Safety
Information
Introduction
Product
information
System
design
Mechanical
installation
Electrical
installation
Getting
started
Optimisation Parameters
Tec h nic a l
data
Component
sizing
Diagnostics
Unidrive SP Regen Installation Guide 65
Issue Number: 2 www.controltechniques.com
6 Electrical Installation
Electric shock risk
The voltages present in the following locations can cause
severe electric shock and may be lethal:
• AC supply cables and connections
• DC connections
• Output cables and connections
• Many internal parts of the drive, and external option units
Unless otherwise indicated, control terminals are single
insulated and must not be touched.
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.
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).
WARNING
WARNING
WARNING
WARNING
To Next Page
Loading...