TROUBLE-SHOOTING
Table A. Trouble Shooting the ATS Annunciator
| Problem | Probable Cause | Corrective Action |
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1. | Normal and Emergency | No communication made. | Recheck wiring; check for |
| lights flash alternately on all | Incorrect, broken, or shorted | shorted or open circuits. |
| ATS Annunciators. | wiring between ATSs and | Be sure correct twisted pairs |
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| ATS Annunciators. | are connected. |
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2. | Normal and Emergency | No communication made. | Recheck address settings in |
| lights flash alternately on | Addresses on ATSs do not | ATS Annunciator and ATS |
| only one Annunciator. | correspond to addresses on | Control Panels. They must |
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| ATS Annunciator. | be the same. |
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3. | Normal and Emergency | Communication lost to that | Check power and |
| lights flash for only one ATS | ATS due to no power to ATS | communication lines at all |
| column (not alternately) | location. | ATSs. |
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4. | Normal and Emergency | Communication lost due to | Check power and |
| lights flash for all ATS | power failure at all ATSs, or | communication lines at all |
| columns (not alternately) | broken or shorted | ATSs. |
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| communication line. |
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5. | When Transfer Test is | Key switch on Master ATS | Insert key and turn it to |
| pressed amber light does | Annunciator in Lock position. | Unlock position. |
| not flash. |
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6. | When Time Delay Bypass is | Key switch on Master ATS | Insert key and turn it to |
| pressed amber light does | Annunciator in Lock position. | Unlock position. |
| not go off. | Key switch was turned to |
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| Lock before test completed. |
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If corrections do not resolve the problem, call your local ASCO Power
Technologies or Authorized Representative Office, or ASI. Furnish the
Serial No. and Catalog No. from the transfer switch nameplate.
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