Lenze SCF frequency inverter - Manual (Page 14)

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Lenze 13466146 EDBSF01 v24 EN
3 Installation
3 Installation
3.1 Standard 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 Americas 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 2.4 - 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.
3.1.1 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.