Delta Electronics VFD-EL manual 08.08, 08.09, 08.10, 08.11, 08.12, 08.13, 08.14

Chapter 4 Parameters

When momentary power loss is detected, the AC motor drive will block its output and then wait for a specified period of time (determined by Pr.08.07, called Base-Block Time) before resuming operation. This parameter should be set at a value to ensure that any residual regeneration voltage from the motor on the output has disappeared before the drive is activated again.

This parameter also determines the waiting time before resuming operation after External Baseblock and Auto Restart after Fault (Pr.08.15).

08.08	Current Limit for Speed Search		Unit: 1
	Settings	30 to 200%	Factory Setting: 150

Following a momentary power loss, the AC motor drive will start its speed search operation only if the output current is greater than the value set by Pr.08.08. When the output current is less than the value of Pr.08.08, the AC motor drive output frequency is at “speed synchronization point”. The drive will start to accelerate or decelerate back to the operating frequency at which it was running prior to the power loss.

				Maximum Allowable
Power				Power Loss Time
		08.05
Input
						Speed
					Speed Search	Synchronization
						Detection
	08.04=1
Output			Baseblock Time
Frequency					08.06
Output
Voltage

Maximum

08.05Allowable Power

08.04=2 Baseblock Time

08.06

08.09	Skip Frequency 1 Upper Limit		Unit: 0.01
08.10	Skip Frequency 1 Lower Limit		Unit: 0.01
08.11	Skip Frequency 2 Upper Limit		Unit: 0.01
08.12	Skip Frequency 2 Lower Limit		Unit: 0.01
08.13	Skip Frequency 3 Upper Limit		Unit: 0.01
08.14	Skip Frequency 3 Lower Limit		Unit: 0.01
	Settings	0.00 to 600.0Hz	Factory Setting: 0.00

4-80 Revision August 2008, 2ELE, V1.02