Grundfos CRE Series - Setting the Product; Setpoint; Operating Mode; Set Manual Speed

10. Setting the product
You can set control functions via Grundfos GO, Grundfos GO Link
or the HMI 300 or 301 operating panel.
• If only one function name is mentioned, it refers to both
Grundfos GO and the operating panel.
• If a function name is mentioned in a parenthesis, it refers to a
function on the operating panel.
10.1 Setpoint
When you have selected the desired control mode, set the setpoint.
Related information
10.5 Control mode
10.2 Operating mode
Possible operating modes
Normal
The product runs according to the selected control
mode.
Stop The product stops.
Min.
The product runs at minimum speed. You can use the
minimum curve mode in periods in which a minimum
flow is required. When operating according to the
minimum curve, the pump is operating like an
uncontrolled pump.
Max.
The product runs at maximum speed. You can use the
maximum curve mode in periods in which a maximum
flow is required. When operating according to the
maximum curve, the pump is operating like an
uncontrolled pump.
Manual
The product is operating at a manually set speed, and
the setpoint via bus and setpoint influence function are
overruled.
User-
defined
speed
The product is operating at a speed set by the user.
Q
H
Max.
3
1
2
Min.
Stop
TM064024
Pos. Description
1 Normal
2 Normal
3 Manual
10.3 Set manual speed
The function is only available in the HMI 300 and 301 operating
panels.
Use this function to set the speed in percentage of the maximum
speed. When you have set the operating mode to Manual, the
product starts running at the set speed.
With Grundfos GO, you can set the speed via the Setpoint menu.
10.4
Set user-defined speed
Use this function to set the motor speed in percentage of the
maximum speed. When you have set the operating mode to User-
defined speed, the motor starts running at the set speed.
10.5 Control mode
You can choose between the following control modes:
• Prop. pressure (proportional pressure)
• Const. pressure (constant pressure)
• Const. temp. (constant temperature)
• Con. diff. press. (constant differential pressure)
• Con. diff. temp. (constant differential temperature)
• Const. flow rate (constant flow rate)
• Const. level (constant level)
• Const. other val. (constant other value)
• Const. curve (constant curve).
10.5.1 Proportional pressure
The head of the pump is reduced at decreasing water demand and
increased at rising water demand. See the figure below.
This control mode is especially suitable in systems with relatively
large pressure losses in the distribution pipes. The head of the
pump increases proportionally to the flow in the system to
compensate for the large pressure losses in the distribution pipes.
The setpoint can be set with an accuracy of 4 inches (10 cm). The
head against a closed valve is half the setpoint. The setting range is
between 25 % and 90 % of maximum head.
For more information about settings, see section on proportional-
pressure setup.
H
Q
Hset
Hset
2
TM057909
Proportional pressure
Example:
• Factory-fitted differential-pressure sensor.
p
TM057880
Proportional pressure
Controller settings
For the recommended controller settings, see the section on the
controller.
Related information
10.15 Controller (Controller settings)
10.5.2
Constant pressure
We recommend this control mode if the pump is to deliver a
constant pressure, independently of the flow in the system. The
pump maintains a constant pressure independently of the flow rate.
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English (US)