Mitsubishi Q62DAN Bedienungsanleitung PDF herunterladen (Seite 129)

11 - 7 11 - 7

MELSEC-Q

11 I/O MODULE TROUBLESHOOTING

Table 11.2 Output Circuit Problems and Corrective Actions (Continued)

Condition Cause Corrective Action

Example 5

The load

which was

turned OFF

is turned ON

for a moment

at power-off.

(Transistor

output)

The load [2] which was turned OFF may be turned ON

due to back electromotive force at the time of power-

off [1] if an inductive load is used.

Load

OFF

[2]

COM

12/24VDC

Output module,

ombined module

Source output

Back electromotive

force

[3]

[1]

Shut off

[3]

Back electromotive

force

Output module,

ombined module

Sink output

[1]

Shut off

Take action in the following (1) or (2).

(1) To prevent the generation of the back

electromotive force, connect diode in parallel with

load where the back electromotive force has been

generated.

Source output

[3]

Load

Back electromotive

force

Sink output

[3]

Back electromotive

force

Load

(2) Install a diode between the positive and negative

external power supply to allow an electric current

to pass another current path.

When the corrective action shown in the example

4 is taken simultaneously, the diode must be

installed in parallel with the C1 and R1.

Load

Source output

Load

OFF

[2]

[3]

COM

Back electromotive

force

[1]

Shut off

Example 4

* The measures are ineffective in the following

modules due to the characteristic of the external

power supply circuit

• QY81P

Load

Sink output

Load

OFF

[2]

[3]

COM

12/24VDC

Example 4

Back electromotive

force

[1]

Shut off

D1: Reverse voltage VR(VRM)

*1,

Forward current IF(IFM)

*1 Approximately 10times higher than the rated

voltage in the specifications

Example: 24 VDC

Approximately 200V

*2 More than twice as much as the maximum load

current (common) in the specifications

Example: 2A/1 common

4A or more

1 2 ... 124 125 126 127 128 129 130 131 132 133 134 ... 143 144

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