Machine cable specification - PH10 systems

For machine cables up to 10 m in length the following specification will be aceptable:

13 cores of 7/0.2 tinned copper wire covered by 0.25 mm PVC. Overall tinned copper braided screen.
PVC outer sheath
Nominal OD 6.9 mm
Core-screen capacitance (nominal) 160 pF/m
Resistance per core 88 milliohms/m

For machine cables between 10 m and 50 m in length, the following conductor sizes are recommended.

Suggested stranding for 22 AWG is 19/0.16 or 26/0.127. This provides a reasonable degree of flexibility.

NOTE:

Limiting factors for long cables are:

Increased cable resistance in motor driven cables reduces maximum torque and speed. Thus for a head rotating with maximum load the time to arrive at position will be approximately 10% longer with 5 ohm conductors.
Increased resistance in the 12 volt reference conductor produces a finite error in calibration. Every ohm above the first ohm will produce a position error of approximately 0.15 µm. Therefore an upper limit of resistance should be 5.0 ohms, ie. positional error of 0.75 µm.
Increased resistance in the locking motor drive conductor reduces speed and max torque. Above 5 ohms the motor could become too slow and eventually fail to reach the top of the cam during a lock cycle.

CMM support