Quick Start Guide for INVT GD20-EU Series Variable Frequency Drive (VFD)

Quick Start Guide for INVT GD20-EU Variable Frequency Drive (VFD)

The equipment manual is the only reference document for all safety standards. Only qualified personnel may operate the Variable Frequency Drive (VFD).

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Below is a quick guide for installation; all operations can be performed from the keyboard, but it is always recommended to use the INVT Studio software.

All configurations described in this article refer to a default state of the Variable Frequency Drive (VFD).

As the first operation, set all the Variable Frequency Drive (VFD) parameters to default, set P00.18=1

Motor Autotuning

After connecting all components: network filter, motor, braking resistor by connecting the Variable Frequency Drive (VFD) to the network, the first thing we need to do is set the motor parameters. There are 2 autotuning procedures: dynamic to be performed with the motor decoupled from the load, static executable with the motor coupled to the load; if possible, it is preferable to carry out the dynamic procedure.
 

• Define motor parameters: Power P02.01, Nominal frequency P02.02, Rotation speed P02.03, Voltage P02.04, Current P02.05. All other parameters are automatically calculated by the autotuning procedure.
• Enable keyboard commands P00.01=0. This activates the Variable Frequency Drive (VFD) keyboard.
• Activate autotuning P00.15.
  0: No operation
  1: Complete dynamic autotune of motor parameters. It is advisable to use it when high control accuracy is necessary and the motor can be physically separated from the load.
  2: Complete static autotune of motor parameters. Use when the motor cannot be separated from the load.
  3: Partial static autotuning of motor parameters. Tuning only for parameters P02.06, P02.07, P02.08
• Activating autotuning will cause the text -run- to blink on the display; by acting on the [RUN] command, the procedure will be performed (If you have chosen the dynamic procedure, the motor will begin to rotate), and a progressive number will appear on the display after the text -run-x. Once the procedure is complete, the Variable Frequency Drive (VFD) will stop.

Motor Thermal Protection Calibration

P02.27: This is a value (K) in percentage that allows you to set the alarm triggering time for thermal protection. It is calculated with the formula:

K=[(LOut/Lm)/M]*100

K: Calculated value to be set in P02.27
M: Overload time calculation constant (See graph in the manual, 60 Min=116, 12 Min=150, 5 Min=180, 1 Min=200)
LOut: Nominal output current of Variable Frequency Drive (VFD) (A)
Lm: Nominal motor current (A)

Example: GD20 2.2 kW  5.5A and motor 1.5kW 4A
LOut=5.5A; Ln=4A

If we want the triggering after 5 minutes -> K=[(5.5/4)/180]*10000 -> 76.38 -> Set 76
If we want the triggering after 1 minute -> K=[(5.5/4)/200]*10000 ->68.75 -> Set 68

Command via Modbus

To manage the Variable Frequency Drive (VFD) with SlimLine systems using the function block InvtGD20EU, you need to:

• Set the Modbus address as defined in the FB, P14.00=xxx.
• Set communication parameters as defined in the program, P14.01=x, P14.02=x.
• Set control from serial communication (LED LOCALREMOT on the keypad lit), P00.01=2.
• Select frequency command A with setting from Modbus P00.06=8.
• Select frequency command A as speed source P00.09=0.

Common Configurations

By properly configuring the various parameters of the Variable Frequency Drive (VFD), many usage configurations can be obtained; below we list the most commonly used configurations.

3-Wire Control with Speed from External Potentiometer
Three digital inputs are used for motor control from buttons, S1 (no) for forward rotation, S2 (no) for reverse rotation, S3 (nc) for stop, and the rotation speed is settable from a potentiometer on input AI2. To configure this operating mode, you need to:

• Enable control from digital inputs, P00.01=1.
• Enable forward rotation command from input S1, P05.01=1.
• Enable reverse rotation command from input S2, P05.02=2.
• Enable multi-step speed selection 1 from input S3, P05.03=3.
• Select frequency command A from input AI2 P00.06=2.
• Select frequency command A as speed source P00.09=0
• Select control mode from 3-wire inputs P05.13=3.

Command from Digital Inputs with Step+ and Step- Motor Speed Inputs
Four digital inputs are used for the command, S1 (no) for forward rotation, S2 (no) for reverse rotation, S3 (no) for Step+ speed, S4 (no) for Step- speed.

• Enable control from digital inputs, P00.01=1.
• Enable forward rotation command from input S1, P05.01=1.
• Enable reverse rotation command from input S2, P05.02=2.
• Enable frequency setting from the keyboard P00.06=0. Set start frequency on rotation commands, P00.10.
• Enable frequency increment command (Step+) from input S3, P05.03=10. Set variation coefficient, P08.45.
• Enable frequency decrement command (Step-) from input S4, P05.04=11. Set variation coefficient, P08.46.
• If you want to define a frequency variation range, set minimum P00.05 and maximum P00.03.

Rotation Command from Digital Inputs with Multi-step Speed
In this operating mode, it is possible to control clockwise/counterclockwise rotation via the 4 digital inputs with the possibility of 4 different speeds (Selectable by the combination of inputs S3/S4). To configure this operating mode, you need to:

• Enable control from digital inputs, P00.01=1.
• Enable forward rotation command from input S1, P05.01=1.
• Enable reverse rotation command from input S2, P05.02=2.
• Enable multi-step speed selection 1 from input S3, P05.03=16.
• Enable multi-step speed selection 2 from input S4, P05.04=17.
• Select frequency command A with multi-step speed P00.06=6.
• Select frequency command A as speed source P00.09=0.
• Setting of the 4 multi-step speeds: 0 (S3=Off, S4=Off) P10.02, 1 (S3=On, S4=Off) P10.04, 2 (S3=Off, S4=On) P10.06, 3 (S3=On, S4=On) P10.08. The set values indicate the percentage speed relative to the maximum output frequency P00.03.

Manual or Automatic Command with Sensor Feedback
In this operating mode, the control of a pump is executed; via a digital input, it is possible to select 2 operating modes:

Manual, the rotation speed is defined by the potentiometer on the keypad.
Automatic with Sensor Feedback, the potentiometer on the keypad sets the flow set point, which is feedback-controlled by a pressure gauge.

• Set speed control in V/F, P00.00=0.
• Enable control from digital inputs, P00.01=1.
• Enable PID (Control A), P00.06=7.
• Select PID feedback input, P09.02=1 (1:Analog input AI2).
• Select PID control set point (Control A), P09.00=1 (1:Potentiometer on keypad AI1).
• Select speed setting (Control B), P00.07=1 (1:Potentiometer on keypad AI1).
• Enable forward rotation command from input S1, P05.01=1.
• Enable switching between control A and B from input S2, P05.02=13.