NASA temporarily suspended all Mars operations
Washington: NASA engineers have temporarily suspended all science operations by Mars rover Curiosity after the six-wheeled robot developed an electrical issue.
“The vehicle is safe and stable, fully capable of operating in its present condition, but we are taking the precaution of investigating what may be a soft short,” said Mars Science Laboratory Project Manager Jim Erickson at NASA’s Jet Propulsion Laboratory, Pasadena, California.
A “soft” short is a leak through something that’s partially conductive of electricity, rather than a hard short such as one electrical wire contacting another.
The rover’s electrical system is designed with the flexibility to work properly throughout that range and more – a design feature called “floating bus.”
A soft short can cause such a voltage change. Curiosity had already experienced one soft short on landing day in August 2012. That one was related to explosive-release devices used for deployments shortly before and after the landing.
It lowered the bus-to-chassis voltage from about 16 volts to about 11 volts but has not affected subsequent rover operations.
Soft shorts reduce the level of robustness for tolerating other shorts in the future, and they can indicate a possible problem in whichever component is the site of the short.
Operations planned for Curiosity for the next few days are designed to check some of the possible root causes for the voltage change.
Analysis so far has determined that the change appeared intermittently three times during the hours before it became persistent.
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