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English (US)
6.3 Space requirements and air circulation
CUE units can be mounted side by side, but as a sufficient air
circulation is required for cooling, these requirements must be
met:
• Sufficient free space above and below the CUE. See table
below.
• Ambient temperature up to 122 °F (50 °C).
• Hang the CUE directly on the wall, or fit it with a back plate.
See fig. 3.
Fig. 3 CUE hung directly on the wall or fitted with a back
plate
Required free space above and below the CUE
For information about enclosures, see table in section
17.1 Enclosure.
6.4 Mounting
1. Mark and drill holes. See the dimensions in section 17.2 Main
dimensions and weights.
2. Fit the screws, but leave loose. Mount the CUE, and tighten
the four screws.
Fig. 4 Drilling of holes
7. Electrical connection
Fig. 5 Example of three-phase mains connection of the CUE
with mains switch, back-up fuses and additional
protection
7.1 Electrical protection
7.1.1 Protection against electric shock, indirect contact
Protective conductors must always have a yellow/green (PE) or
yellow/green/blue (PEN) color marking.
Instructions according to EN IEC 61800-5-1:
• The CUE must be stationary, installed permanently and
connected permanently to the mains supply.
• The ground connection must be carried out with duplicate
protective conductors or with a single reinforced protective
conductor with a gauge size of minimum 8 AWG (10 mm
2
).
7.1.2 Protection against short-circuit, fuses
The CUE and the supply system must be protected against short-
circuit.
Grundfos demands that the back-up fuses mentioned in section
17.6 Fuses and cable gauge size are used for protection against
short-circuit.
The CUE offers complete short-circuit protection in case of a
short-circuit on the motor output.
7.1.3 Additional protection
If the CUE is connected to an electrical installation where an
earth leakage circuit breaker (ELCB) is used as additional
protection, the circuit breaker must be of a type marked with the
following symbols:
The circuit breaker is type B.
The total leakage current of all the electrical equipment in the
installation must be taken into account.
The leakage current of the CUE in normal operation can be seen
in section 17.7.1 Mains supply (L1, L2, L3).
During start-up and in asymmetrical supply systems, the leakage
current can be higher than normal and may cause the ELCB to
trip.
TM03 8859 2607
Enclosure Space [in. (mm)]
A2, A3, A4, A5 3.9 (100)
B1, B2, B3, B4, C1, C3 7.9 (200)
C2, C4 8.9 (225)
The user is responsible for mounting the CUE
securely on a firm surface.
TM03 8860 2607
Warning
The owner or installer is responsible for ensuring
correct grounding and protection according to
national and local standards.
Warning
Before making any work on the CUE, the mains
supply and other voltage inputs must be
switched off for at least as long as stated in
section 4. Safety and warnings.
TM03 8525 1807
Warning
The CUE must be grounded correctly and
protected against indirect contact according to
national regulations.
The leakage current to ground exceeds 3.5 mA,
and a reinforced ground connection is required.
The leakage current to ground exceeds 3.5 mA.
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