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5.4 Wiring
5.4.1 Precautions for safety devices and wiring
5
SETTINGS AND PROCEDURES BEFORE
OPERATION
2) Precautions for selecting power supply
Power of a light curtain is supplied from power supply connected between
+24V(SAFETY) and 24G(SAFETY) of the main module via the COM terminal
of the extension module. If the current or voltage supplied from the COM
terminal is insufficient, operation of the light curtain cannot be guaranteed.
Select the power supply device which meets the following conditions.
Power supply output voltage : 24 10% [V]
Power supply output current : Main module current consumption (85[mA]) +
(Extension module current consumption (80[mA]) Number of extension
modules) + (Total amount of current consumption of light curtain
*2
) + ((X0
terminal input current (40[mA]) + X1 terminal input current (40[mA]))
Number
of light curtains)[mA] or more
* 2: Control output current is not included. If included, subtract the control output current amount.
[Calculation example]
A calculation example for the system with three extension modules and two
light curtains is shown below.
In the example, current consumption of each light curtain is assumed as
follows.
Current consumption of light curtain A (receiver): 120[mA]
Current consumption of light curtain B (receiver): 210[mA]
Safety relay module specifications
Main module current consumption: 85[mA]
Extension module current consumption: 80[mA]
X0/X1 terminal input current: 40[mA]
Power supply output current[mA] > 85[mA] + (80[mA] 3) + (120[mA] +
210[mA]) + ((40[mA] + 40[mA])
2)
Power supply output current[mA] > 815[mA]
As a result of the calculation, it is concluded that power supply which has
output current 815[mA] or more is required for the system configuration in the
above example.