Pi Controller (4.1.1); Alternative Setpoints 2-7 (4.1.2.1 - 4.1.2.7) - Grundfos Control DDD Montage- Und Betriebsanleitung

8.7.2 PI controller (4.1.1)

Fig. 43 PI controller
Description
The system includes a standard PI controller which ensures that
the pressure is stable and corresponds to the setpoints of the
remote sensors.
You can adjust the PI controller if a faster or slower reaction to
changes of consumption is required.
To obtain a faster reaction, increase Kp and reduce Ti.
To obtain a slower reaction, decrease Kp and increase Ti.
Setting range
• Gain Kp: 0-30.
• Integral time Ti: 0.1 to 3600 seconds.
Setting via operating panel
• Settings
• Primary controller
• PI controller.
1. Set the gain (Kp) and integral time (Ti).
Note: Usually it is not necessary to adjust Kp.
Factory setting
• Kp: 0.5
• Ti: 1 second.
8.7.3 Alternative setpoints (4.1.2)
Fig. 44 Alternative setpoints
28
Description
The function allows you to select up to six setpoints (2 to 7) as
alternatives to the primary setpoint (1). The primary setpoint (1) is
set in the "Operation" menu.
Every alternative setpoint can be addressed manually to a
separate digital input (DI). When the contact of the input is
closed, the alternative setpoint applies.
If more than one alternative setpoint has been selected, and they
are activated at the same time, CU 354 will select the setpoint
with the lowest number.
Setting range
• Six setpoints, No 2 to 7.
Factory setting
No alternative setpoints have been selected.

8.7.4 Alternative setpoints 2-7 (4.1.2.1 - 4.1.2.7)

Fig. 45 Alternative setpoints 2-7
For each alternative setpoint, select the digital input to activate
the setpoint.
Setting via operating panel
• Settings > Primary controller > Alternative setpoints.
1. Select alternative setpoint.
2. Select: Go to setting of digital input.
Display Digital inputs (4.3.7)
3. Set the input.
4. Press [Back].
5. Select the menu line of the setpoint.
6. Set the setpoint.
Factory setting
No alternative setpoints have been set.
appears.