Service

• In case of operation with a variable frequency drive, check the parameter settings and match the motor data with the name plate data
• Check the fan/fan cover (grinding noises, vibration, resonance)
• Check the motor bearings and replace as necessary
• Consult NORD DRIVESYSTEMS

• If you're operating a machine using a variable frequency drive, check the parameter settings and match the motor data with the name plate data
• Check the motor fastening and modify as necessary
• Check the motor bearings and replace as necessary
• If a coupling is fitted between the motor and the gear unit, check the alignment and the coupling, and align as necessary
• If you've done all these things and you're still unsure, contact NORD DRIVESYSTEMS

• Check the motor connection on the terminal board
• Check the supply voltage and the control's protective device
• If operating a brake motor, check the functioning of the brake
• If operating with a back stop option, check the direction of rotation
• If you've tried all these things and nothing is working, consult with NORD DRIVESYSTEMS

• In case of a brake motor, check the brake's functioning
• Check the application with regards to heavy starting/design
• Check the motor monitor (temperature monitor, variable frequency drive, fuse)
• Check the motor control or wiring (Star-Delta circuit)
• In case of operation with a variable frequency drive, check the parameter settings and match the motor data with the name plate data
• Consult NORD DRIVESYSTEMS

• Check the motor control or wiring
• If possible, operate the motor in the delta circuit; if necessary, check or adapt the design considering overload
• Consult NORD DRIVESYSTEMS

• If the drive does not have a back stop, have qualified personnel swap two phases of the supply voltage
• Consult NORD DRIVESYSTEMS

• Check the voltage supply of the motor
• Check the motor connection
• Check the application for excess load
• If operating with a brake, check the functioning of the brake
• Consult NORD DRIVESYSTEMS

• Check the voltage supply
• Check the fuse/motor circuit breaker
• Check the design and modify as necessary
• Check the motor winding
• Consult NORD DRIVESYSTEMS

• Check the fan and clean the fan cover as necessary
• For variable frequency drive operation, check the minimum frequency/speed and install an external fan as necessary
• Check the switching frequency for the operating mode of the motor and change the design as necessary (impermissibly frequent switch-on may lead to motor overload) (see catalogue M7000)
• Check the design and change the required motor power as necessary
• In case of operation with a brake, check the functioning of the brake
• Check the ambient conditions and the mounting position with regard to cooling
• Consult NORD DRIVESYSTEMS

• Measure the contact resistance of the temperature sensor in the motor terminal box
• Consult NORD DRIVESYSTEMS

• Measure the contact resistance of the thermostat in the motor terminal box
• Consult NORD DRIVESYSTEMS

• Check the supply voltage of the brake
• If the brake is controlled via a rectifier, check the rectifier
• Measure the resistance at the brake coil
• Check the air gap of the brake/check the position of the brake
• Check the brake pad for wear
• Consult NORD DRIVESYSTEMS

For further information, refer to the M7000catalog

For further information, refer to the M7000catalog

For further information, refer to the M7000 catalog

For further information, refer to the M7000catalog

Get in touch with us via our service form or by phone.

• Check the mains voltage, and, if necessary, the control voltage (depending on the type of variable frequency drive)
• If necessary, return the variable frequency drive to NORD DRIVESYSTEMS for testing

• Check switch-on inhibit (P700[3])
• Ensure that no second enabling is active
• Check the enable signal in the information parameters (P708/P740)

• Set automatic starting in P428 to "On"
• Work through the respective operating instructions and ensure no steps were missed

• Check the motor data and match it with the name plate as necessary
• Check the motor and the motor cable
• Reduce the load
• Check the precise error message via P700[1] and pay attention to any further remedial measures in the operating instructions
• If necessary, return the variable frequency drive to NORD DRIVESYSTEMS for testing

• Check the motor’s load and speed (e.g. < 25 Hz). If necessary, allow the motor to cool down, reduce the load, or use an external fan
• Check the ohmic resistance (e.g. TF ≈ 200 Ω/20 °C) and the PTC resistor connection

