Band alarm (setpoint-process)
PROCESS
SETPOINT
Hysteresis
OFF
Deviation alarm
Comparison value
(Par. 25)
PROCESS
SETPOINT
Hysteresis
OUT
ON
OFF
Independent alarm reff erring to the setpoint
SETPOINT
OUT
ON
OFF
32
ATR902 - User manual
Comparison value
(Par. 25)
Hysteresis
Time
Time
Comparison value
(Par. 25)
Hysteresis
Time
The alarm can be:
• Active outside
• Active inside
In the fi gure it is active outside.
Alarm can be of:
• Upper deviation
• Lower deviation
In the fi gure it is of upper deviation.
Alarm can be:
• Active over
• Active under
In the fi gure it is active on.
Each intervention can be related to
a cycle lock and/or to an acoustic
signalling.