HEIDENHAIN TNC 407 (243 020) Service Manual - Manual (Page 39)

HEIDENHAIN
31-O
SERVICE MANUAL TNC
01
Kundendienst
Page 32
8. Power Supply
8.1 External Power Supply Requirements
The voltages must correspond to the following definitions:
Voltages up to 36V
8.1 Power Supply
Max. Current
DC Average Value Consumption
lower limit
Power Consumption
approx. 30 W
20.4 LE 407: 1.3 A
approx. 6 W
if half of the inputs/outputs if approx. of the inputs/
are active simultaneously outputs are active
upper limit 21 A approx. 25 W
V * if half of the inputs/outputs if approx. of the inputs/
are active simultaneously outputs are
simultaneously
with t 100 ms.
U
8.1.2 PLC 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:
24 V DC voltage with a permissible AC component
(ripple voltage) of 1.5 Vpp (recommended filtering
capacitor 10 000 40
The PLC-part (PLC inputs and outputs) of the LE and the PL 400 is operated with a control voltage of 24V
(of the machine tool), generated according to VDE 0550 (German Standard).
Superimposed AC voltage components arising from a non-controlled three-phase bridge connection with a
ripple factor of 5%
German Standard DIN section 1.2) are permissible. Thus, the highest
absolute value for the upper voltage limit is the smallest absolute value for the lower voltage limit
is
The 0 V line of the PLC power supply must be
connected to the central signal ground of the
machine tool (ground line 0 6