Lenze MCH Series - Manual (Page 25)

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7.1 INSTALLATION AFTER LONG PERIOD OF STORAGE
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!
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.
7.2 EXPLOSION PROOF APPLICATIONS
Explosion proof motors that are not rated for inverter use lose their certification when
used for variable speed. Due to the many areas of liability that may be encountered
when dealing with these applications, the following statement of policy applies:
“Lenze AC Tech Corporation inverter products are sold with no warranty of fitness for a
particular purpose or warranty of suitability for use with explosion proof motors. Lenze
AC Tech Corporation accepts no responsibility for any direct, incidental or consequential
loss, cost, or damage that may arise through the use of its AC inverter products in these
applications. The purchaser expressly agrees to assume all risk of any loss, cost or
damage that may arise from such application.”