Delta Electronics VFD007S23A manual Maximum Allowable Power Power Loss Time

Chapter 5 ParametersVFD-S Series

Following a power failure, the AC drive will start its speed search operation, only if the output current is greater than the value determined by Pr.8-07. When the output current is less than that of Pr.8-07, the AC drive output frequency is at a “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 failure.

			Maximum Allowable
Power			Power Loss Time
	08-05
Input					Speed
				Speed Search	Synchronization
		08-04=d1			Detection
Output		Speed search starts
Frequency		with the Master
		Frequency
Output
			08-06
Voltage		Baseblock Time

	Maximum
08-05	Allowable Power

08-04=d2

Speed search starts with

Min. Output Frequency

08-06

Baseblock Time

8-08Skip Frequency 1 Upper Limit			Unit: 0.1
8-09Skip Frequency 1 Lower Limit			Unit: 0.1
8-10	Skip Frequency 2 Upper Limit		Unit: 0.1
8-11	Skip Frequency 2 Lower Limit		Unit: 0.1
8-12	Skip Frequency 3 Upper Limit		Unit: 0.1
8-13	Skip Frequency 3 Lower Limit		Unit: 0.1
	Settings	d0.0 to d400Hz	Factory Setting: d0.0

These parameters determine Skip frequency. It will cause the AC drive to skip operation at these frequency ranges with continuous frequency output.

Pr.8-9, Pr.8-11, Pr.8-13 are for Lower Bound setting, and the settings should follow as Pr.8-9 ≧Pr.8-11≧Pr.8-13.

8-14Auto Restart After Fault		Unit: 1
Settings	d0 to d10	Factory Setting: d0

After fault occurs (allowable faults: over-current OC, over-voltage OV), the AC drive can be reset/restarted automatically up to 10 times. Setting this parameter to 0 will disable the reset/restart operation after any fault has occurred. When enabled, the AC drive will restart with speed search, which starts at the Master Frequency.

5-60 Revision August 2006, SE08, SW V2.61