Mitsubishi Q62DAN Manual de usuario descargar pdf (Pagina 125)

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MELSEC-Q

11 I/O MODULE TROUBLESHOOTING

Connecting a switch with LED display, in which a maximum 2.33mA leakage current

flows when 24VDC is supplied to the QX40.

QX40

Input module

Leakage

current 2.33mA

24VDC

(1) In this case, the circuit does not satisfy the condition that the off current of the QX40

is 1.7mA or less.

Connect a resistance as follows.

QX40

Iz=1.7mA

0.63mA

24VDC

2.33mA

5.6K

Input impedance

(2) In order to satisfy the condition that the OFF current of the QX40 is 1.7mA or less,

the resistance R, in which a 0.63mA or more current flows, shall be connected.

Calculating with the formula,

: I

Z (Input impedance): R

R Z (Input impedance) = 5.6=15.11[k ]

0.63

1.7

the resistance R will be R<15.11k

Consequently, if the resistance R is set to 12k

, the electric power W of the

resistance R will be calculated in the following formula,

W= (Input voltage)

/R=28.8

/12000=0.069[W].

(3) Since the resistance requires the electric power which is 3 to 5 times of the power

actually consumed, the resistance to be connected to the corresponding terminal

shall be 12.0k

and 1/4 to 1[W].

(4) The OFF voltage of the QX40 when the resistance R calculated above is connected

will be 8.90[V]

12.0[k ] 5.6[k ]

2.33[mA]=8.90[V]

This also satisfies the condition that the OFF voltage of the QX40 is 11V or less.

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Mitsubishi Q62DAN Manual de usuario Pagina 125

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