mensagens de Erro III. Also resets inverter after a fault has occurred. To change the frequency reference before starting the inverter, the value of the parameter P, must be changed. The parameter are 5. Example of programming error: Programming of two digital inputs DI with the same function.

Refer to Table 5. Please find below some symbols used in this chapter: 6. This control mode is suitable for applications like centrifugal pumps and fans loads with quadratic torque x speed characteristics , since it enables a motor loss reduction, resulting in an additional energy saving by using an inverter.

As the reference, the inverter commands can de defined in several ways. The command sources are the following: via keypad - keys via control terminals XC1 - digital inputs; The use of the password is always active. This backup function is only applicable to the keypad Backup reference.

P Multispeed is used when the selection of a number up to 8 pre- Multispeed Ref. P, according to the logical combination of the digital inputs programmed for multispeed. P Defines the maximum and minimum output frequency motor Minimum Frequency [ 3.

Item 4. The CFW vector control operates without motor speed sensor sensorless. It must be applied when following performances are required: - better dynamics faster accelerations and stoppings ; Reference Scale [ 1. P related to inverter B. Analog Input AI1 [ 0. Analog Input AI2 [ 1. When the option 'Not used' has been programmed, the relay output s will be disabled, i. Page 98 In applications where the motor current is lower than the rated inverter current, and where the braking torque is not enough for the braking condition, please contact WEG to optimize the settings.

Page 99 Sets the address of the inverter for the serial communication. Modbus-RTU [ 1 ] This parameter can be changed only with the inverter disabled motor stopped. The WEG protocol is described in Item 8. The Modbus-RTU protocol, described in item 8. Power inverter model ] Rated Motor power P 0. Motor Resistance [ According to The table in item 9. P 6. This function acts as a proportional, integral and derivative regulator, superimposed on the normal inverter speed control.

The speed will be changed in order to maintain the process variable the variable that should be controlled - for instance: water level of a container at the desired value, set in the setpoint. Thus when DI3 is open, the manual mode is activated and when DI3 is closed, the PID regulator starts to operate closed loop control - automatic mode.

The inverter setting must be correct in order to obtain a good performance of the PID regualtor. Also instructions about required periodical inspections and cleaning procedures are also provided. When a fault is detected, the inverter is disabled and the fault code is 7.

Electrical noise. Program Memory refer to section 7. The faults act as follows: E When contacting WEG for services, please have the following data on hand: Inverter model; serial number, manufacturing date and hardware revision, as indicated on the inverter nameplate refer to section 2.

Page Cleaning Instructions Never apply a high voltage test on the inverter! If this is necessary, contact WEG. To avoid operation problems caused by harsh ambient conditions, such as high temperature, moisture, dirt, vibration or premature ageing of the components, periodic inspections of the inverter and installations are recommended.

Page CFW Table below shows a list of existing optional devices and the types to which they are applied. Setting of P too high. Overtemperature Auto-reset Blower locked or defective. DI E05 P set too low for the motor that is being used.

E08 Electrical noise. Program Memory refer to section 7. Keypad Manual key Electrical noise in the installation Error Auto-reset electromagnetic interference. DI E14 Power-on Motor is not connected to the inverter output. Self-Tuning Manual key Wrong motor connection wrong voltage, lack of one Fault phase.

The value of P stator resistance is too high for the used inverter. E24 It is automatically reset Incompatible parameters were programmed Programming when the incompatible Refer to table 5. Keypad HMI when the communication Electrical noise in the installation electromagnetic Connection Fault between inverter and the interference.

Self- Diagnosis refer to section 7. Note: 1 In case of E04 Fault due to inverter overtemperature, allow the inverter to cool down before trying to reset it. Please check blower installed inside.

Long motor cables longer than ft 50 m can generate excessive capacitance to ground. This can cause nuisance ground fault trip and consequently disabling by E00 fault immediately after the inverter has been enabled.

Solution: Reduce the switching frequency P Connect a load reactor in series with the motor supply line. The faults act as follows:. E Indicates the fault code on the LED display. E Inverter proceeds to operate normally, but it does not accept the keypad commands; the fault code is indicated on the LED display. Inverter is powered up and is ready.

