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6 Maintenance and Troubleshooting
NB-series Programmable Terminals Startup Guide Manual(V109)
6-3 Troubleshooting
6
6-3-5 Other Troubles
The interference issue is a rather complicated one, and the commonly used methods for
handling this issue include:
(a) Anti-strong-electricity-interference - Keep weak electricity cables such as
communication cables, signal cables and control cables away from strong electricity,
and do not lay them parallel with strong electricity cables. If possible, wire them through
iron tubes, and if the cable duct is multilayered, lay the weak electricity cables below
the strong electricity ones.
(b) Anti-inner-cabinet-interference - It’s recommended that the alternating current cables
and the direct current cables be laid in separate channels, and if laid in the same
channel, the weak electricity cables and the strong electricity ones need to be bundled
separately, and be kept as far away as possible.
(c) Signal cable anti-interference - Employ STP cables, and ground the shielding layer at
one side or add a magnetic ring.
(d) Anti-inverter-interference - Connect a filter to the power-supply side of the inverter, and
shroud it with a metal casing.
(e) Every equipment needs to be grounded properly.
(f) Use a separate switching power supply for the PT.
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