July 2013 3.12 Power supply for PLC outputs 265
3.12 Power supply for PLC outputs
The PLC outputs of the PLB 62xx are powered by the 24 V control voltage of
the machine (PELV in accordance with EN 61800-5-1). The power to the PLC
outputs is supplied via the corresponding terminals on the respective I/O
module connectors for PLC outputs.
The control voltage must be smoothed with a capacitance of 150 µF per amp
of rated current, and in any case with at least 1000 µF. At a current load of 15
A, for example, this corresponds to a capacitance of 2250 µF. If the PSL 130
is used as 24 V– supply unit, this additional smoothing is not necessary.
EN 61 131-2:1994 permits:
Minimum absolute value: 20.4 V–
Maximum absolute value: 25.4 V– at 200 W power output
Maximum absolute value: 28.8 V– at 100 W power output
Power
consumption
If half of the outputs are switched at the same time, the following are the
values for power consumption:
PL 6xxx: approx. 485 W
UxC 11x: 48 W
Power output The maximum permissible power output of a PLD-H xx-xx-xx is 200 W.
HEIDENHAIN recommends the PSL 130 (575047-01) as 24 V power supply
unit, see "PSL 13x low-voltage power supply unit" on page 237.
Use only original replacement fuses.
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