Evoqua WALLACE & TIERNAN MFC, Instruction Manual

Page: 95 / 268

MFC
Functions
4.
95
4.7 Control Parameters
Control parameters and setting values for determining the control
functions of a controller. Different parameters apply for each
controller type.
Please note
The control parameters are listed alphabetically.
Pulses max./min Meaning:
Maximum number of pulses
Explanation:
The pulses max./min parameter only applies to solenoid pumps.
This parameter is used to set the maximum number of pulses per
minute in accordance with the employed pump.
Setting range:
The pulses max./min parameter can be set at either 100 or 120
pulses.
Setpoint Specified value at which the control variable can be maintained by
the controller. The setting range corresponds to the respective
measuring range.
Tn Meaning:
Integral action time (I-element)
Display:
Minutes (min)
Explanation:
On the basis of the integral action time Tn, the dosing rate changes
constantly until the setpoint is reached. The higher the value of Tn,
the longer it takes until the controller increases the dosing rate.
Tn higher: Control response is slower
Tn lower: Control response is faster
Setting range:
The parameter Tn can be set from 0–100 min (Tn = 0 means that
the "I-element" is deactivated, i.e. a pure P-control response
applies). It may not be possible to reach the setpoint value.
T Sampling time T is the time after which a change controlvariable or
setpoint is responded to. This value must be adjusted in the case
of delayed feedback signals.