English (GB)
17
11.2.6 Proportional pressure-control mode
(only applicable for E-systems)
Fig. 14
Proportional pressure
Description
The function can only be enabled in pressure-controlled systems
and automatically adapts the setpoint to the actual flow rate to
compensate for flow-dependent dynamic losses.
Maximum flow rate at the selected setpoint. A filter factor can
beset to prevent fluctuation. The adaptation can only be square.
See fig.
The function has these purposes:
• to compensate for pressure losses
• to reduce the energy consumption
• to increase the comfort for the user.
Activation of function through PC-tool E-products
Settings > Primary controller.
1. Select: Enabled proportional pressure.
2. Set: Influence at zero flow.
3. Set: Filter factor
4. Select: Hmax / Enter value. Based on pump data.
5. Select: Qnom / Enter value. Based on pump data.
6. Select: Hnom / Enter value. Based on pump data.
Setting via control panel. This is only applicable when the
function is enabled in PC-Tool E-product.
1. Press
button for 4 seconds. Let go of the button when the
text "PPS" appears on the display.
2. Adjust the "PPS" value with the
and
buttons.
11.3 Functions for tank-filling systems
11.3.1 Cascade control
The cascade control function for tank-filling systems is designed
to fill the tank with focus on protecting the piping and preventing
water hammer. The cascade is time-dependent and starts and
stops the pumps in a pre-defined sequence. See fig.
on page
.
11.3.2 Standby pumps
Systems with more than two pumps will as default set one pump
as standby pump.
The status as standby pump alternates to ensure that all pumps
have equal numbers of operating hours.
In ES-systems, the speed-controlled pump cannot be a standby
pump.
11.3.3 Maximum level exceeded
This function protects against the risk of overfilling the tank.
The level is monitored and if the level is higher than 95 % of the
height of the tank, the pumps are stopped, and the display
indicates high limit
, and the
indicator light illuminates.
12. Data communication
The CU 323 must have a CIM module (Communication Interface
Module) fitted to be able to transfer data to the SCADA system or
to a mobile phone.
Various CIM modules are available, depending on the type of
network. See the Hydro Multi-B data booklet or contact Grundfos
for further information regarding CIM modules.
TM
06
28
45
47
14
Pos.
Description
A
Pressure at zero flow. Starting point of
proportional-pressure control
(influence at 0 flow = x % of setpoint)
B
Qnom
C
Setpoint
Note
The "PPS" value is defined in bar at zero flow.
H
C
A
B
Q
RESET
H
.
L
PT
