Grundfos Control MPC-Serie Installationsanleitung Seite 48

8.7.29 Functions of digital inputs (4.3.7.1)
Fig. 77 Functions of digital inputs
Description
A function can be related to the digital inputs.
Setting range
You can select one function in each display:
Function Contact activated
Not used
Min. duty
Max. duty
User-defined duty
External fault
Dry-running protection
Flow switch
Resetting of alarm
Emergency run
Fault, pilot pump
Alternative setpoint 2-7
Reduced operation
Stop pump 1-6
Stop pilot pump
In the display, you can only select pumps defined in
the system.
See the relevant sections for further information about the
functions.
Generally, a closed contact activates the function selected.
Setting via the operating panel
• Settings > Secondary functions > Stop function > Go to setting
of digital input.
48
Operating mode
=
"Min."
Operating mode
=
"Max."
Operating mode
=
"User-defined"
= External fault
= Water shortage
= Flow
= Alarms are reset
Operating mode
=
"Emergency run"
= Fault
The setpoint is
=
selected
Activation of
=
"Reduced operation"
Forces the pump to
=
stop
Factory setting
Digital input Function
External start/stop. Open contact = stop.
DI1 (CU 352) [10]
Note: Input No 1 cannot be changed.
Monitoring of water shortage (dry-running
DI2 (CU 352) [12] protection). Open contact = water shortage
(if the system is supplied with this option).
Monitoring of water shortage requires a pressure or
level switch connected to the system.
8.7.30 Analog inputs (4.3.8)
Fig. 78 Analog inputs
Description
Each analog input can be activated and related to a certain
function.
As standard, the system has three analog inputs. If the system
incorporates an IO 351B module (option), the number of analog
inputs is 5.
All analog inputs are shown so that their physical position in the
system can be identified. A redundant primary sensor can be
fitted as backup for the primary sensor in order to increase
reliability and prevent stop of operation.
If two sensors are to be redundant, each must have a
separate analog input.
Example
AI1 (CU 352) [51]:
AI1: Analog input No 1
(CU 352): CU 352
[51]: Terminal No 51
Setting via the operating panel
• Settings > Secondary functions > Stop function > Go to setting
of analog input.