Kollmorgen MMC Smart Drive Series, Hardware Manual

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44 Kollmorgen - June 2014
MMC Smart Drive Hardware Manual
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SYSTEM POWER DEVICES
When using the 230V Smart Drive, the fuse that provides Short Circuit Protection also
provides Over Current Circuit Protection, therefore a separate Short Circuit Protection
fuse is not required.
Two types of fuses are defined for use with the 230V Smart Drive:
Non-restricted - If the Branch Circuit supplying power to the drive is capable of
delivering no more then 5,000 RMS symetrical short circuit amperes (240V
maximum), the fuse type provided for Protection has no “Clearing I
2
t” restrictions, and
must meet the following requirements:
•
have a current rating no greater than the “Maximum Fuse Size” in Table 4-4
•
have an interrupt capability no less than the short circuit rating (Prospective Short-
circuit Symetrical Amperes) of the Branch Circuit supplying the drive.
Restricted - If the Branch Circuit supplying power to the drive is capable of delivering
between 5,000 and 100,000 RMS symetrical short circuit amperes (240V maximum),
the fuse type provided for Protection has “Clearing I
2
t” restrictions, and must meet the
following requirements:
•
meet both of the requirements for a non-restricted fuse (above)
•
be a Class RK1, J, or CC dual element current limiting fuse
The requirements for both restricted and non restricted fuses may be meet by using a
single fuse that meets all requirements. The easiest way to accomplish this is to use a
“Current Limiting Fuse” from
Table 4-4 . These fuses meet all of the requirements for
both Short Circuit Protection and Over Current Protection, and may be used on
Branch Circuits that supply up to 100,000 RMS symetrical short circuit amperes (240V
maximum).
The maximum fuse size allowed for use with each 230V Smart Drive, as well as
suggested Bussmann fuses that meet both the restricted and non-restrictive
requirements as described above, is listed in
Table 4-4 .
UL REQUIREMENTS
• In order to meet UL requirements for the 230V Smart Drive, the over-current
protection device (fuses) must be UL-Listed Class RK1, J, or CC
• Model MMC-SD-3.0-230 must be used with 30 Amp fuses or smaller