ABB EBN853 Anleitung - Seite 15
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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
setpoint monitoring
upper limit
lower limit
monitoring
ON
&
actuator
stop
safety pos.
last setpoint
Fig. 14:
transmitter
maintenance
monitoring
upper limit
lubricants / elastom.
lower limit
motor / gearing
process contr.
ON
&
Alarm Signal
temperature
temperature
actuator
electronics
(high / low)
(high / low)
behav. at crit.
temp.
MAN
AUT
&
&
actuator runs
in selected
mode
saved alarms
(reset option)
15