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VFD68 Variable Frequency Drives
63
Table 46: Stall Prevention (Overvoltage)
Operation
Panel
Indication
oL
Description
During deceleration, if the regenerative energy of the motor becomes excessive to exceed the
regenerative energy consumption capability, this function stops the decrease in frequency to prevent
overvoltage trip. As soon as the regenerative energy has reduced, deceleration resumes.
Check Point
Check for sudden speed reduction.
Corrective
Action
The deceleration time may change. Increase the deceleration time using Pr. 8.
Table 47: PU Stop
Operation
Panel
Indication
PS
Description
Stop with
of the PU is set in P. 75.
Check Point
Check for a stop made by pressing
of the operation panel.
Corrective
Action
Turn the start signal OFF and release with
.
Table 48: Electronic Thermal Relay Function Pre-Alarm
Operation
Panel
Indication
TH
Description
Appears if the cumulative value of the P. 9 reaches or exceeds 85% of the preset level. If it reaches
100% of the P. 9 setting, a motor overload trip (E. THM) occurs.
Check Point
•
Check for large load or sudden acceleration.
•
Is the P. 9 setting is appropriate?
Corrective
Action
•
Reduce the load and frequency of operation.
•
Set an appropriate value in P. 9.
Table 49: Undervoltage
Operation
Panel
Indication
UV
Description
If the power supply voltage of the VFD decreases, the control circuit will not perform normal
functions. In addition, the motor torque will be insufficient and/or heat generation may increase. To
prevent this, if the power supply voltage decreases below about 115 VAC (about 230 VAC for 400 V
class, about 58 VAC for 100 V class), this function stops the VFD output and displays
.
An alarm is reset when the voltage returns to normal.
Check Point
Check that the power supply voltage is normal.
Corrective
Action
Check the power supply system equipment, such as a power supply.