Plc Power Supply - HEIDENHAIN TNC 426 PB/M Technical Manual

3.4.4 PLC Power Supply

Power
consumption
Nominal operating
current per output
X44: PLC supply
voltage
December 2001
The PLC of the LE 426 CB/PB/M and LE 430 CA/PA/M logic units as well as
the PL 410B/PL 405B are powered by the 24 Vdc control voltage of the
machine (in accordance with VDE 0551).
The control voltage must be smoothed with a minimum 1000 µF at a rated
current capacity of 150 µF/A. At a current load of e.g. 15 A, this corresponds
to a capacity of 2250 µF.
EN 61 131-2:1994 permits the following values:
n
5% alternating component
n
Minimum absolute value 19.2 Vdc
n
Maximum absolute value 30 Vdc
Warning
Use only original replacement fuses.
If half of the outputs are switched at the same time, the following are the
values for power consumption:
PL 410B: approx. 460 W
PL 405B: approx. 235 W
LE: 0.125 A (with a simultaneity factor of 0.5)
PL 410B: 2 A (with max. current consumption of 20 A)
PL 405B: 2 A (with max. current consumption of 20 A)
Pin layout of the logic unit:
Terminal Assignment
1 +24 V cannot be switched off
via EMERGENCY STOP
2 +24 V can be switched off via
EMERGENCY STOP
3
4 0 V
If you are using the TNC as a programming station, the PLC power supply
must be connected to terminals 1 and 2.
Power Supply
PLC outputs
O24 to O30 control is ready
O16 to O23
O0 to O15
3 – 27