SF01U 11
6.0 INSTALLATION
NOTE
SCF Series drives are intended for inclusion within other equipment, by
professional electrical installers according to EN 61000-3-2. They are not
intended for stand-alone operation
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 Lenze
AC Tech for more information on the suitability of a drive to a particular
environment.
SCF 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 (25 mm) on each side and
2 inches (50 mm) on the top and bottom for units rated up to 5 HP (3.7 kW). For units rated
7.5 - 30 HP (5.5 - 22 kW), maintain at least 2 inches (50 mm) on each side and 4 inches (100
mm) 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 - SCF 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 SCF 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
STOP!
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!
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.
In order to reform the capacitors and prepare the drive for operation after a long period of
inactivity, apply input power to the drive for 8 hours prior to actually operating the motor.
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