• Check the input voltage quality
• Check the motor data (P201–P208)
• Increase the ramp time in P103 as necessary
• Use a suitable braking resistor
• For "oscillating" applications, you can reduce the slip compensation (P212) or set a linear V/f characteristic curve by setting the parameters P211 and P212 to 0%
• Adjust the parameter P217 as necessary (e.g. 200%)
• You can adjust the disconnection mode in P108

• Determine the error code from the flashing code of the DS LED or read it out via parameter P700
• Afterwards, determine the suitable measures from the operating instructions

Check the encoder connection and the direction of rotation via P735 and adjust P301 as necessary.

• Check the BUS telegram from the external PLC
• Check the telegram time-out in P513

EMC is a highly complex topic for which there is no general answer. EMC interference may occur in the control inputs (digital/analog input, encoder, bus system), and may lead to unwanted signals, faults or even damage. In case of problems, contact a qualified EMC specialist.

General measures to avoid EMC:

• Properly shield the variable frequency drive to minimize electromagnetic interference
• Use components for interference suppression such as filters, chokes and capacitors can reduce noise and electromagnetic emissions
• Use well-shielded high-quality cables, and minimize long cable lines
• Use proper earthing to minimize electromagnetic interference (e.g. TI 80_0019)
• Properly install the machines according to the manufacturer’s instructions and relevant standards (e.g. TI 80_0019, TI 80_0011)
• Separate high-voltage and low-voltage cables
• Balance the mains
• Be careful of wires twisting
• Use cable ferrites to reduce existing interference

• Check the system for faulty connections, insulation faults or defective devices
• Pay attention to the variable frequency drive’s functional residual currents (TI 800_000000003)
• A or AC residual current protective devices are not permissible as protective devices. If necessary, retrofit to an all-current sensitive B(+) RCD (e.g. Doepke DFS 4B SK) (TI 800_000000003). Please observe the relevant regulations and standards.
• In IT networks, the variable frequency drive's jumper or DIP switch used for functioning must be plugged/switched to IT. This partly deactivates the integrated line filter and reduces residual currents. EMC interference can thus enter the network unfiltered.
• If any other problems arise, look to the operating instructions of the variable frequency drive.

• A motor choke is inserted between the variable frequency drive's output and the motor.
• It can help to reduce electromagnetic interference, protect the motor against excessive voltage and current peaks, and avoid resonances.
• To reduce the motor cable’s interference signals
• Cable capacity compensation in case of long motor cables. An output choke should be fitted for motor cable lengths over 100 m/30 m (unshielded/shielded).

• There are input chokes and link circuit chokes (before the variable frequency drive/in the link circuit)
• A mains choke protects the motor against any impact from the variable frequency drive, and improves the motor operation. For powers of 45 kW and higher, the general use of a mains choke is recommended
• EMC interference immunity; reduction of current peaks, voltage peaks and harmonics
• Increase of efficiency due to lower input currents
• Extension of the link circuit capacitors’ service life in the variable frequency drive
• If the proportion of the installed inverter power exceeds 20% of the installed transformer power
• For very hard mains or capacitive compensation systems
• In case of frequent switching of large consumers connected in parallel
• When using contact rail systems, the use of a mains or link circuit choke is recommended

• A braking resistor on a variable frequency drive is required if the motor is moved by external power sources (generator operation of the motor)
• Back-flowing current can cause faults in variable frequency drives
• The braking resistor absorbs excess power and dissipates it in the form of heat
• Particularly, in case of high motor inertia or fast braking, a braking resistor is often essential

You can use our application guide that describes the procedure of commissioning any parameters (e.g. AG0100, AG0101)

• General information can be found in the BU0040 manual, however you can parameterize a NORD variable frequency drive by:
• Using our NORDCON parameterization software. You need a parameterization cable (e.g. SK TIE4-RS232-USB) or an Ethernet bus connection (frequency inverter/PC)
• Using a ControlBox or a ParameterBox, available as hand-held or bolt-on device (e.g. SK PAR-5H, SK TU5-CTR)
• Using our NORDCON App and the NORDAC ACCESS BT Bluetooth Stick
• For some variable frequency drive models, an individual parameterization can be carried out via integrated DIP switches and potentiometer. You can find drive-specific information in the respective manual for your drive.

