Chapter 5 Wiring
Wiring consideration
5-12
4.3 Output terminal wiring consideration:
4.3.1 Surge current from Indicator load:
When the incandescent lamp is turned on, there will be a surge current 10~20 times larger than
normal value lasting some 10ms. It is recommended to add a shunt resistor or a bleeding resistor to
reduce that surge.
A shunt resistor
There will remain current to supply for indicator
in OFF condition, therefore, the resistance
should be carefully determined.
Current limiting resistor
The brightness of the lamp will be reduced if the
resistance is too large.
4.3.2 Surge voltage of inductive load
When inductive load is ON/OFF transited, there will be a surge voltage KV. Particularly, relay
output module has no standard surge absorber, so it might be seriously affected by such surge
voltage. Please refer to following directions regarding surge absorbing for different circuit.
As for AC power supply type, please apply a CR
surge absorber.
As for DC power supply type, please apply a
flying-wheel diode surge absorber.
Applying single capacitor to absorb surge may seriously damage relay terminals! (Please do not
apply that).
C
Load
Power
supply
The charging current of capacitor in OFF condition is too large, so the terminal might be melt. While
short circuit current of capacitor in ON condition, the terminal also might be melt out.
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