A fault has been detected. The Error LED flashes, indicating the number of the fault code. Example: E Check the power and the control connections. Analog reference 1. Check if the external signal is properly connected.

Check the status of the speed potentiometer if used. Incorrect Programming 1. Check if the parameters are properly programmed for the application. Fault 1. Check if the inverter has not been disabled due to detected fault condition refer to Table above.

Motor Stall 1. Reduce the motor load. Disable the inverter, switch OFF the power supply and tighten all varies connections. Replace the defective speed potentiometer. Variation of the external 1. Identify the cause of the variation. Check if the contents of P minimum frequency too high or reference limits and P maximum frequency are according to the motor too low application.

Signal of the 1. Check the control signal level of the reference. Reference Control 2. Check the programming gains and offset at P to P Motor nameplate 1. Check if the used motor meets the application requirements. Check the keypad connections to the inverter. Power supply 1. When contacting WEG for services, please have the following data on hand: Inverter model; serial number, manufacturing date and hardware revision, as indicated on the inverter nameplate refer to section 2. Even after switching OFF the inverter, high voltages may be present.

Wait 10 minutes to allow complete discharge of the power capacitors. Always connect the equipment frame to a suitable ground PE point. Electronic boards have components sensitive to electrostatic discharges.

Never touch the components or connectors directly. If this is unavoidable, first touch the metallic frame or use a suitable ground strap. Never apply a high voltage test on the inverter! If this is necessary, contact WEG. To avoid operation problems caused by harsh ambient conditions, such as high temperature, moisture, dirt, vibration or premature ageing of the components, periodic inspections of the inverter and installations are recommended.

If the inverter is stored for long periods, we recommend to power it up once a year during 1 hour. For all models V or V apply supply voltage of approx. After this energization, wait 24 hours before installing it.

Remove all dust from ventilation openings by using a plastic brush or a soft cloth. Remove dust accumulated on the heatsink fins and from the blower blades with compressed air.

Disconnect the inverter cables, ensuring that they are marked carefully to facilitate later reconnection. Remove the keypad and the plastic cover refer to section 3. Table below shows a list of existing optional devices and the types to which they are applied. Are also given information about the optional devices and their application.

HMI parallel keypad. Copy Function. Place the keypad as shown above. Unlock the keypad by using a screwdriver as shown above. Press it. Remove the keypad by pulling on the lateral sides. Table 8. This function is useful when one wants to copy the settings of one inverter source inverter to another target inverter or one needs to program several inverters with the same settings. The keypad copy function is controlled by the paramater P For further information on this function refer to section 6.

Keypad Inverter. The RS serial interface enables the point-to-point connection inverter - master. It is gavanically isolated and enables the use of interconnecting cables in lengths up to 10 m. The maximum transfer rate is bps. For the RS serial communication, both point-to-point an inverter and a master or multipoint up to 30 inverters and one master , you can connect the KCS-CFW08 module to an external MIW module - for more details, refer to section 8.

Front View B Section B-. Figura 8. Bottom View Bottom View. So the inverter can participate in a multipoint line up to m without the use of transducers.

For more details about this connection, see item 8. The communication protocols supported by this serial interface are detailed in items 8. WEG network RS This electromagnetic interference may disturb the operation of the inver- ter itself or other devices, such as electronic sensors, PLCs, transducers, radio equipment, etc. To avoid these troubles, follow the installation instructions contained in this Manual.

In this case, avoid the installation of electromagnetic noise generating circuits, such as power cables, motors, etc. Care should also be taken with the radiated interference, by shielding the cables and the circuits that tend to emit electromagnetic waves and can cause interference.

The electromagnetic interference can also be transmitted through power supply line. This type of interference is minimized in the most cases by capacitive filters which are already installed inside the CFW However, when inverters are installed in residential areas, the installation of additional filter may be required. These filters may be installed internally on some types or externally. As defined in standards, the Class B filter has more attenuation capacity than the Class A filter , thus being more suitable for residential areas.

