Mitsubishi Q62DAN Manual de usuario descargar pdf (Pagina 127)

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MELSEC-Q

11 I/O MODULE TROUBLESHOOTING

Table 11.2 Output Circuit Problems and Corrective Actions (Continued)

Condition Cause Corrective Action

Example 3

The load is

not turned

OFF. (Triac

output)

• The load current is lower than the minimum

load current.

Triac

Surge suppresso

Phototriac

QY22

Control

circuit

Load

• When the load current is lower than the

minimum load current of the output module,

the triac does not operate, causing the load

current to flow into a phototriac as shown

above.

If an inductive load is connected in this state,

the load may not be turned OFF since surge

at the time of OFF is applied to the phototriac.

• Connect a resistor to both ends of a load so

that the load current is higher than the

minimum load current.

Load

Resistor

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Mitsubishi Q62DAN Manual de usuario Pagina 127