#154 - Commissioning a Danfoss FC302 Variable Frequency Drive

Danfoss FC302 variable frequency drives (VFD) can be used in a variety of applications, such as pumps, conveyors, agitators. They can be set-up in different control modes, such as speed, position, torque.

Here below some tips about the most important parameters to configure and change from default during commissioning for a typical speed and position control application via PROFINET:

        > 0-11 Edit Set-up: Select the set-up to be edited (that is programmed) during operation.  [1] Set-up 1.

        > 0-22 Display Line 1.3 Small: Select a variable for display in line 1, right position. [1607] Target Position (for position control).

        > 0-23 Display Line 2 Large: Select a variable for display in line 2. [1605] Main Actual Value [%] (for speed control).

        > 0-24 Display Line 3 Large: Select a variable for display in line 3. [1606] Actual Position (for position control).

        > 1-00 Select the application control principle to be used when a remote reference (that is via analog input or Fieldbus such as PROFINET) is active.
[0] Speed open loop (for speed control pump, conveyor).
[9] Positioning (for position control). Other options include [1] Speed CL for holding torque at 0RPM, [2] Torque, [3] Process for PID.

        > 1-01 Motor Control Principle Select which motor control principle to employ.

[3] Flux w/ motor feedback: High accuracy speed and torque control,

suitable for the most demanding applications. (for position control with encoder).

[2] Flux sensorless:Flux vector control without encoder feedback, for simple installation and robustness against sudden load changes.

Note: the default motor control mode is U/f.

        > 1-02 Flux Motor Feedback Source: the interface for which to receive feedback from the motor. [2] MCB 102, encoder module option.

From motor nameplate, enter the following parameters:         > 1-20 Motor Power [kW].         > 1-21 Motor Power [HP].         > 1-22 Motor Voltage.         > 1-23 Motor Frequency.         > 1-24 Motor Current.         > 1-25 Motor Nominal Speed.         > 1-39 Motor Number of poles.          (4 poles ~ 1500RPM, 2 poles ~ 3000RPM)

Carry-out a complete Automatic Motor Adaptation (AMA) for improved performance and more precise motor data, setting parameter 1-29 to [1]. The following parameters will be automatically updated:
        > 1-30 Stator Resistance (Rs).         > 1-31 Rotor Resistance (Rr).         > 1-33 Stator Leakage Reactance (X1).         > 1-34 Rotor Leakage Reactance (X2).         > 1-35 Main Reactance (Xh). Note: 1-36 Iron Loss Resistance (Rfe) has to be entered manually, looking at motor datasheet. Notes AMA: Run AMA on stopped, no-torque and cold motor, without filter between VFD and motor, after nameplate parameters have been inserted (otherwise the results return to default). Avoid having a motor that is more than one size down the VFD size.

        > 1-53 Model Shift Frequency (Hz): Enter the frequency value for shift between 2 models for determining motor speed.

      > 1-67 Load Type: [0] Passive (conveyor, fan, pump) [1] Active (hoisting, ramp up at 0 RPM)

        > 1-72 Start Function during start delay: [5] VVC+/ Flux clock-wise

        > 1-74 Start Speed [RPM]: e.g. 50 RPM for start speed in applications like hoisting.

        > 1-76 Start Current [A]: Full Amps on start for boosting start-up, it can be used for hoisting.

        > 1-90 Motor Thermal Protection: [2] Thermistor Trip when a thermistor or KTY sensor in the motor is connected to a ANA_IN of the VFD.

        > 1-93 Thermistor resource: [1] Analog Input on terminal 53 or 54, when there is a wired between 10V supply (terminal 50), the PTC/Thermistor and the analog input.

        Brake:         > 2-10 Brake Function: [0] Off [1] Brake resistor [2] AC Brake: improves braking when no brake resistor available.

        > 2-11 Brake Resistor Ohm

        > 2-20 Release Brake Current: Enter the motor current to release the mechanical brake. Check that the 2-20 is less than 1-76, e.g. 2.5 A and 3.5 A, so the motor builds enough starting current and the brake releases before the movement.

        > 2-23 Active Brake Delay: 0.5s for position control, 1s for speed control. Delay of brake activation after motor ramp down.

        References and Ramps:         > 3-06 Minimum Position: e.g. -1000mm for linear position control

        > 3-07 Minimum Position: e.g. 1500mm for linear position control

        > 3-15 Reference Resource: [0] Disabled (for Profinet)

        > 3-16 Reference Resource: [0] Disabled (for Profinet)

        > 3-41 Ramp Up Time: e.g. 1s for position/speed control, 10s for pump

        > 3-42 Ramp Down Time: e.g. 0.5s for position/speed control, 5s for pump

        > 4-10 Motor Speed Direction: [0] Clock-wise [2] Both directions

        > 4-13 Motor Speed High Limit [RPM]: e.g. 1500 RPM

        > 4-43 Motor Speed Monitor Function: [12] Trip/Warning

        > 4-53 Warning Speed High [RPM]: e.g. P4-13

        > 4-58 Missing Motor Phase: [1] Trip 100ms

        > 4-91, 4-93 Positive Speed Limit [RPM]: e.g. P4-13

To be continued...

Links:

> Overview Danfoss files

> Danfoss Programming Guide (parameters list)