Section 8. The inverters with internal Class A filters have the same external dimensions as the inverters without filter. The external Class B filters must be installed between the power supply line and the inverter input, as shown in Figure 8. Instructions for the RFI filter installation: Install the inverter and the filter on a metallic grounded plate as near to each other as possible and ensure a good electrical contact between the grounded plate and the inverter and filter frames.

For motor connection use a shielded cable or individual cables inside a grounded metallic conduit. For installations that must meet the European standards refer to item 3.

Ground Install it as close as Motor Ground possible to the frame inverter. These harmonic currents circulate through the power supply line and cause harmonic voltage drops which distort the power supply voltage of the inverter and other loads connected to this line. These harmonic currents and voltage distortions may increase the electrical losses in the installation, overheating the components cables, transformers, capacitor banks, motors, etc. The installation of a line reactor reduces the harmonic content of the input current, providing the following advantages: increasing the input power factor; reduction of the RMS input current; reduction of the power supply voltage distortion; increasing the life of the DC link capacitors.

But in this case, ensure the following: To ensure the inverter expected life, a minimum line impedance that introduces a voltage drop as shown in table 8. This pratice is results in a compromise between motor voltage drop, power factor improvement and harmonic current distortion reduction.

This practice results in a compromise between motor voltage drop, power factor improvement and harmonic current distortion reduction.

Always add a line reactor, when capacitors for power factor correction are installed in the same line and near to the inverter. Use the following equation to calculate the value of the line reactor necessary to obtain the desired percentage of the voltage drop:. L N Line Shield. R S T Line Shield. This practice reduces the voltage spikes on the motor windings and the leakage currents that may be generated when long cables between inverter and motor as a function of the "transmission line" effect are used.

There are many factors that influence the peak level Vp and the rise time tr of voltage spikes: cable type, cable length, motor size, switching frequency and so on. WEG recommends using a load reactor when the supply voltage is higher than V, though this is not always required.

The load reactor value is calculated in the same way as the line reactor see item 8. If the cables between inverter and motor are longer that ft m , the cable capacitance to ground may cause nuisance overcurrent E00 trips.

In this case it is also recommended to use a load reactor. For the correct sizing of the braking resistor, application data such as, deceleration time, load inertia, braking duty cycle must be considered. In any case, the rms current capacity and the maximum peak current must be considered. The maximum peak current defines the minimum permitted ohmic value for the braking resistor.

Refer to table 8. The DC link voltage level for the actuation of the dynamic braking is as follows:. Inverter supplied with During the deceleration process, the kinetic energy of the load is regenerated into the inverter DC link. This energy loads up the capacitors by increasing the DC link voltage.

When this energy is not fully dissipated, it may generate a DC link overvoltage trip E01 and disabling the inverter. To obtain higher braking torques, the use of dynamic braking is recommended where the excess of the regenerated energy is dissipated in a resistor mounted externally to the inverter. The braking resistor is defined according to the deceleration time, load inertia and resistive torque.

Use wire type or tape type resistors with suitable insulation to withstand the instantaneous current peaks. For critical applications with very short braking times, high inertia loads ex.

Make this connection with a twisted pair. Run this cable separately from any signal or control wire. Size the cable cross section according to the application, by considering the maximum and the rms current.

If the braking resistor is installed inside the inverter panel, consider the heat dissipated by the resistor when defining the panel ventilation. The subjects broached in this Section refers to WEG protocol.

For more details about the Modbus- RTU, see item 8. Typical examples of network use: PC master for the parametrization of one or several inverters at the same time; SDCD monitoring inverter variables; PLC controlling the operation of one or more inverters in a industrial process. RS point-to-point up to 10m ; b. RS multipoint, galavanic isolation, up to m ;. In addition to these 30 addresses, there are two addresses to perform special tasks: Address 0: any inverter in the network is inquired, independently of its address.

Only one inverter can be connected to the network point-to- point in order to prevent short-circuits in the line interface. Address a control can be transmitted to all inverters in the network simultaneously, without acceptance recognition.

The connection between the network participants is performed through a pair of wires. When the master is fitted only with a RS serial interface, you must apply a level conversion module from RS to RS In this case one wire is used for the transmission TX , one wire for the reception RX and one wire for the return 0V.

