Delta Electronics VFD-EL manual Low Voltage Lv

Chapter 5 Troubleshooting

5.4 Low Voltage (Lv)

Low voltage

Is input power correct? O r power cut, Yes
including momentary power loss									Restart after reset
	No
Check if there i s any malfunction		Yes
						Change defectiv e component
component or disconnection i n						and chec k c onnection
power s upply c ircuit
	No
Check if voltage is			No				Make nec essary corrections,
							such as change power supply
within speci fic ati on
							sy stem for requirement
	Yes
Check if there i s heavy load				Yes
with high s tart current in the
same power sy stem
	No
											No
Check if Lv occurs when		Yes
									Suitable power
breaker and magnetic
									transformer capacity
contactor is O N
	No									Yes
Check if voltage between +/B1					No
and - is greater than								Maybe AC motor drive has m al function.
200VDC (for 115V/230V models)								Please contact DELTA.
400VDC (for 460V models)
	Yes

Control c ircuit has malfunction or misoperation due to noise. P leas e contact DELTA.

Revision August 2008, 2ELE, V1.02 5-3