Yaskawa P7 Metasys N2 - Manual (Page 46)

Troubleshooting – A - 8
Wiring And Cabling
The network cable is the correct type
Table A.4 - Metasys N2 Cable Specifications
Specification Description
Cable Configuration Twisted Shielded Pair
Gauge 18-20 AWG (Solid or Stranded)
Wire Lay Minimum 6 twists per foot
Shields 100% foil with drain wire
NEC Type UL Type CMP
Temperature 60 o C or higher
Cable Lengths Are Within Specified Limits
Cable lengths cannot exceed 500 feet at 9600 baud.
The Network is Terminated Correctly
A bus terminating resistor of 110Ω is available on each drive terminal board and can be applied to the Metasys N2 communication bus by
setting switch S1-1 to the ON position.
In a multi-node system, only those nodes at the end of a bus segment should have terminating resistors. Before applying a terminating
resistor as described above, care should be taken to understand the physical layout of the network and where other resistors might already
be applied. An overloaded or improperly terminated bus may not function properly.
Figure A.2 – Termination Resistor Setting
Table A.5 - Terminating Resistor Switch Setting
Switch Location Function Setting Choices
S1-1 RS-422 and RS-485 Terminating Resistance
OFF: No terminating resistance
ON: Terminating resistance of 110
Ω
Shield Is Continuous And Both Ends Of The Shield Are Grounded
As each drive is daisy-chained to the next, twist together the shields of the adjoining cables. Do not connect the shield at each drive.
The continuous shield should then be single-point grounded at the field panel.
Cable Is Routed Correctly
Route the cable away from all power and high frequency lines. Routing within a separate conduit is preferred.