This configuration is a three wire economy model. Variables: are values that have specific inverter functions and that can be read and, in some cases, modified by the master. Basic variables: are those that can be accessed only through the serial interface. All variables are considered as signed variables, except those related to time time, period, frequency, In addition, the maximum and minimum values must consider the parameter range limits.

The below shows the main variables and their respective resolutions. Parameter Unit Resolution Frequency H 0. After the start bit, follows the less significant bit:. Start Stop 8 bits of information bit bit. Only text character sequences without headers are used. The parity monitoring is made according to DIN even parity. NOTE: No transmission between two inverters is possible.

The master has the bus access control. In the answer message, the inverter transmits the data requested by the master and it finishes the transmission with EOT. The inverter will answer by indicating if the data have been accepted or not.

Format of the inverter answer message: Acceptance: ADR: inverter address. Without Acceptance: ADR: inverter address. This means that the data were not accepted and the addressed variable continues with its old value. Message Test The answers for the respective verified conditions are defined as follows:.

Reading Message: no answer: with wronG message structure, control characters received incorrectly or wrong inverter address; NAK: CODE corresponding to a non existing variable or there is only a writing variable; TEXT: with valid messages.

Writing Message: no answer: with wrong message structure, control characters received incorrectly or wrong inverter address; NAK: CODE corresponding to a non existing variable, wrong BCC checksum byte , only reading variable, VAL out of the allowed range for the respective variable, operation parameter out of the alteration mode; ACK: with valid message; The master should maintain, between two variable transmissions to the same inverter, a waiting time that is compatible with the used inverter.

Number of the basic variable or parameter. Reading of the output current from the inverter 10 supposing the the same was at 7. The reading of this variable permits the identification of the inverter type. For the CFW this values is 7, as defined in 8. Error Code: hexadecimal error number Ex. It order to enable the action, the corresponding bit should be set to 1.

Note: Disabling via DIx has priority over this disabling. Fault types: E longitudinal parity fault BCC ; E parametrization fault when some of the situations occurs as indicated in table 5.

E variable or parameter not existing; E expected values out of allowed limits; E writing attempt in a read only variable or logical command disabled; E serial interface watchdog timeout error. Note: If a parity fault is detected during inverter data reception, the message will be ignored. The same happens when syntax errors occur. Times ms Typical Tproc 10 Tdi 2 reading 15 Ttxi writing 3. You can not use RS and RS simultaneously. Currently it is a Modbus-RTU Protocol wide diffused open protocol, used by several manufacturers in different equipment.

ORG, may 8th In these documents are defined the format of the messages used by these elements that are part of the Modbus network, the services or functions that can be made available via network, and also how these elements exchange the data on the network.

The transmission modes define the form how the message bytes Modes are transmitted. It is not permitted to use the two transmission modes on the same network. In the RTU mode each transmitted word has one start bit, eight data bits, 1 parity bit optional and 1 stop bit 2 stop bits, if no parity bit is used. Thus the bit sequence for the transmission of 1 byte is as follows:. In the RTU mode each transmitted word has 1 start bit, eight data bits, 1 parity bit optional and 1 stop bit 2 stop bits, if parity bit is not used.

Thus the bit sequence for the transmission is as follows:. The master always initiates the communication with a question to a slave and the slave answers the question.

Depending on what is being requested, only the data field has variable length. The slave with the right slave address initiates the message with its own address.

The master can also send a message destined to address 0 zero , which means that the message is destined to all network slaves broadcast. In this case no slave will answer to the master. According to the protocol, each function is used to access a specific data type.

The format and the content of this field depend on the used function and transmitted values. This field and the respective functions are described in item 8. Then following steps are executed with the following routine:. The first message byte only the data bits - the start bit, parity bit and stop bit are not used is submitted to the XOR logic OR exclusive with the 8 least significant bits of the CRC variable, returning the result to the CRC variable, 2.

Then the CRC variable is displaced one position to the right, in the direction of the least significant bit and the position of the most significant bit is filled out with zero 0 zero.

