31
4. Mark
Go to setting of analog input
with
or
and
Overview of analog inputs (4.3.8)
appears.
Select the analog input (AI) for the primary sensor and set the
parameters for this sensor. Return to display
.
5. Select the control parameter for the primary sensor with
or
and press
.
Note:
If the primary parameter is discharge pressure, AI1
(CU 351) must be set to this parameter.
If the primary parameter is external pressure or flow rate, AI3
(CU 351) must be set to this parameter.
Factory setting
The primary parameter is discharge pressure. The sensor is
connected to AI1 (CU 351).
10.7.9 Redundant primary sensor (4.1.5)
Fig. 35
Redundant primary sensor
Description
A redundant primary sensor functions as a backup sensor for the
primary sensor. It measures the control parameter which in this
case is the discharge pressure.
The CU 351 usually controls on the basis of the primary sensor
connected to analog input AI1 (CU 351). If the primary sensor
falls out of its sensor range, the redundant primary sensor
connected to analog input AI3 (CU 351) will take over and then
report to the PI controller. In this situation a warning is indicated.
If both the primary sensor and the redundant primary sensor fall
out of their sensor range, all pumps will be stopped.
The CU 351 also indicates warning if the output signals from the
primary sensor and the redundant primary sensor differ more
than ±10% or more than 4% of full scale of the primary sensor,
but the Hydro MPC will still be controlled by the primary sensor.
Note:
The redundant primary sensor must be of the same type
and size as the primary sensor and be mounted at the same
position in Hydro MPC.
Setting range
The analog input AI3 (CU 351) can be set to this function.
Setting via control panel
1. Mark the
Settings
menu with
.
2. Mark
Primary controller
with
or
and press
.
3. Mark
Redundant primary sensor
with
or
and press
.
4. Mark
Go to setting of analog input
with
or
and
press .
Now the display
Overview of analog inputs (4.3.8)
Select
AI3
and
Redundant primary sensor
. The range of the
sensor will now automatically be set to the same values as the
primary sensor, and these settings cannot be changed.
Factory setting
Usually, no redundant primary sensor is selected from factory.
The function can, however, be selected as factory setting if the
redundant primary sensor is ordered as option.
10.7.10 Pump cascade control (4.2)
Fig. 36
Pump cascade control
In this menu section it is possible to set the functions connected
to pump cascade control.
It is only necessary to make setting in this menu if the
functionality is to be expanded with for instance min. time
between start/stop, permissible number of starts/hour and
standby pumps.
The following menus can be selected:
•
Min. time between start/stop
•
Max. number of starts/hour
•
Standby pumps
•
Forced pump changeover
•
Pump test run.
10.7.11 Min. time between start/stop (4.2.1)
Fig. 37
Min. time between start/stop
TM
03
236
9
400
5
TM
0
3
2
363
4
005
TM
03
23
67
40
05
www.motralec.com / [email protected] / 01.39.97.65.10
