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MID-7604/7602 Power Drive 6 ni.com
• Pollution Degree 2—Normally only nonconductive pollution occurs.
Occasionally, nonconductivepollution becomes conductivebecause of
condensation.
• Pollution Degree 3—Conductive pollution or dry, nonconductive
pollution occurs. Nonconductive pollution becomes conductive
because of condensation.
Clean the device and accessories by brushing off light dust with a soft,
nonmetallic brush. Remove other contaminants with a stiff, nonmetallic
brush. The unit must be completely dry and free from contaminants before
returning it to service.
Yo u must insulate signal connections for the maximum voltage for which
the device is rated. Do not exceed the maximum ratings for the device.
Remove power from signal lines before connection to or disconnection
from the device.
The MID 7604/7602 drive is not a measurement device. However, if you
want to make a measurement of the circuits or devices connected to the
drive, operate the device only at or below the installation category stated in
the specifications. Installation categories are listed below.
• Installation Category IV—for measurements performed at the source
of the low-voltage(<1000 V) installation. Examples include electricity
meters, measurements on primary overcurrent protection devices, and
ripple-control units.
• Installation Category III—for measurements performed inthe building
installation. Examples include measurements on distribution boards,
circuit-breakers, wiring (including cables), bus bars, junction boxes,
switches, socket outlets in the fixed installation, equipment for
industrial use, and some other types of equipment, such as stationary
motors permanently connected to the fixed installation.
• Installation Category II—for measurements performed on circuits
directly connected to the low-voltage installation. Examples include
measurements on household appliances, portable tools, and other
similar equipment.
• Installation Category I—for measurements performed on circuits not
directly connected to mains
1
. Examples include measurements on
circuits not derived from mains, and specially-protected (internal)
mains-derived circuits.
1
Mains is defined as the electricity supply system to which the equipment concerned is designed to be connected for either
powering the equipment or for measurement purposes.