CUE – Make Any Pump an E-Pump
• Manufactured by Danfoss for Grundfos
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Uses Grundfos programming & interface
• Supplements the E-Pump range
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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
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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
CUE HP Coverage Range
3-Phase CUEs can not operate on 1-Phase power
CUEs Come with Built-in RFI Filters
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RFI filter types are according to EN 61800-3
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
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
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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
Other Optional CUE Accessories
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Analog input / output module
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Sensors
 1 Analog input
 2 Inputs for temp sensors
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Pressure
Temperature
Differential pressure
Differential temperature
Others
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Bus communication modules
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Grundfos Local Control Panel
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Remote GLCP mounting kit
 IP65 Rating
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Floor mounting kit ( D1 & D2 cabinets )
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
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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
Installing a CUE
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CUEs are intended to be installed indoors
CUEs can be installed in control panels or cabinets
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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
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
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
CUE Control Modes
• Open loop ( constant curve )
• Constant level
• Proportional differential pressure
• Constant level with stop function
• Constant differential pressure
• Constant flow rate
• Constant pressure
• Constant temperature
• Constant pressure with stop function
• Constant other value
Available control modes depend on pump type
CUE Operating Modes
• Normal:
Will operate to achieve the 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
programed in the CUE
 Open loop ( constant curve ) setpoint
 Measured value setpoint
CUE Input / Output Possibilities
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Four digital inputs – 3 Programmable
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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
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Sensor feedback
External setpoint
Additional sensor ( MCB 114 module
required )
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One analog output
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Two signal relay outputs
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Can be set to different operation modes
( running, warning, alarm, etc. )
Two PT100 / 100 inputs
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Can be used to indicate different
parameters ( speed, actual value, etc. )
Used in conjunction temperature sensors
MCB 114 module required
RS485 GENIbus interface
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Communicate with Grundfos control
systems
Connect to other bus systems such as
LONWorks, Profibus, Modbus, etc.
• Requires Grundfos CIU
communication device
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 )
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
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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
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
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
CUE Stop Function Menu – Constant Pressure Application
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The stop function turns the pump off when
there is no low demand
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The controller checks the flow regularly by
reducing the pump speed momentarily and
“checking” the change in pressure
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If there is no change, or an increase in
pressure, the controller detects a no flow
condition.
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When the controller detects a no flow
condition, the speed of the pump is increased
until the setpoint + 0.5 X H is reached and
the pump stops
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When the pressure fall at the same percentage
below the setpoint, the pump will restart
Constant Pressure Application – The “Stop Trap”
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Isolation Valve (Suction)
CRE-Pump
Check Valve
Pressure Sensor
Air in Diaphragm Tank
Water in Diaphragm Tank
System Valves (Discharge)
5
6
CUE
&MLE
Motor
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3
2
4
7
The “ Stop Trap”
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
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
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