ECKELMANN VS 300 - Determining the Setpoint for Speed Control

Function of VS 300
50
Doku-Version 2.05 - Firmware 2.10 - 15. September 2017
‐ Minimum speed of speed adjuster in continuous control
‐ Analog output adjusting differential/control speed
‐ Maximum temperature in speed control
These parameters are only displayed when speed or combined control is activated as the control type
(see section 7 Parameter List and Menu Structure – Common Setpoints for System Configuration).
Minimum speed of the speed adjuster can be set with the Minimum Speed parameter. Entry is made in percent
for the 0-10 V analog output of the VS 300. Controller speed can be influenced with the Analog Output Control
Speed parameter. If the controller is too slow, the parameter must be set higher. If hunting occurs, the parame
ter should be set lower.
One or two relay/control stages can be allocated to a speed controller. If only one stage is allocated to the
speed controller, it is used for enabling/disabling of the speed adjuster. When two stages are allocated to the
controller, the first is used for enabling/disabling the speed adjuster and the second for actuating a bypass for
the speed adjuster. The connected fan then runs at constant speed, bypassing the speed adjuster.
If the limit set as maximum temperature with speed control is exceeded and a second relay/control stage is allo
cated to the speed controller, this second stage (bypass) is activated and the first stage disabled (enable speed
adjuster).
On attaining the defined setpoint for t
c
, the controller returns to control mode (bypass off, speed adjuster enable
on).
When a bypass stage is programmed, it must actually be connected, as enabling of the speed ad
juster is disabled at high temperature!
4.5.6 Determining the setpoint for speed control
Calculation of the setpoint for t
c
is made as described in section 4.5.4 Control Algorithm with Step Controller.
Additionally a speed setpoint is determined. The following relationship applies for calculation:
U
Setp
 P
Action

U
Setp
= Speed adjuster setpoint (0-10 V)
P
Action
= Proportional action of controller
I
Action
= Integral action of controller
P
Action
 t
c_Act

t
c_Act
= Current value of t
c
t
c_Setp
= Setpoint for t
c