Power supply of the plc-part – HEIDENHAIN TNC 407 (243 020) Service Manual User Manual
Page 47
SERVICE MANUAL TNC
Issue:
01.09.1995
Page
40
8.6 Power Supply of the PLC-Part
The power supply line for the internal PLC is connected to the terminal block X44
can be switched
off, 2
cannot be switched off, 3
The OV line as well as the
(can be switched off) line may
also be connected via connector X41 or X42
PLC Connection Schematic, section
The PLC supply voltages are protected by means of low-voltage fuses on the PLC graphics board
24V can be switched off
low-voltage fuse F2.5 A
24V cannot be switched off
low-voltage fuse F 1 A
The power supply line for the PLC
board PL 400 is connected to the terminal blocks Xl2
Xl3
can
be switched off) and the terminal strip
12
cannot be switched
There is no fuse on the PLC
board (electronic power limiter)
8.5.1 Measuring Points on the PLC Graphics Board
low-voltage fuses