3
English (US)
2. Symbols used in this document
3. Introduction
This manual introduces all aspects of your Grundfos CUE
frequency converter in the power range of 1.8 to 177 A
(0.55 to 90 kW).
Always keep this manual close to the CUE.
3.1 General description
CUE is a series of external frequency converters especially
designed for pumps.
Thanks to the start-up guide in the CUE, the installer can quickly
set central parameters and put the CUE into operation.
Connected to a sensor or an external control signal, the CUE will
quickly adapt the pump speed to the actual demand.
3.2 Applications
The CUE series and Grundfos standard pumps are a supplement
to the Grundfos E-pumps range with integrated frequency
converter.
A CUE solution offers the same E-pump functionality cases:
• in the supply voltage or power ranges not covered by the
E-pump range
• in applications where an integrated variable frequency drive is
not desirable or permissible.
3.3 References
Technical documentation for Grundfos CUE:
• The manual contains all information required for putting the
CUE into operation.
• The data booklet contains all technical information about the
construction and applications of the CUE.
• The service instructions contain all required instructions for
dismantling and repairing the variable frequency drive.
Technical documentation is available at www.grundfos.com >
Grundfos Product Center.
If you have any questions, please contact the nearest Grundfos
company or service workshop.
4. Safety and warnings
4.1 Warning
Wait only for shorter time if stated so on the nameplate of the
CUE in question.
4.2 Safety regulations
• The on/off button of the control panel does not disconnect the
CUE from the power supply and must therefore not be used as
a safety switch.
• The CUE must be grounded correctly and protected against
indirect contact according to local regulations.
• The leakage current to ground exceeds 3.5 mA.
• Enclosure class NEMA 1 must not be installed freely
accessible, but only in a panel.
• Enclosure class NEMA 12 must not be installed outdoors
without additional protection against weather conditions and
the sun.
• Always observe national and local regulations as to cable
gauge size, short-circuit protection and overcurrent protection.
4.3 Installation requirements
The general safety necessitates special considerations as to
these aspects:
• fuses and switches for overcurrent and short-circuit protection
• selection of cables (mains current, motor, load distribution and
relay)
• net configuration (IT, TN, grounding)
• safety on connecting inputs and outputs (PELV).
4.3.1 IT mains
In connection with IT mains and grounded delta mains, the mains
voltage may exceed 440 V between phase and ground.
4.3.2 Aggressive environment
The CUE contains a large number of mechanical and electronic
components. They are all vulnerable to environmental impact.
4.4 Reduced performance under certain conditions
The CUE will reduce its performance under these conditions:
• low air pressure (at high altitude)
• long motor cables.
The required measures are described in the next two sections.
Warning
If these safety instructions are not observed,
it may result in personal injury.
If these safety instructions are not observed,
it may result in malfunction or damage to the
equipment.
Notes or instructions that make the job easier
and ensure safe operation.
Warning
Any installation, maintenance and inspection
must be carried out by trained personnel.
Warning
Touching the electrical parts may be fatal, even
after the CUE has been switched off.
Before performing any work on the CUE, the
mains supply and other input voltages must be
switched off at least for as long as stated below.
Voltage Min. waiting time
4 minutes 15 minutes 20 minutes
200-240 V
1-5 Hp
(0.75 - 3.7 kW)
7.5 - 60 Hp
(5.5 - 45 kW)
380-500 V
0.75 - 10 Hp
(0.55 - 7.5 kW)
15-125 Hp
(11-90 kW)
525-600 V
1-10 Hp
(0.75 - 7.5 kW)
525-690 V
15-125 Hp
(11-90 kW)
Warning
Do not connect 380-500 V CUE variable frequency
drive to mains supplies with a voltage between
phase and ground of more than 440 V.
The CUE should not be installed in an
environment where the air contains liquids,
particles or gases which may affect and damage
the electronic components.
To Next Page
Loading...
Need help?
General
