Water supply
Comprehensive range. Superior features.
With over 100 different configuration possibilities, covering a power range from 0.55 kW to 250 kW, CUE represents one of the most comprehensive and versatile ranges of frequency converters for pump applications currently on the market. The CUE range is available with 5 different power supplies, 2 enclosure classes IP20/21 (Nema 1) / IP55 (Nema 12), and no less than 24 different output powers. So whatever you need, there is a suitable CUE solution for the job at hand.
What's more, CUE is packed with splendid features that provide maximum convenience and enhanced operational ease. Just take a look at the added value you get with CUE.
Intuitive start-up guide
The CUE start-up guide enables easy installation and commissioning, and plug-and-pump convenience. Only a few settings need to be specified by the installer on-site, the rest of the set-up is either done automatically or factory preset.
Smart user interface
CUE offers quick and easy set-up and commissioning compared to a standard frequency converter, because it only requires very few settings at start-up. Simply key in application-specific variables such as motor data, pump family, control function (e.g. constant pressure), sensor type, and setpoint, and CUE will automatically set all necessary parameters; i.e. ramp times, min. speed, controller constants, available functions, and so on.
After completing the start-up guide, CUE’s menu structure is equivalent to the R100 menu structure used in connection with Grundfos E-pumps.
Plug-and-pump convenience
When installing and commissioning CUE, all you need to do is specify a few application-specific settings and variables. You get the familiar Grundfos R100 user interface, so it is a simple and easy task which can be done in just a few minutes. CUE also offers extensive possibilities of monitoring of pump, motor, frequency converter, and surroundings, as well as remote control and supervision by means of bus interface and inputs/outputs.
Constant – whatever you want
When we say constant, we mean constant! CUE has a built-in PI controller that provides closed-loop control of whatever value you want to control:
Constant pressure with or without stop function
- With stop function: The head is kept constant at high flow.
- On/off operation at low flow.
- Without stop function: The pressure is kept constant irrespective of the flow.
Constant differential pressure
- The differential pressure is kept constant irrespective of the flow.
Proportional pressure
- The head is reduced at low flow and increased at high flow.
Constant level with or without stop function
- With stop function: The fluid level is kept constant at high flow. On/off operation at low flow.
- Without stop function: The fluid level is kept constant irrespective of the flow.
Constant temperature
- The fluid temperature is kept constant irrespective of the flow.
Proportional pressure
- The proportional pressure function ensures that the differential pressure in a circulating application, e.g. a heating or an air-conditioning system, is sufficient at low-flow as well as at high-flow demands. The differential pressure is automatically raised with increased flow.
Stop function
- In most water supply applications the required flow can be very low, sometimes even equal to zero. In those situations on/off operation of the pump according to demand is more economical. CUE offers a stop function for constant pressure or constant level applications. The stop function furthermore prevents the pump from running against closed valve with the risk of heating up the water in the pump, and thus growth of unhealthy bacteria or damage of the shaft seal.
Dry-running protection
- CUE offers protection against dry running, as one of the inputs can be dedicated to a dry-running detector.
Duty/standby
- By interconnecting two CUE converters via the standard built-in GENIbus interface, a duty/standby function of the two pumps can be obtained.
Motor bearings supervision
- CUE has a motor bearings monitoring function that displays an automatic warning when it is time for relubrication or replacement of bearings. This function can be further optimised by the addition of bearings temperature measurement (requires an IO module), which provides a warning or discontinues pump operations automatically in case of overheating.
The comprehensice CUE range
When opting for a CUE solution you get the choice of the following versions of CUE; all available in two enclosure classes IP20/21 (Nema1) or IP55 (Nema12):
- 1-phase, 1x200-240 V, 50/60 Hz (1.1-7.5 kW), C1
- 3-phase, 3x200-240 V, 50/60 Hz (0.75 - 45 kW), C1
- 3-phase, 3x380-500 V, 50/60 Hz (0.55 - 250 kW), C1 up to 90 kW, C2 above 90 kW
- 3-phase, 3x525-600 V, 50/60 Hz (0.75– 7.5 kW), C3
- 3-phase, 3x525-690 V, 50/60 Hz (11 - 250 kW), C3
C1: units with built-in EMC filter for normal household applications. C2: units with built-in EMC filters for industrial applications. C3: units without EMC filter (only applicable in industrial applications).
CUE overview
Stay in touch from a distance
We believe in open protocols. That is why your CUE solution can be connected to any SCADA system, allowing you remote access to your pump data anywhere. You can control the pump, change the settings, and access information such as energy consumption, alarms and operation data. Connections can be created either via wired networks or wireless technology such as GPRS/GSM networks. If you choose WebAccess via Grundfos Remote Management system (GRM), you can communicate via your computer, the Internet, or via mobile phones as you choose.
Helps reduce costs
Taking complete control has many advantages. The time spent on reporting, data collection, etc. is minimised – as are service visits. When you always know how your stations are doing, maintenance visits can be scheduled for maximum efficiency – and emergencies reduced to the barest minimum.
Download materials
Accessories
Add-on card
Analogue I/O module offering:
Two inputs for Pt100/1000 temperature sensors (the card will automatically detect if the sensor is a Pt100 or a Pt1000 sensor). One analogue 0/4-20 mA input for an additional sensor.
Motor filters
All CUE frequency converters deliver a non-sinusoidal voltage to the motor. In some cases it is required or desired to filter the output voltage to make it more sinusoidal, because:
- It reduces the dv/dt and the peak voltage delivered to the motor
- It reduces the acoustic noise generated in the motor windings
- It allows the use of long motor cables
The following motor filters are available:
dU/dt-filters
Split on 16 different filters covering:
- Power range: 11 to 250 kW
- Voltage range: 3x380-500 V and 3x525-690 V
- Insulation class: I P20
- Ambient temperature: Max. 45°C
Sine wave filters
Split on 23 different filters covering:
- Power range: 0.55 to 250 kW
- Voltage range: 1x200-240 V, 3x200-240 V, 3x380-500V and 3x525-690 V
- Insulation class: I P20
- Ambient temperature: Max. 45°C
Sensors
The following sensors can be used in connection with CUE. All sensors are with 4-20 mA output signal.
- Pressure sensors - up to 25 bar
- Temperature sensors
- Differential pressure sensors
- Differential temperature sensors
- Flow meters
- Potentiometer box for external setpoint setting
Gateways
CUE is equipped with a standard RS485 GENIbus interface. Gateways to convert to other bus standards can be delivered as an accessory.
The CIU family can convert to the most common fieldbuses in the world:
- CIU100 converts from GENIbus to LonWorks
- CIU150 converts from GENIbus to Profibus
- CIU200 converts from GENIbus to Modbus
- CIU250 is a GSM modem which can send SMS messages in case of alarms, etc.
Other accessories
- Dry-running protection sensor LiqTec
- Control MPC – a multi-pump control system for control of parallel-connected CUE pump solutions.