Requirements
to
the
onneting
ables
6.6
T
6.5
Requirements
to
the
onneting
ables
• You must consider IEC/EN 60204-1, chapter 13 at selection of connection cables.
• Use a copper cable for 60°C/75°C in case you consider UL 508 C.
Further information (e.g. maximum allowable length) you will find in «Appendix D - Circuit mains - device»
from page
to «Appendix D - Circuit device - motor» from page
6.6
Protetion
of
the
devie
and
the
able
resp
etively
In order to protect the device or the cables against damage/destruction by the mains, you must install fuses.
Data of the necessary fuses are found in «Appendix D - Fuse protection» from page
Optimal protection could be reached by adding cable protection and device protection.
Cable protection should be designed primarily to protect cable, that means the used cable determines the
protection.
To operate
b maXX® BM3400
devices it is necessary to use cable protection according to «Appendix D - Fuse
protection» from page
If several devices parallely operate at the same mains supply, cable and cable protection have to be selected
to drive the sum of all peak currents of all devices during the possible overload duration. In this case, device
protection has to be set up for each device separately.
At dimensioning of the fuses pay attention to selectivity, that means, select the fuses in a way that errors of
the device or the motor are handled by device protection and errors within the switching cabinet (cables from
cable protection to device protection) lead to activation of the cable protection.
The precharge circuit of
b maXX® BM3400
devices uses resistors to limit current. Devices of housing sizes 0
and 1 are equipped with NTC resistors, devices of housing size 2 use normal resistors for current limiting.
Due to heating of the resistors during precharge - especially at devices of housing size 0 and 1 - resistance
values drop and following the current rises temporarily.
Control of the precharge relay which will be activated, if an adjustable limit (P1242) is exceeded, is based on
measuring the DC link voltage. After activation of the precharge relay only the mains inductivity is effective
for current limiting.
Instrution
Manual
b
maXX®
BM3400
57
Do
ument
No.:
5.07013.03
from
206
Summary of Contents for b maXX BM3400 Series
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