Lenze MC1000 Series - Manual (Page 22)

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If it is necessary to drill or cut the drive enclosure or panel, extreme care must be
taken to avoid damaging drive components or contaminating the drive with metal
fragments (which cause shorting of electrical circuits). Cover drive components
with a clean cloth to keep out metal chips and other debris. Use a vacuum cleaner
to clean drive components after drilling, even if chips do not appear to be present.
Do not attempt to use positive air pressure to blow chips out of drive, as this tends
to lodge debris under electronic components. Contaminating the drive with metal
chips can cause drive failure and will void the warranty. The MC1000 Series is UL
approved for solid state motor overload protection. Therefore, a separate thermal
overload relay is not required for single motor applications. In applications where
one drive is operating more than one motor, a separate thermal overload relay is
required for each motor per NEC.
7.1 INSTALLATION AFTER A 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 drive/motor system.
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."