15
11. Alarms / Failures
11.1 Definition
11.1.1
Alarms
The actuator / electronic unit is exposed to critical conditions (e. g. high temperature) which currently
do not affect the actuator, the electronic unit, the process or persons. The actuator functions are still
available. Previous alarms are saved in the „Saved Alarms“ memory of the electronic unit. Use the con-
figuration software to display the current and saved alarms.
11.1.2
Failures
The actuator / electronic unit is exposed to critical conditions (e. g. setpoint monitoring signal) which
instantly might affect the actuator, the electronic unit, the process or persons. The actuator will be
switched off and the actuator functions are no longer available. Previous failures are saved in the
„Saved Failures“ memory of the electronic unit. Use the configuration software to display the current
and saved failures. Failure messages can not be reset as long as the reason for the failure exists.
11.2 Alarm scheme
Fig. 14:
transmitter
temperature
monitoring
ON
&
Alarm Signal
upper limit
lower limit
setpoint monitoring
monitoring
maintenance
lubricants / elastom.
motor / gearing
actuator
temperature
electronics
process contr.
ON
actuator
stop
safety pos.
last setpoint
(high / low)
(high / low)
behav. at crit.
temp.
MAN
AUT
actuator runs
in selected
mode
saved alarms
(reset option)
&
&
&
upper limit
lower limit