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What are the alarm and fault temperature thresholds for the power units of the GD5000 product? What are the over-temperature alarm and fault thresholds for the phase-shifting transformer? 

1. Power unit: Alarm at 75°C or higher; trip at 85°C or higher; 

2. Phase-shifting transformer: Factory default is an alarm at 90°C or higher; we have observed a trip at 110°C. These values can be configured in P23.05 and P23.06.

 Cause analysis:
1. The encoder is not connected, or the encoder connector is loose.
2. One of the encoder signal wires (U, V, W, A, B, Z phases) is broken.
3. Encoder A/B phase signals are reversed.
4. Communication interruption or data abnormality caused mainly by noise interference.
Troubleshooting measures:
1. Check whether the encoder wiring is correct and whether the connector is firmly plugged in.
2. Verify that the encoder supply voltage is normal.
3. For incremental encoders, manually rotate the motor and observe parameter R2.50 (encoder Hall UVW value). Under normal conditions, the value should cycle between 1 and 6. If it shows 0 or 7, a broken wire is indicated.
4. Reduce interference on the encoder cable by routing the encoder cable separately from the motor power cable, and connect the encoder shield wire to the drive's FG terminal at one end only.

How to handle the situation where the air conditioner screen has backlight but shows a black display?
Troubleshooting steps:
1-Connect a computer to the screen's network port, and set the computer's IP address to the same subnet as the screen.
2-Open the command prompt on the computer and ping the screen's IP address. If you receive a reply, it means the main program is reachable; you can then proceed with upgrading the program.
3-If the ping fails, it indicates that the main program is frozen. In this case, flash (reprogram) the firmware directly. If the issue persists after flashing, the screen needs to be replaced.

If an overcurrent alarm occurs during acceleration or deceleration, which inverter parameters should be analysed, and what is the most effective solution?
A: You should check P00.11 (acceleration time) and P00.12 (deceleration time).
Overcurrent alarms during acceleration or deceleration are usually caused by acceleration or deceleration times being too short; therefore, you need to increase the acceleration time (P00.11) or the deceleration time (P00.12).

Disconnect the motor from the load and start the drive with no load.

1、If the drive runs normally → Mechanical fault. The issue is on the load side, such as a seized bearing, a stuck transmission mechanism, etc.

2、If the alarm still occurs → Electrical / drive fault. Further inspection is needed on the motor, cables, or the drive itself.

First, determine whether the issue lies with the module or the cabinet. You can try replacing the cabinet or the module to verify the problem: 
Cabinet issue
For cabinet issues, possible problems include damage to the monitoring board, cabinet signal lines, and aviation connectors. Conduct a thorough inspection and replacement of each component;
Module issues
Check if the indicator lights on the module are on. 
If the module lights are not on:
1. The auxiliary power source is faulty.
2. There is a problem with the power supply from the auxiliary power source. Check the input terminals and related cables.
If the module light is on but flickers:
1. The control board and signal lines are damaged. They need to be checked and replaced.

Q: The GD100-PV high-power machine reports faults in out1, out2, and out3.
A: First, use a multimeter to check if the unit module is faulty. If there is no fault, further disassemble the IGBT module inside the unit module to check for any burnout or short circuit marks. If there is no fault, check if the resistors R8 and R7 on the gate plate are damaged.

Analysis of Software or Hardware Overcurrent Causes and Countermeasures for GD5000 :  
Causes:  
1. Excessive acceleration rate  
2. Low grid voltage  
3. Insufficient power of the frequency conversion speed control system  
4. Sudden or abnormal load changes  
Countermeasures:  
1. Increase the acceleration time  
2. Check the input power supply  
3. Select a frequency conversion speed control system with one higher power rating  
4. Inspect the load or reduce sudden load variations

Q: Regarding the convertor mode setting, the customer successfully tested it in the lab, but the function failed when sent to the end customer for testing (frequency convertor operation did not occur). What could be the reason? (HTX31(11) 6-20KVA)

A: The reason is that the "FreqSelfAdpt" function in the MTR settings is not unchecked. If the input frequencies are inconsistent, frequency adaptation will automatically adjust the output frequency to 50/60Hz.