Vital relays have been a mainstay for switch machine control in the field. While they have established an enviable history of reliable performance, vital relays require periodic maintenance for this degree of reliability to be achieved. US&S has developed a cost-effective yet equally reliable alternative: The SML-110 High Voltage Solid State Switch Machine Lock and associated PN-150SSR relay. This unit can operate two high voltage switch machines at the same time.
The SML-110 Switch Machine Lock is a vital conditional power supply that provides power to a switch machine. It delivers a nominal 120 Vdc output with a limited current of 23 amps from an ac or dc source when activated by a nominal 12 Vdc input. This output is sufficient to simultaneously drive two switch machines. To deliver an output voltage, the SML-110 requires the presence of two out of three inputs: Switch machine lock and either the normal or the reverse position request. These inputs can be relay contact closures or outputs from an interlocking processor such as the US&S MicroLok ® II or E-Code vital controllers. The II or E-Code vital controllers. The output voltage of the SML -110 is fed as an input to the PN-150SSR Solid State Relay.
The PN-150SSR Relay routes the correct polarity voltage that is required to operate the switch machine to either the normal or the reverse position. In addition to the voltage from the SML-110, PN-150SSR accepts a second input, which is either the normal or the reverse switch request. The input can originate from relay contacts or a vital interlocking processor such as MicroLok II or E-Code.
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