bonitron M3575T, Customer Reference Manual

Page: 27 / 44

User’s Manual
27
6.3.
C
ERTIFICATIONS
Units rated up to and including 75 Amps peak are UL approved. Refer to UL file
number E204386.
6.4.
UL 508A S
HORT
C
IRCUIT
C
URRENT
R
ATING
When braking transistors are used with Underwriters Laboratories listed or recognized
drives, the short circuit current rating (SCCR) is determined by the SCCR rating of the
attached drive.
6.5.
F
USE
S
IZING AND
R
ATING
Some installations may require fuses to be placed in the DC link of the braking system.
In these cases, the following fuses are recommended. Breakers are not
recommended for overcurrent protection.
Table 6-3: Recommended Fuses
230VAC 400VAC 460VAC
M
ODEL
N
UMBER
F
USE
M
ODEL
N
UMBER
F
USE
M
ODEL
N
UMBER
F
USE
M3575T-L15 FWP-15 M3575T-E15 FWP-15 M3575T-H15 FWP-15
M3575T-L30 FWP-30 M3575T-E30 FWP-30 M3575T-H30 FWP-30
M3575T-L60 FWP-60 M3575T-E75 FWP-80 M3575T-H75 FWP-80
M3575T-L125
FWP-125 M3575T-E125 FWP-125 M3575T-H125 FWP-125
M3575T-L150
FWP-150 M3575T-E150 FWP-150 M3575T-H150 FWP-150
M3575T-L200
FWP-200 M3575T-E200 FWP-200 M3575T-H200 FWP-200
M3575T-L300
FWP-300 M3575T-E300 FWP-300 M3575T-H300 FWP-300
M3575T-L600
FWP-600 M3575T-E600 FWP-600 M3575T-H600 FWP-600
6.6.
DC B
US
L
ENGTH
L
IMITS
The distance that the chopper is mounted from the main DC bus filter capacitors within
the drive is limited by the amount of inductance in the connection. During switching,
the inductance in the DC bus between the chopper and capacitors stores energy that
must be absorbed by the snubbing circuit in the chopper.
The values listed in Table 6-4 are the maximum inductance allowed in the DC bus link
to and from the filter capacitors in the drive and the chopper connections.
The separation distance between the two can be increased by using low inductance
buswork or cables, typically this means using buswork or cable with a higher cross
sectional area. The inductance of the buswork can be calculated from the length and
inductance/foot published by the cable manufacturer. There are also standard tables
to help this calculation.