Failure Functions; Reversing Prevention Time; Failure Behaviour On Loss Of Signal; Failure Behaviour Initiation On Loss Of Signal - AUMA AC 01.2 Manual

Actuator controls
AC 01.2/ACExC 01.2
9.

Failure functions

Definition
9.1.

Reversing prevention time

Application
Characteristics
9.2.

Failure behaviour on loss of signal

Characteristics
9.2.1.

Failure behaviour initiation on loss of signal

Good signal first
Immediately active
9.2.2.

Failure source (failure reason) for a failure operation: set

Failure functions are started by certain events and lead to a defined action of the
controls or the actuator. A failure operation can be started by a manual action (e.g.
pressing an EMERGENCY stop button). In general, a failure operation is automatically
started by a fault signal from a monitoring function (e.g. loss of signal).
Prevention of impermissible operation states such as: Operation command in direction
OPEN, actuator still runs in direction CLOSE due to the delay time.
The reversing prevention time (off-time between two operation commands in opposite
direction) prevents a restart for a defined interval once the motor has switched off.
Parameters and instructions for setting
Required user level: AUMA (6).
Device configuration M0053
Switchgear M0173
Revers. prevent. time M0174
Default value: 0.3 s seconds
Setting range: 0.1 ... 30.0 s seconds
The failure behaviour can be used to define AC reaction to loss of signal or a defective
signal.
Only in operation mode Remote will the failure behaviour react to a signal loss. In
operation modes Local or Off, there will be no reaction.
Required user level: Specialist (4) or higher.
Customer settings M0041
Failure behaviour M0378
Signal loss beh. M0379
Default value: Good signal first
Setting values:
The <Failure behaviour> is only initiated if the monitored signal fails (falling edge).
This setting ensures that if the signal is missing, the actuator will not start when
switching on (Good signal first).
The <Failure behaviour> is immediately initiated if the monitored signal is missing
(is not present).
For the setting Immediately active:
The actuator can start immediately when switching on!
Risk of personal injuries or damage to the valve.
Ensure that the signal set under parameter Failure beh. source M0385 is present
when switching on.
Should the actuator start unexpectedly: Immediately set selector switch to pos-
ition Local control (LOCAL) or 0 (OFF).
Customer settings M0041
Failure behaviour M0378
Failure beh. source M0385
Failure functions
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