ABB COMMANDER 1900 Series Programming Manual page 13

...3.4 Set Up Alarms
10.1
1 hour
9.5
T
Alarm On
Alarm Off
Falling Slow Rate
Examples shown are for a trip value of 10%/hour on a PV engineering range of 0.0 to 100.0
9.5
1 hour
Alarm On
Alarm Off
Falling Fast Rate
Examples shown are for a trip value of 10%/hour on a PV engineering range of 0.0 to 100.0
The maximum time it takes to detect an alarm condition
is present (T), in seconds, is calculated as follows:
T = 10.81 +
The time it takes for the alarm state to be cleared once
the alarm condition has been removed is also equal to T.
1 hour
T
1800
T = 10.81 + x 2
10
Fig. 3.5 Slow Rate Alarms with Hysteresis
The maximum time it takes to detect an alarm condition
is present (T), in seconds, is calculated as follows:
T = 10.81 +
The time it takes for the alarm state to be cleared once
the alarm condition has been removed is also equal to T.
10.1
1 hour
T T
1800
T = 10.81 +
10
Fig. 3.6 Fast Rate Alarms with Hysteresis
3 BASIC CONFIGURATION LEVEL...
1800
x 2
Trip Value
T
Alarm On
Alarm Off
T = 382 seconds
1800
x 2
Trip Value
1 hour
Alarm On
Alarm Off
x 2 T = 382 seconds
1 hour
9.5
1 hour
T
Rising Slow Rate
10.1
1 hour
9.5
T
Rising Fast Rate
10.1
T
11