Lenze EMB934x - Manual (Page 105)

Electrical installation
Important notes
Fuses and cable cross−sections
5
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105 EDBMB9340 DE/EN/FR 12.0
5.1.7 Fuses and cable cross−sections
ƒ The data of the fuses and cable cross−sections mentioned in these Operating
Instructions are recommendations and refer to the use
– in control cabinets and machines
– installation in the cable duct
– max. ambient temperature +40 °C.
ƒ When selecting the cable cross−section, please consider the voltage drop under load.
ƒ Protection of the cables on the AC side (L1, L2, L3):
– By normal fuses.
– Fuses in UL−conform systems must have UL approval.
– The rated voltages of the fuses must be dimensioned according to the mains
voltage of the application.
ƒ Protection of the regenerative power supply on the DC side (+UG, −UG) by means of
the recommended DC fuses.
ƒ When connecting a braking for safety shutdown:
– The fuses and cross−sections mentioned in these Operating Instructions do not
apply to braking units. The data can be obtained from the documentations of the
braking units.
ƒ The compliance with further standards (e.g.: VDE 0113, VDE 0289 and others) is the
responsibility of the user.
5.1.8 Mains synchronisation
The regenerative power supply module can either be operated with internal or with
external mains synchronisation.
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Note!
In the Lenze setting, the internal synchronisation is activated to make the
regenerative power supply module compatible with earlier hardware versions.
The external synchronisation is recommended for the following reasons:
ƒ A mains failure is detected safely and quickly.
ƒ No mains error message due to mains filter effects on the mains
synchronisation.
If you use the external mains synchronisation, observe the following
ƒ 3−phase wiring of the connections L1.2, L2.2, L3.2
ƒ In−phase connection of the three mains phases
L1
W L1.2
L2 W L2.2
L3
W L3.2