Burkert Type 8620 - Manual (Page 126)

mxCONTROL Type 8620
Page 126
Output Override
The output of this module is influenced at certain states (see figure).
Automatic
Manual
Operation
mode
Manual
Output
Value
0
1
Sensor-/Input
fault
Safety
Output
Value
Module
Output
CMD
0
1
System
Switch
0 %
0
1
Flow
Switch
0 %
Output from
PI-Controller
System Switch
override function
can be enabled
or disabled Flow Switch
override function
can be enabled
or disabled
0
1
0 %
Maximum
Output
Timer is
expired
Optional,
if configured
Figure 65: Output override (CL_ORP)
Maximum Output Timer (MOT)
This function monitors controller output of the chlorine/redox controller in automatic Mode. If the
controller output emits the maximum control output longer than the defined maximum control output
time (+Tm), then the controller output will be overridden with "0 %".
In this case an alarm “Out fails” is generated and the common alarm relay is actuated, too.
The internal timer counting the period of the maximum control output will be reset if the control output
is smaller than the maximum control output and the alarm has not yet been triggered. The maximum
output is determined by the parameter "Upper output limit Lim+".
The Maximum Output Timercan be enabled/disabled through the configuration. For a general
description of the MOT refer to chapter 14.1.5.
The chlorine/redox controller output will be overridden with 0 % until the operator
acknowledges the alarm message with the soft key buttons in the process data menu,
even if operation mode was changed.