Grundfos CONTROL MPC, Инструкция по установке и эксплуатации

Страница: 53 / 68

English (GB)
53
8.7.51 External fault (4.4.4)
Fig. 101 External fault
Description
The function is used when the CU 352 is to be able to receive a
fault signal from an external contact. In case of external fault, the
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 the
CU 352 reacts.
• Reaction in case of external fault: Warning or alarm and
change of operating mode.
• Restarting after alarm: Manual or automatic.
Setting via control panel
• Settings > Monitoring functions > External fault > Go to setting
of digital input.
Display
Digital inputs (4.3.7)
appears.
6. Set the input to "External fault".
7.
.
8. Set: Time delay, fault indication.
9. 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.
8.7.52 Limit 1 exceeded (4.4.5 - 4.4.6)
Fig. 102 Limit 1 exceeded
Description
With this function, the 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 makes it possible to monitor two different locations
in a pump system at the same time. For instance the pressure at
a consumer and the pump discharge pressure. This ensures that
the discharge 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.
A delay can be set between the detection of an exceeded limit
and the activation of a warning or an alarm. A delay can also be
set for resetting a warning or an alarm.
A warning can be reset automatically or manually.
It is possible to 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. It is also possible to set a
start-up 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./max.)
• warning limit
• alarm limit.
Setting via control panel
• Settings > Monitoring functions > Limit 1 exceeded / Limit 2
exceeded > Go to setting of analog input.
1. Select analog input.
2. Select: Input value to be monitored.
Display 4.3.8.1.1 appears.
3. Select input.
4.
.
5. Set the minimum and maximum sensor value.
6.
x 2.
7. Select: Input value to be monitored.
8. Select input.
9.
.
10. Select:
• Min. limit / Max. limit.
• Set delays.
11.
.
12. Select:
• Set warning limit
• Enabled.
13. Set limit.
14. Select resetting: Auto / Manual.
15.
.
16. Select:
• Set alarm limit
• Enabled.
17. Set limit.
18. Select resetting: Auto / Manual.
19.
.
20. Select: Enabled.
Factory setting
The function is disabled.
Note
Analog inputs must be correctly set before the
function is enabled. See section
8.7.28 Analog inputs
(4.3.8)
.