ECKELMANN VS 3000 User Manual

Version 2.02 15.05.2007 Function of VS 3000
32
The parameters in Lines 2 to 4 will only be shown when speed controller has been set as the control type. The
Min. speed parameter can be used to specify minimum speed of the speed adjuster. This is entered as a per-
centage and refers to the 0 to 10 V analog output of the VS 3000 Pack Controller. The Adjust diff. parameter can
be used to influence controller speed.
If the controller is too slow, this value must be increased. If hunting of the controller occurs, the value should be
decreased. If the t
c
-max limit is exceeded, the second capacity stage of the c ontroller is activated and the first
capacity stage is disabled (enabling of speed adjuster). With the second capacity stage a bypass can be actu-
ated to switch the variable speed fan to fixed speed.
When the setpoint is attained, the controller returns to control mode. The bypass can be deactivated by setting
the t
c
-max parameter auf ---.
3.27.8 Calculating setpoint with continuous control
Calculation of the t
c
setpoint is made as described in Section 3.26.5 - Calculating Setpoint with Step Controller.
Additionally, a speed setpoint is calculated. The following relationship applies:
U
Setp
= P
Actionl
+ I
Action
U
Setp
= Speed adjuster setpoint (0 to 10 V)
P
Action
= Proportional action of controller
I
Action
= Integral action of controller
P
Actionl
= (t
c_Act
− t
c_Setp
)*P
Setp
t
c_Act
= Current value of t
c
t
c_Setp
=t
c
-Setpoint
P action is the controller’s direct response to control error. I action prevents persistent control error.
I
Action
= I
Actionl
+

t
c_Act
− t
c_Setp

* I
Setp
The I-part is updated at ”Interval I” (in seconds).
P
Value
= Definable proportional factor of PI controller (Menu 3-2-2-1)
I
Value
= Definable integral factor of PI controller (Menu 3-2 -2-1)
Interval I = Time interval for calculation of I
Action
(Menu 3-2-2-1)

ECKELMANN VS 3000 Specifications

General

Brand	ECKELMANN
Model	VS 3000
Category	Controller
Language	English