Unidrive
LV
model sizes 1 to 3 Installation Guide
Issue code: uliu1
Installing the Drive 2-3
2.3 Planning the installation
Instructions in numbered steps
The instructions in this section are contained in
numbered steps. In some of these steps you will
need to make a note of a value for future reference
and, to help with identification, the number of the
step.
AC supply protection
Warning
The
AC supply to the Drive must
be fitted with suitable
protection against overload
and short-circuits. Table 2–1
shows recommended fuse
ratings. Failure to observe this
recommendation will cause a
risk of fire.
S
TEP 1 Include a fuse of the specified rating in
each phase of the
AC supply. The use of the
following types of fuse is recommended:
• Europe: Type gG HRC industrial fuses to
IEC 269 (BS88)
• USA: RK1 600V
AC
An MCB or MCCB having the correct thermal
and magnetic trip ratings may be used in place
of fuses, on condition the fault-current clearing
capacity is sufficient for the installation.
Note
UL listing is dependent on the use of the
correct type of UL-listed fuse, and applies
when the symmetrical short-circuit current
does not exceed 5kA. Refer to Appendix B
UL Listing Information.
Table 2–1 Fuse ratings for all versions of
the Unidrive LV
Fuse rating
6 A
10 A
10 A
16 A
16 A
16 A
20 A
35 A
40 A
60 A
70 A
80 A
Power cables
Warning
Wiring must be in accordance
with local regulations and
codes of practice. The table
below shows typical cable sizes
for power input and output
wiring. In the event of a
conflict, local regulations
prevail.
Cable type and size
STEP 2 For the following power connections...
•
AC supply to RFI filter (when used)
•
AC supply (or RFI filter) to Drive
• Drive to motor
• Drive to braking resistor
... use 105°C (221°F) pvc-insulated cable of
suitable voltage rating and having copper
conductors, as shown in Table 2–2.
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