Mounting And Operating Conditions - HEIDENHAIN TNC 410 M Technical Manual

4 Mounting and Operating Conditions

4.1 Check List
4 – 2
Anyone connecting a machine with a HEIDENHAIN inverter system has to
ensure the following:
Establish a direct connection of the HEIDENHAIN inverter system only to TN
networks with grounded and loadable star point.
In TN-C networks, the neutral lead and grounding conductor are combined
in one conductor in the entire system (PEN). In TN-S networks, the neutral
lead and the grounding conductor are routed separately from each other and
are connected via ground (page 4 – 6, page 4 – 32).
The network is symmetrical (230 Vac or 3 x 400 V ± 10 %) and complies with
the network quality criteria as per EN 50160.
HEIDENHAIN inverter systems can be operated properly only in
symmetrical networks with a voltage asymmetry of 3 % maximum.
If the HEIDENHAIN inverter system is connected via an isolating
transformer, a grounded and loadable star point is necessary on the
secondary side (page 4 – 8).
If an isolating transformer is used, it must be dimensioned sufficiently
(page 4 – 8). If additional loads are connected, they must be considered
when dimensioning the isolating transformer.
When connecting a neutral lead, ensure that the cross section of the neutral
lead is large enough (at least 10 mm²).
When connecting the grounding conductor, ensure that the cross section of
the grounding conductor is large enough (at least 10 mm²).
Only use Siemens Sitor gR or Siba gRL semiconductor fuses as line fuses.
The size of the line fuse depends on the inverter used (page 5 – 42, page 5
– 42, page 5 – 48).
If fuses other than those described in the Manual are used, this can cause
damage to the inverter system in the event of an error.
Warning
See also the information under "General" on page 4 – 3 and the following
pages.
HEIDENHAIN Technical Manual for Inverter Systems and Motors