Endress+Hauser Liquiline System CA80HA, Operating Instructions Manual

Page: 112 / 214

Operation Liquiline System CA80HA
112 Hauser
Function = Controller
Function Options Info
Actuator type Selection
• None
• Unipolar(-)
• Un)
Factory setting
None
Here you specify what part of the controller
should power the relay.
Un) is the part
of the manipulated variable which the
controller uses to increase the process value
(e.g. for heating purposes). Alternatively, select
Unipolar(-) if you are connecting an actuator
to the relay that reduces the controlled variable
(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 influence 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.
Hold behavior Selection
• Freeze last value
• Fixed value
• Ignore
Factory setting
Ignore
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