After this displacement, the flag bit bit that has been displaced out the CRC variable is analyzed, by considering the following: If the bit value is 0 zero , no change is made. Repeat steps 2 and 3 until the eight displacements have been realized.

Repeat the steps 1 to 4, by using the next byte message until the whole message have been processed. Thus the only indication for the beginning or the end of a new message is the data transmission absence in the network by 3. Thus if a message is initiated after elapsing of the minimum time required without transmission, the network elements assume that the received character represents the beginning of a new message.

In similar mode, after this time has elapsed, the network elements will assume that the message has been ended. If during the transmission of a message, the time between the bytes is longer than this minimum required time, the message will be considered invalid, since the inverter will discard the already received bytes and will mount a new message with the bytes that are being transmitted.

The table below shows the time for three different communication rates. T3,5 x Tbetween bytes T3,5 x Signal. When the inverter is Modbus-RTU configured to the corresponding address, it processes the question and Network answers to the master as requested. There are two ways to perform the connection between the network master and the CFW Modbus-RTU Network 8.

Each slave shall have a different address. The master does not have address. The slave address must be known, even when connection is made point-to-point. Parity: None, odd parity, even parity. All slaves and even the network master must use the same baud rate and parity. Basic Variables: are the internal inverter variables that can be accessed only through serial interface. For instance, trough these basic variables you can change the speed reference, read the inverter status, enable or disable the inverter, etc.

Register: nomenclature used to represent both parameters and basic variables during data transfer. Internal Bits: bits that are accessed only through the serial interface and that are used for inverter status controlling and monitoring.

Item 8. In the Times CFW both parameters and basic variables are defined as being holding type registers referenced as 4x. In addition to these registers, it is also possible to access the internal controlling and monitoring bits directly referenced as 0x. Following services or functions are available in the CFW frequency inverter for accessing these registers: Read Coils Description: reading of internal register blocks or coils.

Function code: Broadcast: not supported Response time: 10 to 20 ms. Read Holding Registers Description: reading of register blocks of holding type.

Write Single Coil Description: writing in a single internal bit or coil. Broadcast: supported. Response time: 10 to 20 ms. Write Single Register Description: writing in a single register of holding type.

Broadcast: supported Response time: 10 to 50 ms. Write Multiple Coils Description: writing in internal bit blocks or coils. Broadcast: supported Response time: 10 to 20 ms. Write Multiple Registers Description: writing in register blocks of holding type. Broadcast: supported Response time: 10 to 50 ms for each written register. Read Device Identification Description: Identification of the inverter model. Broadcast: not supported.

Master uses address 0 to send messages that are common to all slaves broadcast. The and Offset parameters are available from address 0 zero on, whilst the basic variables are available from address on. In same way, the status bits are made available from address 0 zero on and the control bits are made available from address on.

Table below shows the addressing of bits, parameters and basic variables:. P h. V05 Dh. Bit 7 07 07h. Note: All registers parameters and basic variables are considered as holding type registers, referenced from or 4x, whilst the bits are referenced from or 0x. The status bits have the same functions of the bits 8 to 15 of the logic status basic variable 2.

These bits are available only for read, thus any attempt to write command returns error status to the master. The command bits are available to read and write and they have the same function of the logic command bits 0 to 7 basic variable 3 , however no requiring the use of the mask.

The basic variable 3 write influences the status of these bits. Please note the following during the message preparation:.

Values are always transmitted as hexadecimal values. The address of one data, the data number and the value of the registers are always represented through 16 bits. Thus these fields are transmitted by using two bytes high and low. To access the bits, and the form to represent one bit depend on the used function. The messages, both for enquiry and response, cannot be longer than bytes. The resolution of each parameter or basic variable is as described in item 8. This function has the following structure for the read and response messages the values are always hexadecimal, and each filed represents one byte :.

Each response bit is placed at a position of the data bytes sent by the slave. The first byte, from the bits 0 to 7, receives the first 8 bits from the initial address indicated by the master. The other bytes if the number of the read bits is higher than 8 remain in the same sequence. If the number of the read bits is not a multiple of 8, the remaining bits of the last byte should be filled out with 0 zero.

