Thomson Power Systems TSC 900

Questions and Answers

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Rebecca AndersonNov 8, 2025
What to do if Thomson Power Systems TSC 900 Switch will not re-transfer to utility source upon restoration?
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  Cole HamiltonNov 9, 2025
  If the Thomson Power Systems Switch won't re-transfer to the utility source after it's restored, consider these potential causes: * The Utility Return Time delay period in TSC 900 hasn't expired yet, so verify the TSC 900 time delay setting. * A Load Test mode may be active, so check the TSC 900 GHC Home Page status indicators. * An Exercise Test mode could be activated by the TSC 900 scheduler; check the TSC 900 GHC Scheduler page. * The utility supply might not be operating at the correct voltage or frequency levels; verify the nominal levels and compare them to the TSC 900 settings. * The TSC 900 may have incorrect utility voltage or frequency settings; re-program the TSC 900 with the correct settings. * The Utility Phase Rotation might not match the Generator supply; check...
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Matthew SmithNov 18, 2025
Why Thomson Power Systems TSC 900 transfer to generator source without a power failure in the utility source?
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  Kimberly NealNov 18, 2025
  The Thomson Power Systems Switch might transfer to the generator source even without a utility power failure due to several reasons: * A Load Test mode has been activated either locally or remotely. You should check the TSC 900 GHC Home Page status indicators. * An Exercise Test mode has been activated by the TSC 900 scheduler. In this case, check the TSC 900 GHC Scheduler page. * The utility supply is not operating at the correct voltage or frequency levels. Verify the correct nominal levels and compare them to the TSC 900 settings for voltage, phase balance, and frequency. * The TSC 900 has incorrect utility voltage or frequency settings for the ATS. Re-program the TSC 900 with the correct settings. * The utility power switching device has tripped open due to an over current c...
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anthonyperryNov 27, 2025
What to do if Thomson Power Systems Switch will not transfer to generator source upon failure of utility source?
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  Preston YoungNov 27, 2025
  If your Thomson Power Systems Switch fails to transfer to the generator source when the utility source fails, here are some potential causes: * The warm-up time delay function hasn't timed out yet. You should verify the TSC 900 timer setting. * The generator set output circuit breaker feeding the ATS is open. Ensure you close the generator set output circuit breaker. * The generator supply isn't operating at the correct voltage or frequency levels. Check the nominal levels and compare them to the TSC 900 settings for voltage, phase balance, and frequency. * The TSC 900 has incorrect generator voltage or frequency settings for the ATS. Re-program the TSC 900 with the correct settings. * The generator phase rotation may not match the utility supply, especially during the first-tim...