HEIDENHAIN TNC 306 Service Manual - Manual (Page 32)

SERVICE MANUAL TNC 306/360
Page 28
HEIDENHAIN Service
8. Power Supply
8.1 External Power Supply Requirements
The voltages must correspond to the following definitions:
Unit Supply Voltage Voltage Range
D.C. Average Value Max. Current
Consumption Power Consumption
NC 24V
(VDE 0551) lower limit
20.4 V
…
LE 360: 1.2A to 1.5A 28.8W to 36W
LE
PLC
24 V
1.8A
if half of the inputs/
outputs are active
simultaneously approx. 6W
if approx. 1/3 of the
inputs/outputs are active
simultaneously
PL 400 (VDE 0550) upper limit
31 V
… 1)
21A
if half of the inputs/
outputs are active
simultaneously approx. 25W
if approx. 1/3 of the
inputs/outputs are active
simultaneously
BF 110 0.85A with full utilization
of the VDU approx. 20 W
8.1.1 NC Power Supply
The NC-part of the LE must not be connected to the control voltage of the machine tool! It requires its own
external power supply generated separately according to the German Standard VDE 0551:
D.C. voltage of 24 V with a permissible A.C. component (ripple voltage) of max. 1.5 Vpp (recommended
filtering capacitor 10000 µF/40 V-).
8.1.2 PLC Power Supply
The PLC part (PLC inputs and outputs) of the LE and the PL 400 is operated with a control voltage of 24 V (of
the machine tool), generated according to VDE 0550 (German standard).
Superimposed A.C. voltage components, arising from an non-controlled three-phase bridge connection with a
ripple factor of 5% (see German standard DIN 40110/10.75, section 1.2) are permissible. Thus, the highest
absolute value for the upper voltage limit is 32.6 V; the smallest absolute value for the lower voltage limit is
18.5 V.
The 0 V line of the PLC power supply must be
connected to the central signal ground of the
machine tool (ground line
∅
> 6mm²)