Unidrive
LV
model sizes 1 to 3 Installation Guide
Issue code: uliu1
Installing the Drive 2-11
Enclosure layout
STEP 9 Use one of the following enclosure
layouts, depending on the requirements of the
installation:
Routine EMC precautions Refer to
Figure 2–4 which shows the recommended
layout for two Drives, and the signal and power
cables.
Compliance with EMC emission
standards Refer to Figure 2–5 which shows
the recommended layout for two Drives, two
RFI filters, and the signal and power cables.
S
TEP 10 Decide whether the enclosure is to be
sealed or ventilated, as follows:
A sealed enclosure can give a high ingress-
protection rating, but with reduced heat
removal capabilities. If possible, locate heat-
generating equipment (other than braking
resistors) in the lower part of the enclosure to
encourage internal convection. If necessary, a
taller enclosure, and/or air-circulation fans
inside the enclosure, can be used. For
calculating the minimum size of sealed
enclosure that will adequately cool the Drive(s),
refer later in this chapter to Calculating the size
of a sealed enclosure.
If a high ingress-protection rating is not
required, a ventilated enclosure can be used
with a fan to supply forced air cooling; this can
give a lower ambient temperature than a sealed
enclosure. For calculating the minimum
required volume of cooling air, refer later in this
chapter to Calculating the air-flow in a ventilated
enclosure.
S
TEP 11 For compliance with EMC emission
standards, ensure the enclosure is fitted with an
unpainted metal back-plate for mounting the
Drive and RFI filter. For example, a zinc plated
steel back-plate is suitable (see Figure 2–5).
S
TEP 12 Ensure the Drive is installed vertically for
best flow of cooling air through the Drive and
heatsink.
S
TEP 13 Ensure the clearances around the Drive are
as follows:
Above and below: ≥100mm (4 in)
Both sides: ≥5mm (
1
/
4
in)
Note
When surface mounting a model size 3,
allow a clearance of 150mm (6in) above the
Drive; this is required for dismounting. A
minimum clearance of 100mm (4in) is
required for ventilation.
For overall dimensions and weights of the Drive
and RFI filter, see Appendix C Data.
S
TEP 14 When compliance with EMC emission
standards is required, the RFI filter must be
installed at the specified position for each Drive
(see Figure 2–5).
S
TEP 15 When a braking resistor is to be used, it
can be installed outside or inside the enclosure.
When installed inside, it must be mounted in
the upper part of the enclosure to prevent it
heating the other equipment by convection.
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