When connecting the machine to a power supply with a
grounded outer conductor, an isolating transformer must be used.
For IT and TT networks, as well as for asymmetrical mains sup-
plies (one phase grounded, corner-grounded delta network), the
machine must be connected via an isolating transformer by the
customer
Power supply configuration:
■
A mains supply in star connection and with a grounded star
point (Solidly Grounded Wye) is required.
■
If the existing mains supply is in delta connection (Corner
Grounded Delta), the customer must install a grounded iso-
lating transformer in star connection (with grounded star
point) (see NEC item 450-5).
Grounding:
■
The machine and power distributor system must be equip-
ped with a grounding line in accordance with NEC article
250, "Grounding".
■
For details on grounding power distributor systems and
industrial plants, refer to the NEC standards or consult an
electrician or the power station.
IT system
A surge diverter is required if the machine is connected to an IT
system.
TRUMPF recommends surge diverters from the following manu-
facturers:
■
Phoenix Contact GmbH & Co. KG, Flachsmarktstrasse 8,
32825 Blomberg, Germany e-mail: [email protected].
■
Dehn+Söhne, PO Box No. 1640, D-92306 Neumarkt, E-mail:
[email protected].
Isolating transformer
Depending on the machine and on the power supply at the
installation site, the voltages can be adjusted in the electrical
cabinet at the 3-phase power supply (= EP.EM +CB1 –T2) for
3x 360 V, 3x 380 V, 3x 400 V, 3x 420 V, 3x 440 V, 3x 460 V,
3x 480 V, 3x 500 V and 3x 520 V.
For the special case of 3x230 V, an external isolating trans-
former which transforms the voltage to 3x400 V is provided.
2
‐
14
Electrics - Version 1
B1161en
NEC conditions
Содержание TruBend 2000 Series
Страница 74: ...2 46 Electrical connection Version 1 B1161en...
