Danfoss VLT 5000 Fault codes 4
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Motor runs unevenly:
- Check if the VFD settings are correct. Adjust motor data settings if needed.
- If adjusting settings doesn't help, contact Danfoss for support.
Motor does not run:
- Check the display for a backlight. If there's a backlight, look for any fault messages and refer to the Warnings section.
- If there's no backlight, ensure the VFD is connected to the power supply If it is, proceed to the next step.
Motor does not brake:
- Refer to the manual for instructions on controlling the brake function.
No message or backlight in display:
- Check if the pre-fuses for the VFD have blown. If they have, contact Danfoss.
- If the fuses are okay, check for an overloaded control card. Disconnect control signal plugs and see if the fault disappears.
Motor stopped, light in display, but no fault report:
- Try starting the VFD by pressing the [START] button.
- If the display is frozen, check cable connections. Ensure the motor is connected and all phases are okay.
- Set the VFD for local operation and adjust the reference value. Check if the motor runs. If not, contact Danfoss
The Danfoss VLT 5000 series VFD offers three built-in controllers for different types of control: speed control, process control, and torque control. Here's a summary of each controller and their settings:
Speed and Process Control (PID Controllers):
Feedback Signal: Set a feedback range for both controllers in the units relevant to the application (Hz, RPM, bar, °C, etc.). This range limits the possible reference range.
Reference: Four preset references can be set between -100% and +100% of the maximum reference or the sum of the external references. External references can be analog signals, pulse signals, and/or serial communication.
Speed Control: Optimized for maintaining a given motor speed. Specific parameters for speed control are 417 to 421.
Process Control: Optimized for process control applications. It offers options for normal or inverse control, integration continuation at limit conditions, and programming a starting frequency. Specific parameters for process control are 437 to 444.
Torque Control (PI Controller):
Control Mode: Selected if "Torque control, open loop" is chosen in parameter 100 (Configuration).
Reference Unit: Uses the Nm unit for reference.
Control: It's a PI control that does not require feedback, as torque is calculated based on the current measurement of the VLT 5000. The proportional gain is set as a percentage in parameter 433 (Torque proportional gain), and the integration time is set in parameter 434 (Torque integration time). These are usually set at the factory and normally require no modification.
Each controller type has its specific parameters and settings that can be adjusted according to the application's requirements. It's important to select the appropriate controller type and configure the settings correctly to ensure optimal performance of the VFD in the desired application.
Local and Remote Control:
The Danfoss VLT 5000 series VFD can be operated manually or remotely. Here are the functions/commands available via the control panel, digital inputs, or serial communication port in both modes:
Local Control:
If parameter 002 is set to Local [1]:
On the LCP (Local Control Panel), the following keys can be used for local control:
- [STOP]: Parameter 014 [1] Enable
- [JOG]: Parameter 015 [1] Enable
- [RESET]: Parameter 017 [1] Enable
- [FWD/REV]: Parameter 016 [1] Enable
Set parameter 013 for LCP control and open loop [1] or LCP control as parameter 100 [3]:
- Local reference is set in parameter 003; can be changed via the "+/-" keys.
- Reversing can be effected by means of the [FWD/REV] key.
Set parameter 013 for LCP digital control and open loop [2] or LCP digital control as parameter 100 [4]:
- Digital inputs can be used for control functions such as reset, stop inverse, setup choice, ramp 2, quick-stop, DC braking, reset and motor coasting stop, motor coasting stop, reversing, and speed up/down.
Remote Control:
If parameter 002 is set to Remote control [0]:
[STOP]: Parameter 014 [1]
[JOG]: Parameter 015 [1]
[RESET]: Parameter 017 [1]
Control with Brake Function:
The function of the brake is to limit the voltage in the intermediate circuit when the motor is acting as a generator. This occurs, for example, when the load drives the motor, and the power enters the intermediate circuit. The brake is built up in the form of a chopper circuit with the connection of an external brake resistor. Placing the brake resistor externally offers several advantages, such as selecting the brake resistor based on the application, dissipating the brake energy outside the control panel, and preventing overheating of the VFD's electronics if the brake resistor is overloaded.
The brake is protected against short-circuiting of the brake resistor, and the brake transistor is monitored to ensure that short-circuiting of the transistor is detected. A relay/digital output can be used for protecting the brake resistor against overloading in connection with a fault in the VFD.
Additionally, the brake allows for reading out the momentary power and the mean power for the latest 120 seconds, as well as monitoring that the power energizing does not exceed a monitoring limit selected via parameter 402. In parameter 403, select the function to be carried out when the power transmitted to the brake resistor exceeds the limit set in parameter 402.
Note: Monitoring of the brake power is not a safety function; a thermal switch is required for that purpose. The brake resistor circuit is not earth leakage protected.
Selection of Brake Resistor:
To select the right brake resistor, information on how often to brake and the level of power braking is needed. The resistor ED is an indication of the duty cycle at which the resistor is working. The ED is calculated as follows:
ED (duty cycle) = tb / T cycle
where tb is the braking time in seconds and T cycle is the total cycle time.
The maximum permissible load on the brake resistor is stated as a peak power at a given ED. The peak power can be calculated based on the highest brake resistance required for braking:
P_PEAK = P_MOTOR x M_BR(%) x η_MOTOR x η_VLT [W]
where M_BR(%) is a percentage of the rated torque.
The brake resistance is calculated as follows:
R_REC = U_DC^2 / P_PEAK [Ω]
where U_DC is the intermediate circuit voltage. The brake will be active at specific voltages depending on the VFD model.
Note: The brake resistor used must be rated to the appropriate voltage (430 Volts, 850 Volts, 960 Volts, or 1100 Volts), unless Danfoss brake resistors are used. R_REC is the resistance recommended by Danfoss, guaranteeing that the VFD can brake at the highest braking torque (M_br) of 160%. The typical values for η_motor and η_VLT are 0.90 and 0.98, respectively.
+ Danfoss VLT 5000 user manual
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