HEIDENHAIN iTNC 530 HSCI - Power supply; Supply voltages in the HSCI system

18 – 244 HEIDENHAIN Service Manual iTNC 530 HSCI
Powered
components
The following components / functional groups are powered with +24 V NC:
 MC 62xx main computer unit
 IPC industrial computer
 BF2xx TFT visual display unit
 MB 6xx machine operating panel
 TE 6xx keyboard unit
 HSCI component (bus module and logic) of PLB 6xxx and PLB in UxC
The following components / functional groups are powered with +24 V PLC:
 PLB 6xxx input/output module
 PLD-H digital plug-in module for PLB
 PLA-H analog plug-in module for PLB
 Motor holding brakes
 PLC sensors and actors
 PLC component (PLC input/output assemblies) of PLB 6xxx and PLB in UxC
The CC 6xxx controller unit is powered via the X69 supply bus of the HEIDENHAIN supply module
and X74 (+5 V).
When using
a UEC
Functional ground
and protective
ground
Total current consumption of all HSCI
components
Power supply by...
< 3.5 A 24 V power supply unit of UEC 11x (connector X90)
> 3.5 A PSL 130
Grounding Functional ground (signal ground) Protective ground
Character B PE
Task Functional equipotential bonding Protective equipotential bonding
Connected
devices
The signal-ground connections (B) of
the HEIDENHAIN control components
must be connected to the central
functional ground of the machine.
The same is true for 0 V of the NC
supply voltage.
All protective-ground connections of the
HEIDENHAIN control components must
be connected to the central protective
ground (PE) of the machine.
The same is true for 0 V of the PLC
supply voltage.
Minimum
diameter
6 mm
2
6 mm
2
Connection The central signal ground and the central protective ground must be connected
with each other once for the machine!
Note
The machine tool builder defined the line cross section of the +24 V NC power supply
for the power consumption of the connected devices. The protection was defined from the line
cross section according to EN 60204-1.
The cross section of the +24 V NC supply line must be at least 0.75 mm²!
Note
The motor brakes are controlled by 24 V PLC voltage. The trigger circuit and the brake itself are
usually separated from the line power only by basic insulation according to EN 618100-5-1 (also
EN50178). Also, other add-on devices that are controlled by PLC circuits usually have only basic
insulation from the line power.