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(b) Case 2
Case
Cause
• The load current is lower than the minimum load current of the output module.
• In such a case, the load current flows into a phototriac as shown above because the triac does not operate. If an inductive load is
connected with the load current flowing into a phototriac, the load may not turn off because the surge at the time of off is applied to the
phototriac.
Action
• Connect a resistor across the load so that the load current is equal to or higher than the minimum load current.
Triac
Surge suppressor
Phototriac
Control
circuit
Load
TRIAC output module
Load
Resistor