HEIDENHAIN TNC 335 Technical Manual - Manual (Page 44)

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TNC 360 4 Power Supply 3-15
The NC and the HRA 110 must not be supplied
from the machine control voltage supply! It
requires an individual, external and separately
generated supply voltage according to VDE
0551. Use 24 Vdc with a permissible ac
component of 1.5 Vpp (recommended filter
capacitor 10 000
µ
F/40 Vdc).
24 V
U
t
1.5 V
pp
Danger to internal components!
The internal fuses of the power supply assembly must be exchanged only by
HEIDENHAIN personnel.
If the operating voltage of the control (5V on the processor board) is outside the limit values a
blinking error message "PROCESSOR CHECK ERROR M" is displayed.
4.1.2 PLC power supply
The PLC section (PLC inputs and outputs) of the LE and PL is run from the 24 V machine control voltage
supply, generated according to VDE 0160.
Superimposed ac components, such as those caused by a three-phase bridge rectifier without smoothing,
are permissible up to a ripple factor of 5% (see DIN 40110/10.75, Section 1.2). This means an absolute
upper voltage limit of 32.6 V and an absolute lower voltage limit of 18.5 V.
32.6 V
31 V
20.4 V
18.5 V
U
t