The SK 135E/175E series has an integrated RS232 interface. To use a hand-held ParameterBox, use a RS232/RS485 interface converter (SK TIE4-RS485-RS232, 275274603)

• As a general rule, a NORD variable frequency drive can process a 0/4–20 mA or bipolar analog signal
• This can be set in the parameters P400–P403 (input) and P418–P419 (output), and is described in the operating instructions of the variable frequency drive
• You have to set an adjustment of the analog input/analog output
• For some variable frequency drive models, you have to adjust a DIP switch for the V/I conversion (internal resistance of the analogue input/analogue output)
• For some variable frequency drive models, an external converter (V/I converter 10 V 20 mA, 278910315) must be connected to the analogue output
• For the connection of a bipolar analog signal to the unipolar analog input of a variable frequency drive, an external setpoint converter +/10 V (278910320) can be connected

• The ParameterBox was used as display of the internal PLC of the frequency inverter
• The variable frequency drive's PLC program may be faulty, or the PLC parameters may have been changed
• The display mode of ParameterBox P1003 was set to "PLC display". If you do not want this, you can reset it to default.

In parameter P535, you'll find that the motor temperature is calculated depending on the output current, the time, and the output frequency (cooling). This may provide additional protection to the motor.

The device must be regularly connected to the supply network (approx. once a year) for at least 60 minutes. If the storage period of one year is exceeded, please look up the respective measures in chapter "Long-term storage" in the operating instructions of your respective variable frequency drive.

There are various migration guides that can be used for transcoding (e.g.MI0500).

• Access our field bus manuals in our documentation center
• Find How-To videos on the topic of integration into BUS systems on YouTube
• Find various field bus files and standard modules for system integration on NORD's website

The required parameters to be set depend on the application. The following is just a minimum example.

• Acceleration and deceleration times (P102/P103)
• Set minimum and maximum frequency (P104/P105). In case of too low speeds, the motor’s self-cooling (e.g. < 25 Hz) may not suffice.
• Set the motor data according to the motor name plate P201–P206
• Star Delta con. P207
• Automatic stator resistance calibration (P208) into P220 [=1] after entering all previous parameters, and with cold motor (approx. 15–25 °C)
• Parametrize control inputs P4xx
  
  • e.g. enable via digital input
  • e.g. setpoint via analogue input

Use the following as an example

• Acceleration and deceleration times (P102/P103). Select a long deceleration ramp as necessary.
• Set minimum and maximum frequency (P104/P105). In case of too low speeds, the motor’s self-cooling (e.g. < 25 Hz) may not suffice.
• Select the disconnection mode P108 "Voltage disable [=0]" to switch off the output signal without delay
• Set the motor data according to the motor name plate P201–P206
• Star Delta con. P207
• Automatic stator resistance calibration (P208) into P220 [=1] after entering all previous parameters, and with cold motor (approx. 15–25 °C)
• Set P211 and P212 to 0% to set a linear V/f characteristic curve
• Parameterize control inputs P4xx
• The flying start P520 [=1] is required to connect the FI to already rotating motors
• Use parameter P540 to avoid an unwanted rotation direction of the variable frequency drive

• If the device isn't visible (error message: No device found) when you establish a connection, activate the location detection
• If your device continues to fail, delete your pairing list by holding both buttons for around 5 seconds and release them
• If uploading to your device doesn't work, check the LOCK sliding switch to ensure it's in the correct position
• Ensure the parameter file on the stick has the explicit name "Dataset.ndbx"

Get in touch with us via our service form or by phone.