Grundfos CUE Series Product Guide

Functions
Grundfos CUE
17
Constant temperature
The liquid temperature is kept constant, independently
of the flow rate. See fig. 12.
Fig. 12 Constant temperature
The pump is controlled according to a constant temper-
ature. This means that the pump offers a variable flow
rat
e in the Q-range of Q
min.
to Q
max.
, represented by the
parable line in the QH diagram.
Constant other value
Any other value is kept constant. See the CUE installa-
tion and operation instructions for further information.
Setpoints
The setpoint is normally set in the menu Operation via
the CUE control panel. If needed, the setpoint can be
influenced via the external setpoint input.
The CUE offers these setpoint possibilities:
• Setpoint, CUE menu (default)
• External setpoint (default)
• Predefined setpoints (setting via PC Tool)
• GENIbus setpoint (setting via GENIbus).
Setpoint, CUE menu
The setpoint can be set by the user via the CUE control
panel when the CUE is in local operating mode and no
digital inputs are used for predefined setpoints.
Fig. 13 Setpoint, CUE menu
The setpoint range depends on the selected control
mode.
In control mode Open loop, the setpoint is set in% cor-
responding to the required speed. The setting range is
bet
ween the min. and max. curves.
In control mode Proportional differential pressure, the
sett
ing range is equal to 25% to 90% of max. head.
In all other control modes, the setting range is equal to
th
e sensor measuring range.
External setpoint
The setpoint set via the CUE menu can be influenced
by connecting an analog signal to the external setpoint
input.
Fig. 14 Setpoint, CUE menu and external setpoint signal
This function offers these possibilities:
• External setpoint (default)
• Inverse external setpoint (setting via control panel)
• External setpoint with stop (setting via PC Tool)
• External setpoint based on a reference table (set-
ting via PC Tool).
The external setpoint signal is used for calculating the
actu
al setpoint. The minimum signal is the minimum
setpoint, and the maximum signal is the setpoint set via
the CUE menu. See fig. 15.
TM03 8482 1607 TM03 8811 2507TM04 0374 0608
Q
min
Q
max
t
CUE
Setpoint, CUE menu Actual setpoint
TM04 0373 0608
Setpoint, CUE menu Actual setpoint
External setpoint signal

Grundfos CUE Series Specifications

General

Category	DC Drives
Output Voltage	24 V DC
Control Signal	0-10 V, 4-20 mA
Communication	Modbus RTU
Protection Features	Overvoltage, overcurrent, overtemperature, short circuit
Humidity	5% to 95% (non-condensing)
Enclosure class	IP20
Enclosure Rating	IP20