Instruction manual

6 - 28
6 INSPECTION AND MAINTENANCE
(b) Calculate the connecting resistor value R as indicated below.
To satisfy the 0.9 [mA] OFF current of the Motion CPU, the resistor R to be
connected may be the one where 3.1 [mA] or more will flow.
I
R: Iz = Z(Input impedance): R
R 
Iz
I
R
× Z(Input impedance) =
0.9
3.1
× 5.6 × 10
3
= 1625[ ]
R < 1625 [
]
Assuming that resistor R is 1500 [
], the power capacity W of resistor R is:
W = (Input voltage)
2
÷ R = 26.4
2
÷ 1500 = 0.464 [W]
(c) The power capacity of the resistor selected is 3 to 5 times greater than the
actual current consumption. 1.5k [
], 2 to 3 [W] resistor may therefore be
connected to the terminal in question.