MID-7604/7602Power Drive 6 ni.com
•Pollution Degree 2—Normally only nonconductive pollution occurs.
Occasionally,nonconductive pollution becomes conductivebecause of
condensation.
•Pollution Degree 3—Conductivepoll ution or dry,nonconductive
pollution occurs. Nonconductivepollutio n becomes conductive
because of condensation.
Cleanthe device and accessories by brushing off light dust with a soft,
nonmetallic brush. Removeothe rcont aminants with a stiff,nonmetalli c
brush.The unit must be complete ly dry and freefrom co ntaminants before
returning it to service.
You mustin sulate signal connections for the maximum voltage for which
the deviceis rated. Do not exceed the maximum ratings for the device.
Removepower from signal lines before connection to or disconnect ion
fromthe device.
The MID 7604/7602 driveis not a measurement device. However, if you
wantto make a measurement of the circuits or devicesconnected 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
ofthe low-voltage (<1000 V) installation. Examples include electricity
meters,measurements on primary overcurrent protection devices, and
ripple-control units.
•InstallationCategory III—for measurements performed in the building
installation. Examples include measurements on distributionboards,
circuit-breakers,wiring (includin g cables), busbars, junction boxes,
switches, socketo utlets in the fixedinstallation, equipm ent 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-voltageinstallation. Examples include
measurements on household appliances, portable tools, and other
similar equipment.
•Installation Category I—for measurements performed on circuits not
directly connected to mains1.E xamples include measurements on
circuits notd erivedfrom mains, and specially-protected (internal)
mains-derivedcircuits.
1Mainsis defined as the electricity supply system to which the equipment concerned is designed to be connected for either
poweringthe equipment or for measurement purposes.