LEESON SM-Plus Series Sub-Micro Inverters - Manual (Page 12)

6.0 INSTALLATION
NOTE: SM-Plus ™ drives are intended for inclusion within other equipment, by professional electrical
installers. They are not intended for stand-alone operation.
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 LEESON ELECTRIC FOR MORE INFORMATION ON THE
SUITABILITY OF A DRIVE TO A PARTICULAR ENVIRONMENT.
SM-Plus ™ 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 drives models MUST be
mounted in a vertical position for proper heatsink cooling.
Maintain a minimum spacing around the drive of at least 1 inch (25mm) on each side and 2 inches
(50mm) 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 (50mm) on each side and 4 inches (100mm) 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 - SM-Plus
™ RATINGS. 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 outside the enclosure, and the enclosure properties.
The SM-Plus ™ 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
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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