Delta Electronics VFD-S manual A-05, A-06, A-07, A-08

Chapter 5 ParametersVFD-S Series

When this parameter is set to gain =1, PID output is Derivative time. At this time, error value – error value of the preceding item= additional respond speed and it is easy to have over compensation situation.

A-05	Upper Bound for Integral Control		Unit: 1
	Settings	d0 to d100%	Factory Setting: d100

This parameter determines the Upper Bound for Integral Control while operating in the PID feedback loop. (Limit = 1-00×A-05 %). During a fast Integration response, it is possible for the frequency to spike beyond a reasonable point. This parameter will limit this frequency spike.

A-06		Primary Delay Filter Time		Unit: 2 msec
		Settings	d0 to d999	Factory Setting: d0
Primary Delay Filter Time will slow down oscillation of the system.
	A setting of d0 disables this function.
A-07		PID Output Frequency Limit		Unit: 1
		Settings	d0 to d110%	Factory Setting: d100

This parameter determines the limit of the PID output frequency. If this parameter is set to 110%, then the maximum output frequency while in the PID operation will be (110% x Pr.01- 00) 66Hz.

A-08	Feedback Signal Detection Time		Unit: 0.1
	Settings	d0.0 to d650 seconds	Factory Setting: d0.0

This parameter defines the detection time for the loss of a feedback analog signal. The drive will follow the operating procedure programmed in Pr.A-09 if the feedback signal is lost for more than the time set in Pr. A-08.

A setting of 0.0 disables this function.

A-09Treatment of the Erroneous Feedback Signals

		Factory Setting: d0
Settings	d0	Warning and RAMP to stop
	d1	Warning and COAST to stop

5-76 Revision August 2008, SE09, SW V2.61