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Chapter 9 Options
148
Ch
ap
ter 9
Plurality of double-shielded twisted pair cable
plurality of single-shielded twisted pair cable
Diagram
1
Diagram
2
For low-voltage digital signals, double-shielded cable is the best choice, but can also be a single-
shielded or unshielded twisted pair, as shown in Figure 2, however, the frequency of the signal, it can
only use a shielded cable.
Relay cable need to use cables with metal braid shield.
Need to use a network cable to connect the keyboard, for electromagnetic environment is more
complex place, it is recommended to use shielded cable.
Note: analog and digital signals using different cables routed separately.
3..Interference Countering
Connect noise filter on the output side of inverter can reduce inductive and radio interference.
→Inductive interference: The electromagnetic induction makes the signal line noise when
upload signal ,and then cause the control equipment malfunction.
→ Wireless interference: The high-frequency electromagnet wave emitted by the inverter and
cables will interfere with the nearby wireless device and make it noise when receiving signal.
→ Installation of noise filter as below:
M
MCCB
Inverter
PI500
Noise
Filter
Radio Set
Conduction
interference
Control
equipment
The signal line
AC input
(1)
Inductive interference countermeasure : in addition to the installation of noise filter , it can
also import the output cables to grounded metal tube. The distance between the output cable and
signal line is greater than 30cm , the influence of inductive interference is also significantly
reduced. As shown below :
MCCB
Inverter
PI500
Metal tube
30cm Above
The signal line
Control
equipment
M
AC input
(2)
Radio frequency (RF) interference countermeasure: the input cables, output cables and
inverter itself can produce interference, to install noise filter on both sides of input and output and
shield the inverter with metal box can reduce the radio frequency interference. As shown below :
AC input
MCCB
PI500
Inverter
Noise
Filter
Noise
Filter
Iron box
Iron box
Metal tube
M