HEIDENHAIN TNC 415 (259 9x0) Service Manual - Manual (Page 54)

SERVICE MANUAL TNC 415B/425
Page 51
Issue: 20.08.95
10. Power Supply
10.1 External Power Supply Requirements
The voltages must correspond to the following definitions:
Assembly Power Supply Voltage Range
DC Mean Value Max. Current
Consumption Power Consumption
LE NC 24V - (VDE 0551) lower limit
20.4V
...
upper limit
LE 415/425: 1.5A LE 415/425: approx. 36W
PLC 24V - (VDE 0550)
31V
... 1) 1.8A
if half of the
inputs/outputs are
active simultaneously approx. 6W
if approx. 1/3 of the
inputs/outputs are active
simultaneously
PL 400
PL 410 21A
if half of the
inputs/outputs are
active simultaneously approx. 25W
if approx. 1/3 of the
inputs/outputs are active
simultaneously
PA 110 approx. 100mA approx. 2.9W
1) Voltages up to 36V ... are permissible with t < 100ms.
10.1.1 NC Power Supply
24V 1.5Vpp
t
U
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.
24V DC voltage with a permissible AC component
(ripple voltage) of 1.5Vpp (recommended filtering capacitor
10 000µF/40V - ).
10.1.2 PLC Power Supply
The PLC part (PLC inputs and outputs) of the LE, PL and PA is operated with a control voltage of 24V- of the
machine tool (generated according to VDE 0550).
The installation and connection of the measuring resistors and the analogue inputs (PL 410, PA 110) must be
safe from contact according to VDE 0160 (section 5.5.1).
If this cannot be ensured, PLC and PL 410 (PA 110) have to be powered according to VDE 0551.
Superimposed AC voltage components arising from a non-controlled three-phase bridge connection with a
ripple factor of 5% (see German standard DIN 40110/10.75, section 1.2) are permissible. Thus the highest
absolute value for the upper voltage limit is 32.6V; the smallest value for the lower voltage limit is 18.5V.
32.6 V
31 V
20.4 V
18.5 V
U
t
The 0V line of the PLC power supply must be connected to
the central signal ground (line
∅ ≥
6mm 2 ) of the machine tool.
The ground connector on the PL410 housing must be
connected to the protective ground (line
∅ ≥
6mm 2 ). To avoid
ground loops the measuring voltage at the analogue inputs
must not be grounded.