18 – 274 HEIDENHAIN Service Manual iTNC 530 HSCI
18.15 Supply voltage for PLC outputs
18.15.1 Introduction
The following components of iTNC 530 HSCI have PLC outputs:
îš„ UEC 11x
îš„ PLB 62xx
îš„ PLD-H 16-08-00
îš„ PLD-H 08-16-00
îš„ MB 620
The PLC outputs are powered by the 24 V control voltage of the machine (in accordance with
VDE 0551).
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 PSL13x is used as 24 V supply unit, this additional smoothing
is not necessary.
EN 61 131-2:1994 permits:
îš„ Minimum absolute value: 20.4 Vdc
 Maximum absolute value: 25.4 V– at 200W 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:
PLB 62xx: Approx. 485 W
UEC 11x: Approx. 48 W
Power output The maximum permissible output of a PLD-H xx-xx-xx is 200 W.
Rated operating
current per output
UEC 11x: 0.150 A
PLD-H: 2 A
Simultaneity with a supply voltage of 25.4 V:
4 outputs with 2 A each
8 outputs with 1 A each
Total current:
Out0 to Out7: ≤ 8 A
Out0 to Out3: ≤ 4 A
Out4 to Out7: ≤ 4 A
For all PLD-H xx-xx-xx units, it must be remembered that a total current of max. 8 amperes per
slot (PLD-H) must not be exceeded! This applies regardless of the number of PLD-H outputs.
HEIDENHAIN recommends the PSL13x as 24 V power supply unit.
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