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Unidrive User Guide 37
Issue Number: 9 www.controltechniques.com
4 Electrical Installation
This chapter describes the how to electrically install the drive. Key
features include:
• EMC compliance with shielding / grounding accessories
• Product rating, fusing and cabling information
• Brake resistor details (selection / ratings)
N
Drives are suitable for use on supplies of installation category III and
lower, according to IEC 60664-1. This means they may be connected
permanently to the supply at its origin in a building, but for outdoor
installation additional overvoltage suppression (transient voltage surge
suppression) must be provided to reduce category IV to category III.
4.1 Power connections
Figure 4-1 Unidrive Size 1 to 2 power connections
Electric shock risk
The voltages present in the following locations can cause
severe electric shock and may be lethal:
• AC supply cables and connections
• Output cables and connections
• Many internal parts of the drive, and external option
units
Isolation device
The AC supply must be disconnected from the drive using
an approved isolation device before any cover is removed
from the drive or before any servicing work is performed.
STOP function
The STOP function does not remove dangerous voltages
from the drive or any external option units.
Stored charge
The drive contains capacitors that remain charged to a
potentially lethal voltage after the AC supply has been
disconnected. If the drive has been energised, the AC
supply must be isolated at least ten minutes before work
may continue.
Normally, the capacitors are discharged by an internal
resistor. Under certain, unusual fault conditions, it is possible
that the capacitors may fail to discharge, or be prevented
from being discharged by a voltage applied to the output
terminals. If the drive has failed in a manner that causes the
display to go blank immediately, it is possible the capacitors
will not be discharged. In this case, consult Control
Techniques or their authorised distributor.
Equipment supplied by plug and socket
Special attention must be given if the drive is installed in
equipment which is connected to the AC supply by a plug
and socket. The AC supply terminals of the drive are
connected to the internal capacitors through rectifier diodes
which are not intended to give safety isolation. If the plug
terminals can be touched when the plug is disconnected
from the socket, a means of automatically isolating the plug
from the drive must be used (e.g. a latching relay).
Permanent-magnet motors
Permanent-magnet motors generate electrical power if they
are rotated, even when the supply to the drive is
disconnected. If that happens then the drive will become
energised through its motor terminals. If the motor load is
capable of rotating the motor when the supply is
disconnected, then the motor must be isolated from the drive
before gaining access to any live parts.
WARNING
WARNING
WARNING
WARNING
WARNING
WARNING
NOTE
L1 L2
L2L1 L3 U V W
Optional RFI
filter
Optional
line reactor
Fuses
L3
Mains
Supply
Motor
Optional ground
connection
Supply
r
n
+
_
Thermal
overload
protection
device
Braking
resistor
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