Installation Requirements; Safety Regulations; Mains; Aggressive Environment - Grundfos CUE Installation And Operating Instructions Manual

Pos. Description
1 Documentation
2 Accessory bags
3.3.1 Lifting CUE
Always lift the product using the lifting holes. Use a bar to avoid
bending the lifting holes.
Recommended lifting method

4. Installation requirements

Any installation, maintenance and inspection must be
carried out by trained persons.
WARNING
Sharp element
Death or serious personal injury
‐
Use safety knives and protective gloves when
unpacking the product.
WARNING
Lifting hazard
Death or serious personal injury
‐
Use proper lifting equipment when handling the
product.
‐
Follow local regulations.
WARNING
Electric shock
Death or serious personal injury
‐
Before starting any work on the product, make sure
that the power supply has been switched off at least
for as long as stated below and that it cannot be
accidentally switched on.
‐
Touching the electrical parts may be fatal, even after
CUE has been switched off.
Voltage Min. waiting time
4 minutes
0.75 - 3.7 kW
200-240 V
(1 - 5 hp)
0.55 - 7.5 kW
380-500 V
(0.75 - 10 hp)
0.75 - 7.5 kW
525-600 V
(1 - 10 hp)
525-690 V
You can only wait for a shorter period of time if stated on the
nameplate of the product in question.
Related information
6. Electrical connection
10. Servicing the product
6
15 minutes 20 minutes
5.5 - 45 kW
(7.5 - 60 hp)
11 - 90 kW 110 - 250 kW
(15 - 125 hp) (150 - 350 hp)
11 - 90 kW
(15 - 125 hp)
11 - 250 kW
(15 - 350 hp)

4.1 Safety regulations

• The OFF button of the operating panel does not disconnect
CUE from the power supply and must therefore not be used as
a safety switch.
• CUE must be earthed correctly and protected against indirect
contact according to local regulations.
• The leakage current to protective earth exceeds 3.5 mA.
• Enclosure class IP20/21 must not be installed freely accessible,
but only in a panel.
• Enclosure class IP54/55 must not be installed outdoors without
additional protection against weather conditions and the sun.
• The STO function does not disconnect CUE from the power
supply and must therefore not be used as a safety switch.
• The STO function does not prevent unwanted movement from
external forces on the motor, for example, back pressure, and
the motor shaft must be covered.
Always observe local regulations concerning cable cross-section,
short-circuit protection and overcurrent protection.
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, earthing)
• safety on connecting inputs and outputs (PELV).
4.2 IT mains
Do not connect 380-500 V CUE frequency converters to
mains supplies with a voltage between phase and
protective earth of more than 440 V.
In connection with IT mains and earthed delta mains, the mains
voltage may exceed 440 V between phase and protective earth.

4.3 Aggressive environment

CUE must not be installed in an environment where the air
contains liquids, particles or gases which may affect and
damage the electronic components.
CUE contains a large number of mechanical and electronic
components. They are all vulnerable to environmental impact.

4.4 Reduced performance under certain conditions

CUE reduces its performance under these conditions:
• low air pressure (at high altitude)
• long motor cables.
Related information
4.4.1 Reduction at low air pressure
4.4.2 Reduction in connection with long motor cables
4.4.1 Reduction at low air pressure
At altitudes above 2000 m (6600 ft), the PELV
requirements cannot be met.
PELV = Protective Extra Low Voltage.
At low air pressure, the cooling capacity of air is reduced, and CUE
automatically reduces the performance to prevent overload.
It may be necessary to select a CUE unit with a higher
performance.
Related information
4.4 Reduced performance under certain conditions
4.4.2 Reduction in connection with long motor cables
The maximum cable length is 300 m (1000 ft) for unscreened and
150 m (500 ft) for screened cables. In case of longer cables,
contact Grundfos.
CUE is designed for a motor cable with a maximum cross-section
as stated in sections concerning non-UL fuses and UL fuses.