What can cause a DC Bus Overvoltage fault?
Possible causes:
- The Input voltage is too high.
- Improper floating ground or high input voltage on one of the phases.
- There are power spikes or surges at the input.
- The drive is going into regeneration (regen).
- Rapid load change is causing a large spike in the DC Bus.
What causes VFD overvoltage?
During normal operation, VFDs may be exposed to transient overvoltage due to capacitor switching, utility equipment switching or lightning. Any transient voltage experienced on the input conductors to an AC voltage source drive, will be transferred as an impulse onto the DC bus.
What causes overvoltage on a motor?
Overvoltage occurs when the supply voltage rises above the rated voltage of the equipment or motor. Overvoltage can be caused by poor regulation of a power source from a utility company, oversized transformers, uneven or varying circuit loading, wiring errors, and electrical insulation or isolation failures.
How do you fix overvoltage?
POSSIBLE FIXES:
- Turn the overvoltage controller is on.
- Check supply voltage for constant or transient high voltage.
- Check the operation of brake chopper and resistor.
- Increase deceleration time.
- Use the “coast to stop” function whenever possible.
- Fit frequency converter with brake chopper and brake resistor.
What do you mean by overvoltage?
1 : the excess potential required for the discharge of an ion at an electrode over and above the equilibrium potential of the electrode. 2 : voltage in excess of the normal operating voltage of a device or circuit.
Why bus voltage is too high?
This Error occurs when the internal bus voltage exceeds its expected limits. This can be caused by several causes, one of them is that both the solar and battery module are trying to create/maintain the internal bus voltage, causing the voltage to rise rapidly.
How does overvoltage work?
Over voltage protection is a power supply feature which shuts down the supply, or clamps the output, when the voltage exceeds a preset level. Most power supplies use an over-voltage protection circuit to prevent damage to the electronic components.
What is bus voltage?
In power engineering, a “bus” is any graph node of the single-line diagram at which voltage, current, power flow, or other quantities are to be evaluated. This may correspond to the physical busbars in substation.
What is inverter bus voltage?
The operating range of the dc-bus voltage is 380±20 V. When the inverter is operated in grid-connection mode (selling power), the operating range is from 380 to 400V, which ensures an enough voltage level to accommodate abrupt dc load increase.
