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6-4
The six main causes of troubles in V690 Series are as follows:
• Influence of installation environment . . . . . . Refer to Section 4-1-1.
• Influence of noise. . . . . . . . . . . . . . . . . . . . . . Take countermeasures against noise.
• External device failure
• Antenna failure
• Link unit failure
• Cable failure
• Tag failure
• Others
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Influence of noise
If an error occurs in an operation of your system, take suitable countermeasures against noise referring to the table below.
••••
Improvement of grounding
••••
Countermeasure against power supply noise
No.
Trouble
Estimated Cause
Countermeasures
1
Trouble caused in large-capacity
motor, transformer, capacitor, etc.
when the power supply turns on.
Instantaneous voltage drop in
power supply system due to inrush
current of large-capacity load.
• Increase the capacity of power supply equip-
ment and of power cable.
Common mode noise due to cause
above.
• Supply the power through 1:1 non-contact
insulation transformer.
• Do not use together with ground to any other
large-capacity load. Perform ground of Class
D (conventional Class III) only.
2
Trouble caused at irregular inter-
vals.
Noise superposed on the power
supply.
• Supply the power through 1:1 non-contact
insulation transformer or noise filter.
• Do not use together with ground to any other
large-capacity load. Perform grounding of
Class D (conventional Class III) only.
Influence of space noise.
• Keep 1 meter or more away from an antenna
if there are PC, AD adapter for PC, switching
power supply, programmable terminal, motor,
proximity switch, etc.
Correct Usage
One meter away from a space noise generating source is a reference value. Depending on a noise generating source,
more than one meter must be away from it. Execute the communication test to check.
Other
device
Antenna
Other
device
Antenna
Grounding of
Class D
Line filter
Twist it. Not to be parallel
with any other power line, etc.
Antenna
6-4 Errors and Countermeasures
. . . . . . . . . . . . . Must be repaired.