Delta Electronics VFD-L Series Especificaciones descargar pdf (Pagina 83)

VFD-M Series

5-57

Pr. 119

Differential Time (D)

Factory Setting: 0.00

Settings 0.00 to 1.00 sec Unit: 0.01sec

 This parameter determines the damping effect for the PID feedback loop. If the

differential time is long, any oscillation will quickly subside. If the differential time is short,

the oscillation will subside slowly.

Pr. 120

Integration’s Upper Bound Frequency

Factory Setting: 100 %

Settings 00 to 100 %

 This parameter determines the integration’s upper frequency limit while operating in the

PID feedback loop. (Limit = Pr.03

×Pr.120). During a fast Integration response, it is

possible for the frequency to surpass a reasonable point. This parameter will help limit

this frequency spike.

Pr. 121

One-Time Delay

Factory Setting: 0.0

Settings 0.0 to 2.5 sec Unit: 0.1sec

0.0 disable

 PI Control: When controlled by P action only, deviations cannot be eliminated entirely.

To eliminate residual deviations, the P + I control is generally utilized. If PI is used, it

could eliminate the deviation caused by set-point changes and external interferences.

However, if the I-action is excessively powerful, it will delay the response to the variation.

The P-action could solely be used on a loading system that possesses integral

components.

 PD Control: when a deviation occurs, the system immediately generates some

operational load that is greater than the single load generated by the D-action in order to

restrain the increment of the deviation. If the deviation is small, the effectiveness of the

P-action decreases as well. In some cases, control systems include integral component

loads, which are controlled by the P action only, and sometimes, if the integral component

is functioning, the whole system will be vibrating. In such cases, a PD control could be

used to lower the P-action’s vibration and to stabilize the system. In other words, this

control is good for use if the loads have no braking functions over the process.



PID Control: Uses the I-action to eliminate the deviation and the D-action to restrain the

vibration, and combine with the P action to construct the PID control. The PID control

method normally determines a control process with no deviations, high accuracy and

very stable.

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Delta Electronics VFD-L Series Especificaciones Pagina 83