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8.7.63 External fault (4.4.4)
Fig. 114 External fault
Description
The function is used when CU 352 is to be able to receive a fault
signal from an external contact. In case of external fault, CU 352
indicates warning or alarm. In case of alarm, the system changes
to another manual operating mode, for instance "Stop".
Setting range
•
Selection of digital input for the function.
•
Setting of time delay from closing of the contact until CU 352
reacts.
•
Reaction in case of external fault: Warning or alarm and
change of operating mode.
•
Restarting after alarm: Manual or Auto.
Setting via the operating panel
•
Settings > Monitoring functions > External fault > Go to setting
of digital input. Display
8.7.28 Digital inputs (4.3.7)
1. Set the input to "External fault".
2. Press [Back].
3. Set: Time delay, fault indication.
4. If only a warning is required in case of external fault, select
"Warning".If the system is to give alarm and change operating
mode in case of external fault, select operating mode
"Manual" or "Auto".
Factory setting
The function is disabled. If the function is enabled, the following
values have been set from factory:
•
Time delay: 5 seconds.
•
Operating mode in case of alarm: Stop.
•
Restarting: Manual.
64
8.7.64 Limit 1 exceeded (4.4.5 - 4.4.6)
Fig. 115 Limit 1 exceeded
Description
With the function, CU 352 can monitor set limits of analog values.
It will react if the values exceed the limits. Each limit can be set
as a maximum or minimum value. For each of the monitored
values, a warning limit and an alarm limit must be defined.
The function allows you to monitor two different locations in a
pump system at the same time, for instance the pressure at a
consumer and the pump's outlet pressure. This ensures that the
outlet pressure does not reach a critical value.
If the value exceeds the warning limit, a warning is given. If the
value exceeds the alarm limit, the pumps will be stopped.
You can set a delay between the detection of an exceeded limit
and the activation of a warning or an alarm. You can also set a
delay for resetting a warning or an alarm.
A warning can be reset automatically or manually.
appears.
You can set whether the system is to restart automatically after an
alarm, or if the alarm must be reset manually. Restarting can be
delayed by an adjustable time. You can also set a startup delay
ensuring that the system reaches a steady state before the
function becomes active.
Setting range
•
Selection of analog input for the function
•
Input value to be monitored
•
Limit type (Min. limit and Max. limit)
•
Warning limit
•
Alarm limit.
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