July 2013 3.8 Supply voltages in the HSCI system 235
X74: +5 V power
supply for CC
Maximum wire cross section: 2.5 mm
2
If the system includes several CCs 61xx that are connected to the same
supply bus (X69) via a UV supply module, it is usually sufficient to connect only
the last CC 61xx (usually the unit at the extreme right) to the UV via X74. The
other CC 61xx units are then supplied via supply bus X69.
If several CC 61xx units are supplied by more than one UV supply module,
which means that they are connected to different supply bus systems (X69),
then the last CC 61xx (usually the unit at the extreme right) of the respective
supply bus must also be supplied with the additional + 5 V of the UV via X74.
If the +5 V power supply to the CC 61xx is too low, the error message Self-
test cannot be started appears after the control has booted. In this case,
please open the bus diagnosis on your control to display more detailed
information on the cause of the error:
Press the MOD key
Press the DIAGNOSIS soft key.
Press the BUS DIAGNOSIS soft key.
If the error was caused by too low a supply voltage, the error (PF.BOARD)
Error in the supply voltage is displayed for the affected CC controller unit(s)
in the bus diagnosis. In these cases, check the wiring of the power supply at
X74 and contact your HEIDENHAIN service agency.
Connecting terminal
at X74
Assignment
1 +5 V NC from the UV supply module (X74)
20V
The +5 V NC supply via X74 from the supply module is mandatory for the
CC 61xx!
The interface is electrically separated (protective extra-low voltage (PELV)
as per EN 61800-5-1).
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