Siemens S7-300 - Page 328

Switching capacitive and inductive loads
Fail-safe signal modules
328 Installation and Operating Manual, 01/2010, A5E00085586-10
Remedy:
1. Determine the load current and the capacitance of the load.
2. Determine the operating point in the diagram above.
3. If the operating point lies above the curve, you must do one of the following:
– Increase the load current by connecting a resistor in parallel until the new operating
point is below the curve
– Use the output with series diode
Switching behavior SM 326; F-DO 10 x DC 24V/2A PP
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① 0.1 Hz ④ 1 Hz ⑦ 10 Hz
② 0.2 Hz ⑤ 2 Hz ⑧ 20 Hz
③ 0.5 Hz ⑥ 5 Hz ⑨ 30 Hz
Figure E-2 Max. permitted inductive load depending on load current and switching frequency