abc PU00, Руководство пользователя

Страница: 40 / 95

38
EN
In the figure above, DI terminals FWD and REV are set in two-wire system, and the function of
DI1-DI4 is set as multi speed set selection. The speed set is calculated according to the selected preset
value in % by the states of 4 DIs, e.g., if state DI1~DI4 is 1111, then the 16th value preset in parameter
P0-45 is selected. The speed set is the product of the selected preset value time P0-16. Please be noted
that, maximal 4 DIs used for selecting the preset value. Less than 4 DI can also be used to select preset
value. In this case, the state of the missing terminal can be treated as 0.
5.3. Application of Process PID Control
Process PID control is used to control a target, e.g., temperature, pressure etc., with close loop
function by controlling the error between the set value and feedback value. It only works in remote
mode.

Set parameter P0-11=21 (main speed set source is assigned to process PID) to enable the
process PID control

Select the process PID feedback source by parameter P4-00 (default is invalid). For example, if
the process PID feedback source is terminal AI1, then P4-00 is set to 1. P3-00 can be used to
define the signal on AI1 as voltage or current input

Select the set value source of the process PID by parameter P4-01 (default is invalid). For
example, if P4-01 = 11, the PID control set value source is assigned to DI terminal selected
preset value.

Select close loop control logic by parameter P4-04, positive or negative according to the
application demands. The default set is positive close loop.

P4-07 he P4-08 can be used to adjust the control response of the PID process, P4-07 for
proportional gain and P4-08 for integration time.

A simple example of wiring for Process PID control is shown as below. In this set up, the AI1 is
the feedback.