Appendix
Appendix Appendix
14. Appendix No. Target device Phenomena 3 Telephone (in a common private residence at a distance of 40m) 4 Photoelectric relay When driving a ventilation fan with an inverter, noise entered a telephone in a private residence at a distance of 40m. A high-frequency leakage current from the inverter and motor flowed to grounded part of the telephone cable shield. During the current's return trip, it flowed through a grounded pole transformer, and noise entered the telephone by electrostatic induction. A photoelectric relay malfunctioned when the inverter was operated. [The inverter and motor are installed in the same place (for overhead traveling)] It is considered that induction noise entered the photoelectric relay since the inverter's input power supply line and the photoelectric relay's wiring are in parallel separated by approximately 25mm over a distance of 30 to 40m. Due to conditions of the installation, these lines cannot be separated. Noise prevention measures Notes 1) Connect the ground 1) The effect of the terminals of the motors inductive filter and LC in a common connection. filter may not be Return to the inverter expected because of panel, and insert a 1µF sound frequency capacitor between the component. input terminal of the 2) In the case of a V- inverter and ground. connection power supply transformer in a 200V system, it is necessary to connect capacitors as shown in the following figure, because of different potentials to the ground. 1) As a temporary measure, insert a 0.1µF capacitor between the 0V terminal of the power supply circuit in the detection unit of the overhead photoelectric relay and a frame of the overhead panel. 2) As a permanent measure, move the 24V power supply from the ground to the overhead unit so that signals are sent to the ground side with relay contacts in the ceiling part. 15-9 1) The wiring is separated. (by more than 30cm.) 2) When separation is impossible, signals can be received and sent with dry contacts etc. 3) Do not wire weak-current signal lines and power lines in parallel.
No. Target device Phenomena Noise prevention measures 5 Photoelectric relay 6 Proximity limit switch (electrostatic type) 7 Pressure sensor A photoelectric relay malfunctioned when the inverter was operated. Although the inverter and photoelectric relay are separated by a sufficient distance, since the power supplies share a common connection, it is considered that conduction noise entered through the power supply line into the photoelectric relay. A proximity limit switch malfunctioned. It is considered that the capacitance type proximity limit switch is susceptible to conduction and radiation noise because of its low noise immunity. A pressure sensor malfunctioned. It is considered that the pressure sensor signal malfunction was due to noise that came from the box body and traveled through the shield of the shielded wire. 1) Insert a 0.1µF capacitor between the output common terminal of the amplifier of the photoelectric relay and a frame. 1) Install an LC filter on the output side of the inverter. 2) Install a capacitive filter on the input side of the inverter. 3) Ground the 0 V (common) line of the DC power supply of the proximity limit switch through a capacitor to the box body of the machine. 1) Install an LC filter on the input side of the inverter. 2) Connect the shield of the shielded wire of the pressure sensor to the 0 V line (common) of the pressure sensor, changing the original connection. 15-10 Notes 1) If a weak-current circuit on the malfunctioning side is observed, the countermeasures may be simple and economical. 1) Noise generated in the inverter is reduced. 2) The switch is superseded by a proximity limit switch of superior noise immunity (such as a magnetic type). 1) The shielded parts of shield wire for sensor signals are connected to a common point in the system. 2) Conduction noise from the inverter is reduced.
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14. <strong>Appendix</strong><br />
No. Target device Phenomena<br />
3 Telephone<br />
(in a common<br />
private<br />
residence at<br />
a distance of<br />
40m)<br />
4 Photoelectric<br />
relay<br />
When driving a ventilation<br />
fan with an inverter, noise<br />
entered a telephone in a<br />
private residence at a<br />
distance of 40m.<br />
<br />
A high-frequency leakage<br />
current from the inverter<br />
and motor flowed to<br />
grounded part of the<br />
telephone cable shield.<br />
During the current's return<br />
trip, it flowed through a<br />
grounded pole<br />
transformer, and noise<br />
entered the telephone by<br />
electrostatic induction.<br />
A photoelectric relay<br />
malfunctioned when the<br />
inverter was operated.<br />
[The inverter and motor<br />
are installed in the same<br />
place (for overhead<br />
traveling)]<br />
<br />
It is considered that<br />
induction noise entered<br />
the photoelectric relay<br />
since the inverter's input<br />
power supply line and the<br />
photoelectric relay's wiring<br />
are in parallel separated<br />
by approximately 25mm<br />
over a distance of 30 to<br />
40m. Due to conditions of<br />
the installation, these<br />
lines cannot be<br />
separated.<br />
Noise prevention<br />
measures Notes<br />
1) Connect the ground 1) The effect of the<br />
terminals of the motors inductive filter and LC<br />
in a common connection. filter may not be<br />
Return to the inverter expected because of<br />
panel, and insert a 1µF sound frequency<br />
capacitor between the component.<br />
input terminal of the 2) In the case of a V-<br />
inverter and ground. connection power supply<br />
transformer in a 200V<br />
system, it is necessary to<br />
connect capacitors as<br />
shown in the following<br />
figure, because of<br />
different potentials to the<br />
ground.<br />
1) As a temporary<br />
measure, insert a 0.1µF<br />
capacitor between the<br />
0V terminal of the power<br />
supply circuit in the<br />
detection unit of the<br />
overhead photoelectric<br />
relay and a frame of the<br />
overhead panel.<br />
2) As a permanent<br />
measure, move the 24V<br />
power supply from the<br />
ground to the overhead<br />
unit so that signals are<br />
sent to the ground side<br />
with relay contacts in the<br />
ceiling part.<br />
15-9<br />
1) The wiring is separated.<br />
(by more than 30cm.)<br />
2) When separation is<br />
impossible, signals can<br />
be received and sent<br />
with dry contacts etc.<br />
3) Do not wire weak-current<br />
signal lines and power<br />
lines in parallel.
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