1. CUE – Make Any Pump an E-Pump
Manufactured by Danfoss for Grundfos
Uses Grundfos programming & interface
Supplements the E-Pump range
Any pump can be an E-Pump
Can be used with any manufacturers’ pump
Single source of pump and VFD ( Grundfos pump )
Includes a PID controller
Menu structure similar to the MLE motor
Easy to use start up wizard
No need to be a VFD expert to program / operate the CUE
1-Phase input 1-½ HP through 10 HP
3-Phase input ¾ HP – 300 HP

2. 3-Phase CUEs can not operate on 1-Phase power
CUE HP Coverage Range
3-Phase CUEs can not operate on 1-Phase power

3. CUEs Come with Built-in RFI Filters
RFI filter types are according to EN
C1 – OK for use in domestic areas
C2 – OK for use in domestic & industrial areas
C3 – OK for use in industrial areas with own low-voltage transmitter

4. Grundfos Offers Optional Output Filters for Use with CUEs
Used to reduce the voltage stress on motor windings
Used to reduce the stress on the motor insulation
Used to decrease acoustical noise from the motor
Grundfos offers two types of output filters
dU / dt filters
sine-wave filters
Filters are in IP20 ( NEMA 1 ) enclosures
Need for the filters depends on pump type, cable length and the required reduction of acoustical noise
Consult the CUE Product Guide for detailed descriptions of the output filters
Consult the product guide for a chart that lists filter(s) recommendation

5. Other Optional CUE Accessories
Analog input / output module
1 Analog input
2 Inputs for temp sensors
Sensors
Pressure
Temperature
Differential pressure
Differential temperature
Others
Bus communication modules
Grundfos Local Control Panel
Remote GLCP mounting kit
IP65 Rating
Floor mounting kit ( D1 & D2 cabinets )

6. Selecting the Correct CUE
Start the CUE selection by using the power input to the CUE information
The CUE is sized by using the service factor amperage of the
motor at the operating voltage
CUEs may need to be de-rated based on the following considerations
Elevations over 3,280 FT
High ambient temperatures ( inside of control panel if so installed )
Low motor speeds
Long or large cross section motor cables
CUEs are available in IP21 ( NEMA 1) and IP55 ( NEMA 12 ) enclosures
CUEs are available with or without pressure transducers
Determine whether filters or options are needed

7. Installing a CUE CUEs are intended to be installed indoors
CUEs can be installed in control panels or cabinets
Consult the CUE Product Guide to determine cooling requirements
Allow clearance in front of CUEs with D1 & D2
cabinets to allow the door to be opened

8. Accessing the CUE
The GLCP ( Grundfos Local Control Panel ) can be used to access the CUE
PC Tools E-Products can be used to access the CUE

9. CUE Start Up Wizard
Start up wizard starts when the CUE is first powered up
Can be restarted at any time
A number of parameters are automatically set by selecting the pump type
A number of parameters are set manually
Using motor nameplate information
Using pump nameplate information
The correct pump rotation will automatically be set during the start up wizard
Requires that a pressure of flow sensor is connected to the CUE
Correct pump rotation can be manually set during the start up wizard

10. Available control modes depend on pump type
CUE Control Modes
Open loop ( constant curve )
Proportional differential pressure
Constant differential pressure
Constant pressure
Constant pressure with stop function
Constant level
Constant level with stop function
Constant flow rate
Constant temperature
Constant other value
Available control modes depend on pump type

11. CUE Operating Modes Normal: Will operate to achieve the setpoint
Open loop ( constant curve ) setpoint
Measured value setpoint
Stop Will stop operating
Min Will operate at the minimum speed that is
programed in the CUE
Max Will operate at the maximum speed that is

12. CUE Input / Output Possibilities
Four digital inputs – 3 Programmable
External start / stop ( can’t be changed )
Min curve
Max curve
External fault
Flow switch
Alarm reset
Dry run ( external switch required )
Predefined ramps ( PC Tool setting )
Predefined setpoints ( PC Tool setting )
Not active
Three analog inputs – 2 Standard
Sensor feedback
External setpoint
Additional sensor ( MCB 114 module required )
One analog output
Can be used to indicate different parameters ( speed, actual value, etc. )
Two signal relay outputs
Can be set to different operation modes ( running, warning, alarm, etc. )
Two PT100 / 100 inputs
Used in conjunction temperature sensors
MCB 114 module required
RS485 GENIbus interface
Communicate with Grundfos control systems
Connect to other bus systems such as LONWorks, Profibus, Modbus, etc.
Requires Grundfos CIU communication device

13. CUE Setpoints The setpoint can be set using the CUE control panel
Open loop setpoint is a percentage of full speed
External setpoint
Can be set without changing the power connections
Alternate setpoints
Up to seven setpoints can be programmed ( requires the PC Tool )

14. CUE External Setpoint Menu
The CUE can accept an external setpoint
The input for an external setpoint signal can be set to the following analog signal types
Not active
0 – 10V
0 – 20mA
4 – 20mA
External setpoint can be used with motor in “Controlled” or “Uncontrolled” control mode
The external setpoint can be an inverse setpoint

15. CUE Duty / Standby
For use with (2) CUE controlled pumps installed in parallel
One pump ( CUE ) operates as the “duty” pump, the other is a “standby” pump
The “standby” pump will take over when the “duty” pump has a fault
Only one pump will operate at a time
The duty” and “standby” pumps will alternate after 24 hours of continuous run time

16. CUE Dry Run Protection Can be detected in two ways
CUE checks shaft power and compares it to a dry-pump limit for a set time
Set via the PC Tool
Digital input with a switch
Grundfos LiqTec
Pressure switch
Level switch

17. CUE Stop Function Menu – Constant Pressure Application
The stop function turns the pump off when there is no low demand
The controller checks the flow regularly by reducing the pump speed momentarily and “checking” the change in pressure
If there is no change, or an increase in pressure, the controller detects a no flow condition.
When the controller detects a no flow condition, the speed of the pump is increased until the setpoint X H is reached and the pump stops
When the pressure fall at the same percentage below the setpoint, the pump will restart

18. Constant Pressure Application – The “Stop Trap”
Isolation Valve (Suction)
CRE-Pump
Check Valve
Pressure Sensor
Air in Diaphragm Tank
Water in Diaphragm Tank
System Valves (Discharge)
CUE & Motor
The “ Stop Trap”
Pump &
CUE

19. Motor Bearing Monitoring
Indicates when it’s time to re-lubricate the bearings
Indicates how may times the bearings have been re-lubricated
Indicates when it’s time to replace the bearings
Default function based on number of hours & speed of pump
Extended function utilizes bearing temperature in the calculation
Requires a MCB 114 sensor input module & temperature sensors

20. CUE Standstill Heating
Can be set to not active or active
If set to active, an AC voltage will be applied to the motor windings when the
motor is not operating
The voltage will generate heat which will prevent condensation in the motor

21. Limit Exceeded
Information, warning or alarm if a low or high limit is exceeded
Input possibilities
Measured value input
Motor temperature
Output possibilities
Signal relay
Analog output
Warning or alarm
Set via the PC Tool