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dEU is the speed deviation fault. Set the speed and detect the speed deviation. After the detection time is exceeded, the inverter will stop reporting the dEU fault. The reason may be that the load is too heavy or the rotor is blocked, which causes the speed deviation to be too large. It is necessary to check the load condition, extend the speed deviation detection time, and adjust the speed loop PI parameters according to the control mode to increase the reduced output torque.

If the power indicator is on, the keypad does not display,  the possible causes of the failure:
1. The power supply of the driving power board is damaged or there is a short circuit;
2. The keypad wire is not in good contact or the keypad is burnt out;
3. The main control board is damaged;

If the power indicator is not on, the possible causes of the failure are as follows:
1. No input power;
2. The fuse is broken;
3. The rectifier bridge is broken.

Adjust V/f control parameters properly.
1. Slip compensation P04.09
2. Suppression of oscillation P04.10, P04.11, P04.12, P11.27 (VF oscillation suppression method selection, ones bit effective)
3. PWM selects the ones bit in P08.40

Possible causes of failure:
1. The short-circuit connection jumper between terminal 24 V and PW is lost;
2. The voltage of terminal 24 V is abnormal;
3. The terminal is damaged;
4. The terminal polarity is set incorrectly;
5. Some parameter setting is improper, please reset to factory parameters, then test.

GD350 needs to be equipped with a Bluetooth card, scan the QR code on the inverter, download and install INVT Workshop, and open the mobile phone Bluetooth to connect to the inverter. See the video link below for more steps.

https://www.youtube.com/watch?v=zkC-eGiBJ8I

GD300-01A is a dedicated inverter mainly developed for screw air compressors. For other types of air compressors, it is recommended that you consult our technicians to determine the specific control plan.

There are 3 parameters P22.24~P22.26 are used for setting the conditions of reduce motor:
1. P22.24 pressure allowance 100% is corresponding with P09.02.
2. If variable frequency motor runs frequency reach P22.20, and (PID feedback [P17.24] - PID given[17.23]) > Pressure allowance [P22.24]), this status keep time reach P22.26, meet condition of reduce motor.
3. P22.25 a limit frequency to reduce motor. When the system still have power freq. motor, and VFD output reach this P22.25, keep time reach P22.26, start to reduce the power freq. motor.
4. Also when added a power freq. motor, VFD also output this setting frequency P22.25, then adjust by PID, avoid pipe pressure fluctuation.
5. When reduce motor, VFD operate the relay to switch-off power freq. motor, at the same time, increase output frequency to P22.20 with P22.28 ACC time(if P22.27=1), then adjust output frequency by PID. In order to avoid pipe pressure fluctuation.

GD300-01A is single-VFD, only one variable frequency output, use to control the main motor of air compressor;
GD300-01A-RT is single-VFD integrated machine, one variable frequency output for main motor, and integrated one power frequency for cooling fan;
GD300-21 is dual-VFD integrated machine, two variable frequency outputs for main motor and cooling fan.

A: Possible causes of failure:
1. The input voltage is too low;
2. The phase detection board fails;
3. The main control board fails;
4. Wrong voltage setting in P29 or P02 groups.

Countermeasures:
1. Measure the input power supply to judge whether the power is off or the input voltage is too low;
2. Replace the input phase loss detection board and judge whether it is damaged.