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8 Commander SK Size 2 to 6 Getting Started Guide
www.controltechniques.com Issue Number: 2
1.10.2 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.
1.10.3 STOP function
The STOP function does not remove dangerous voltages from the drive,
the motor or any external option units.
1.10.4 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.
1.10.5 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).
1.10.6 Ground leakage current
The drive is supplied with an internal EMC filter capacitor fitted. If the
input voltage to the drive is supplied through an ELCB or RCD, these
may trip due to the ground leakage current. See section 4.4.2 Internal
EMC filter on page 33 for further information and how to disconnect the
internal EMC capacitor.
1.11 Mechanical installation
1.11.1 Lifting the drive
The weights of the model sizes 4, 5 and 6 are as follows:
Size 4: 30kg (66Ibs)
Size 5: 55kg (121Ibs)
Size 6: 75kg (165Ibs)
Use appropriate safeguards when lifting these models.
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