Kollmorgen MMC Smart Drive Series, Hardware Manual

Page: 49 / 386

Kollmorgen - June 2014 47
MMC Smart Drive Hardware Manual
-
SYSTEM POWER DEVICES
•
Use an Over Current Protection fuse that has a current rating not greater than
the “Maximum Fuse Size” shown in
Table 4-5 , and an interrupt capability not
less than the short circuit rating (Prospective Short-circuit Symetrical
Amperes) of the Branch Circuit supplying the drive.
•
Use a Short circuit Protection fuse (typically a semiconductor fuse) that has a
“Clearing I
2
t” rating not greater than that shown in Table 4-5 , and a current rat-
ing greater than the Over Current Protection fuse (to avoid nuisance tripping).
See Table 4-6 on page 50 to for a listing of available fuses and fuse holders from
Kollmorgen..
UL REQUIREMENTS
In order to meet UL requirements, UL-Listed High Speed Class J (HSJ) semi-
conductor fuses (like those listed in
Table 4-5 ) must be used for Branch cir-
cuit Protection of the 460V Smart Drive.