How to solve the problem of large 100A fluctuation in the output current at the fan application site of the GD5000 inverter
A: 1. Verify whether the VFD parameters are set correctly, confirm if the motor has undergone self-learning, and check the working conditions at the customer site;
2. Observe the operating data of the motor and load before and after decoupling, and confirm whether the problem is a mechanical issue on the load side or an electrical issue on the equipment side based on the observed phenomena.
3. If the no-load output is stable but regular current fluctuations occur when loaded, it is most likely a mechanical fault on the load side. It is recommended that the customer perform dynamic balance correction, and check the alignment accuracy of the coupling, bearing clearance, etc.
When the P00.09 frequency source configuration is set to B (frequency source setting), i.e., P00.09 = 1, and the P43 group sleep function is used, the system cannot enter sleep mode even when the frequency falls below the sleep threshold.
A: When using the P43 group sleep function, P00.09 must be forcibly set to 0 by default, i.e., A (frequency source setting).
1. Set the operation mode to power balance mode, and use optical fiber communication between the two main units
2. Set the droop control to 1-2 Hz to achieve dynamic power balance
3. Appropriately adjust the current loop and speed loop of the P3 vector group to ensure stable current output
These series HT3360-500K，RM20-90K（PM10-15K）RM25-600K(PM30X)，RM25-200K(PM25C)，RM40-500K(PM50)，RM600/60D，RM600-1000K(PM100DFaults such as bus overvoltage, explosion, and output overload occur.
A: To check the "Scope" menu on the display, look at the output voltage and current waveforms. To zoom in on the current waveform, click "Zoom In" when it is displayed in Small mode.
The purpose is: to see the type of load, whether it is industrial control load, because industrial control load has energy feedback to the UPS, causing unstable operation.
The current solution is to install the BAU (discharge device
What is the difference between the STO function on GD series models equipped with STO and the coast to stop function of the S-terminal?
A: The results are the same; both STO and free stop will block the output, but STO will trigger a fault. STO is controlled by hardware circuitry, while coast to stop is controlled by software. STO offers greater safety and stability.
An emergency stop involves decelerating to a stop, but the deceleration time is based on P01.26 (Emergency Stop Time), which differs from P00.12 (Deceleration Stop Time) used for normal deceleration stops. The coast to stop immediately block the output, whereas a deceleration stop does not.
No. The AI/AO and expansion card PTC temperature measurement function of the GD350A is not Ex/ATEX certified.
The basic principle applies when the outlets of two fans share the same duct. If one fan spins significantly faster than the other, the resulting pressure difference drives the slower fan to accelerate until its speed matches that of the faster fan. At this point, the slower fan enters a generator mode, feeding energy back into the VFD and causing the VFD's DC bus voltage to rise. If the voltage reaches the over-voltage stall threshold, the VFD controlling the slower motor automatically increases its output frequency to match the actual rotational speed. Consequently, the fan exits generator mode and returns to motor mode; it stops generating power, and the VFD's DC bus voltage drops.
Troubleshooting for UPS Fault Code 65, Applicable Model: HT(R)X 01-20KVA S L
Q: The UPS displays fault code 65 and fails to start normally. According to the user manual, this fault indicates low battery voltage. How should we troubleshoot this issue?
A: When this series of UPS triggers fault code 65, the control logic will prevent normal startup. This fault is mainly caused by three factors: faulty UPS charger, damaged batteries, or abnormal battery voltage detection circuit.
Please follow the steps below to locate the root cause:
1.Check the actual battery voltage and confirm whether it matches the value displayed on the UPS screen, so as to determine whether the fault originates from the detection circuit on the power board.
1）If consistent:
Disconnect the two battery BUS cables connected to the UPS power board and restart the UPS. Next, measure the DC voltage at the battery BUS cable terminals on the power board to verify whether the measured voltage is roughly equal to the reading shown on the UPS screen and check if the UPS can start normally.
NOTES:
Make sure to discharge the capacitors at these terminals before disconnecting or reconnecting the battery BUS cables.
2）If inconsistent: The battery voltage detection circuit on the power board may be damaged, which requires replacement of the power board.
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