Endress+Hauser Liquiline CA80SI - Page 85

Liquiline System CA80SI Operation
Endress+Hauser 85
Function = Controller
Function Options Info
Actuator type Selection
• None
• Unipolar(-)
• Unipolar(+)
Factory setting
None
Here you specify what part of the controller
should power the relay. Unipolar(+) is the part
of the manipulated variable which the controller
uses to increase the process value (e. g. for
heating purposes). On the other hand, select
Unipolar(-) if you want to connect an actuator
to the relay that causes the controlled variable to
drop (e. g. for cooling purposes).
Cycle duration
Operating mode = PWM
Shortest turn-on time to
999.0 s
Factory setting
10.0 s
‣
Specify the cycle duration within which the
duty cycle should be varied (only PWM).

The settings for Cycle duration and Shortest turn-on time mutually affect one another. The following
applies Cycle duration ≥ Shortest turn-on time.
Shortest turn-on time
Operating mode = PWM
0.3 s to Cycle duration
Factory setting
0.3 s
Pulses that are shorter than this limit value are
not output in order to conserve the actuator.
Maximum frequency
Operating mode = PFM
1 to 180 min
-1
Factory setting
60 min
‐1
Maximum number of pulses per minute
The controller calculates the pulse duration
based on this setting.
Outputting diagnostic messages via the relay
If a relay is defined as a diagnostic relay (Function = Diagnostics), it works in the "fail-
safe mode".
This means that the relay is always energized ("normally closed", n.c.) in the basic state if
an error is not present. In this way it can also indicate a drop in voltage, for example.
The alarm relay always works in the failsafe mode.
You can output two categories of diagnostic messages via the relay:
• Diagnostic messages from one of the 4 Namur classes
• Diagnostic messages which you have individually assigned to the relay output
A message is individually assigned to the relay output at 2 specific points in the menu:
• Menu/Setup/General settings/Extended setup/Diagnostics settings/Diag. behavior
(device-specific messages)
• Menu/Setup/Inputs/<Sensor>/Extended setup/Diagnostics settings/Diag. behavior
(sensor-specific messages)
Before being able to assign the relay output to a special message in Diag. behavior
you must first configure Outputs/Relay x:y or /Alarm relay/Function = Diagnostics .