HEIDENHAIN TNC 410 M Technical Manual page 246

4 – 38
Warning
HEIDENHAIN generally recommends connecting the litz wires for the 5-V
supply to terminal X74. If you want to use the ribbon cable anyway, the
following constraints apply:
The ribbon cable may be subjected to a maximum load of 10 A.
The line drop along the ribbon cable must be less than 100 mV.
The ribbon cable has 10 litz wires each with a cross section of 0.14 mm
This results in a total cross section of 1.4 mm
Example 1 of using the ribbon cable for the +5-V supply:
Components used
MC 422B (single-processor without position
inputs)
CC 424 (6 control loops)
6 x ERN (speed)
4 x LC (absolute linear encoders)
2 x RCN (absolute angle encoders)
This results in a current consumption > 10 A. The ribbon cable alone does not
suffice for the +5-V supply. In addition, the litz wires must be used for
supplying the power of +5 V.
Example 2 of using the ribbon cable for the +5-V supply:
Components used
MC 422B (single-processor without position
inputs)
CC 424 (6 control loops)
6 x ERN (speed)
4 x LS (incremental linear encoders)
2 x RON (incremental angle encoders)
This results in a current consumption < 10 A. This means that the ribbon cable
alone suffices for the +5 V supply. However, the maximum permissible line
drop of 100 mV must also be taken into account.
HEIDENHAIN Technical Manual for Inverter Systems and Motors
2
.
Current consumption
4.7 A
2.5 A
6 x 0.2 A = 1.2 A
4 x 0.3 A = 1.2 A
2 x 0.35 A = 0.7 A
Total: 10.3 A
Current consumption
4.7 A
2.5 A
6 x 0.2 A = 1.2 A
4 x 0.15 A = 0.6 A
2 x 0.2 A = 0.4 A
Total: 9.4 A
2
.