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Unidrive M702 User Guide 21
Issue Number: 3
3.2.6 Electromagnetic compatibility
Variable speed drives are powerful electronic circuits which can cause electromagnetic interference if not installed correctly with careful attention to
the layout of the wiring.
Some simple routine precautions can prevent disturbance to typical industrial control equipment.
If it is necessary to meet strict emission limits, or if it is known that electromagnetically sensitive equipment is located nearby, then full precautions
must be observed. In-built into the drive, is an internal EMC filter, which reduces emissions under certain conditions. If these conditions are exceeded,
then the use of an external EMC filter may be required at the drive inputs, which must be located very close to the drives. Space must be made
available for the filters and allowance made for carefully segregated wiring. Both levels of precautions are covered in section 4.12 EMC
(Electromagnetic compatibility) on page 68.
3.2.7 Hazardous areas
The drive must not be located in a classified hazardous area unless it is installed in an approved enclosure and the installation is certified.
3.3 Terminal cover removal
Isolation device
The AC and / or DC power 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 and / or DC power supply has been
disconnected. If the drive has been energized, the power 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 authorized distributor.
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