Lenze SCD Series - Manual (Page 12)

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WARNING!
Severe damage to the drive can result if it is operated after a long period of storage or inactivity
without reforming the DC bus capacitors!
6.0 INSTALLATION
SCD models are suitable for UL pollution degree 2 environment only, and MUST be installed in an
electrical enclosure which will provide complete mechanical protection and will maintain the internal
temperature within the drive’s ambient operating temperature rating. All drive models MUST be
mounted in a vertical position for proper heatsink cooling.
Maintain a minimum spacing around the drive of at least 1 inch on each side and 2 inches on the top
and bottom for units rated up to 5 HP (3.7 kW). For units rated 7.5 - 25 HP (5.5 - 18.5 kW), maintain
at least 2 inches on each side and 4 inches on the top and bottom. Allow more spacing if the drive is
mounted next to other heat-producing equipment. Do not mount drives above other drives or heat
producing equipment. Fans or blowers should be used to insure proper cooling in tight quarters.
In order to properly size an enclosure, the heat generated by the drive(s) must be known. Refer to the
HEAT LOSS columns in Section 5.0 - SCD RATINGS. The STD column is for standard units, and
the THRU column is for through-hole mount units (drives with the through-hole mount option still
generate some heat inside the enclosure that must be taken into account). An enclosure manufacturer
can then determine the required enclosure size based on the total heat generated inside the enclosure
(from the drive(s) and other heat sources), the maximum allowable temperature inside the enclosure,
the maximum ambient temperature outside the enclosure, and the enclosure properties.
The SCD Series is UL approved for solid state motor overload protection. Therefore, a separate
thermal overload relay is not required for single motor applications.
6.1 INSTALLATION AFTER A LONG PERIOD OF STORAGE
If input power has not been applied to the drive for a period of time exceeding three years (due to
storage, etc), the electrolytic DC bus capacitors within the drive can change internally, resulting in
excessive leakage current. This can result in premature failure of the capacitors if the drive is operated
after such a long period of inactivity or storage.
WARNING!
DRIVES MUST NOT BE INSTALLED WHERE SUBJECTED TO ADVERSE ENVIRONMENTAL
CONDITIONS SUCH AS: COMBUSTIBLE, OILY, OR HAZARDOUS VAPORS OR DUST;
EXCESSIVE MOISTURE OR DIRT; VIBRATION; EXCESSIVE AMBIENT TEMPERATURES.
CONSULT AC TECHNOLOGY FOR MORE INFORMATION ON THE SUITABILITY OF A
DRIVE TO A PARTICULAR ENVIRONMENT.
NOTE!
SCD drives are intended for inclusion within other equipment, by professional electrical installers.
They are not intended for stand-alone operation.