Example: reading of the status bits for general enable bit 1 and direction of rotation bit 2 of then CFW at the address As the number of read bits in the example is smaller than 8, the slave required only 1 byte for the response. The value of the byte was 02h, That as binary value will have the form The other bits, as they did not be requested, are filled out with 0 zero.

This function has following structure for the read and response messages the values are always hexadecimal values, and each field represents one byte :. Example: Read of the value proportional to the frequency value P and motor current P of the CFW at address Each register is always formed by two bytes high e low.

As this parameter have a decimal place indication, the real read value is As the current has two decimal resolution, the read value is 6. The bit value is Single Coil represented by using two bytes, where FF00h represents the bit that is equal to 1, and h represents the bit that is equal to 0 zero. It has the following structure the values are always hexadecimal, and each field represents one byte :.

For this function, the slave response is an identical copy of the query sent by the master. This function has Single Register following structure values are always hexadecimal values, and each field represents one byte :.

Example: write of the speed reference basic variable 4 equal to For this function, the slave response will be again a copy identical to the request made by the master. As already informed above, the basic variables are addressed from , thus the basic variable 4 will be addressed at Ch. The value for this variable is This function can be also used to write a single bit the values are always hexadecimal, and each field represents one byte. The value of each bit that is being sent is placed at a position of the data bytes sent by the master.

The first byte, in the bits 0 to 7, receives the 8 first bits by starting from the initial address indicated by the master. The other bytes if the number of inscribed bits is higher than 8 remain in sequence. If the number of inscribed bits is not a multiple of 8, the remaining bits of the last byte should be filled in with 0 zero.

As only three bits are written, the master needed only one byte to transmit the data. The transmitted values are in the three less significant bits of the byte that contains the value for the bits. The other bits of this byte remained with the value 0 zero. This function can also be used to write a single register the values are always hexadecimal values and each field represents one byte.

As the two parameters have a resolution of a decimal place for writing of 1. It has following structure. The fields are repeated according to the number of objects. This function permits reading of three information categories: Basic, Regular and Extended and each category are formed by a group of objects. The read code indicates which information categories are being read and if the objects are accessed individually of by sequence. In the example, the inverter supports 01 basic information in sequence , and 04 individual access to the objects.

The other fields for the CFW have fixed values. Example: read o basic information in sequence, starting from object 00, of a CFW at address Depending on the error type, inverter may answer or not to the master: When the master sends a message to an inverter configured at determined network address, the inverter will not response if: Error in the parity bit.

Error the CRC. Time out between transmitted bytes 3. Writing in data that cannot be changed only read register, or register that does not allow changing with enabled inverter or bits of logic status.

Writing in function of the logic command that has not been enabled via serial interface. The errors that may occur in the CFW during the message processing are errors relating to invalid function code 01 , invalid data address code 02 and invalid data value code The messages sent by the slave have following structure:.

Master requests from the slave at address 1 to write parameter 89 inexistent parameter :. Minimum line impedance: variable according to inverter model. Power-up: max. Output Current A 3 2. Motor Power 5 0. Output Current A 3 1. Output Current A 3 Motor Power 5 7. Voltage Volt. The rated current values are valid for the switching frequencies of 2. For higher switching frequencies, 10kHz and 15kHz, consider the values shown in the description of the parameter P refer to chapter 6.

For higher switching frequencies, 10kHz and 15kHz, consider the values shown at the description of the parameter P refer to chapter 6. The precise inverter sizing must consider the actual motor nameplate and application data. It can be programmed to operate as 1 reverse, VAC, 0. The data of the applied motor must be programmed at P to P and the value of P stator resistance obtained through the Self-Tuning parameter estimation via P The table below shows the data of WEG standard motors as a reference.

The values of the stator resistance is a mean value per phase considering the motors with temperature rise T of oC. The inverter will be considered as accept and approved automatically by the purchaser, when the purchaser does not give written notice within max. WEG will have no obligation or liability whatsoever to people, third parties, other equipment or installations, including without limitation, any claims for loss of profits, consequential damages or labor costs. Open navigation menu.