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In the uPA2000 series, when connecting a relay or solenoid valve to the output side, should a surge-absorption diode be attached to both ends of the relay or solenoid valve coil?

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In the uPA2000 series, when connecting a relay or solenoid valve to the output side, should a surge-absorption diode be attached to both ends of the relay or solenoid valve coil?

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A1 As shown in the figure (A), a surge absorbing diode is included in the uPA2000 Series, so that basically no surge absorbing diode is required when connecting a relay or solenoid valve to the output side. However, if surges exceeding the absolute maximum rating for the internal diode are assumed, external connection of a surge absorbing diode with a large loss capacitance is required. Moreover, if no internal diode can be used due to differing power supply voltages as shown in the figure (B), and when driving a pulse motor in which a regenerative current occurs for a long period of time, because an internal diode is used principally for the purpose of spike voltage absorption, an external diode is required.

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