Issue

Using AP9613 Dry Contacts I/O SmartSlot Card simultaneously in the same UPS system as a UPS Network Management Card causes lost communication alarms within the UPS Network Management Card event log.



Product Line

• UPS Management Accessories
  • AP9613 Dry Contacts SmartSlot I/O Card

• UPS Network Management Card 2 (NMC2)
  • AP9630/AP9630CH
  • AP9631/AP9631CH
  • AP9635/35CH

Environment

• All serial numbers
• All firmware versions
• Older UPS designs (including but not limited to Smart-UPS with model SU, SUA, SUM, SURT, SURTA, Symmetra PX 3 phase 40/80, Symmetra LX, Symmetra RM)
• UPS installations with both AP9613 and a UPS Network Management Card communicating with the same UPS

Cause

Due to the way older UPS serial bus designs operate, the AP9613 may prevent a UPS Network Management Card from communicating with the UPS, assuming they are both installed in the same UPS.


Resolution

This is a race condition. AP9613 firmware v2.1.0 has partially addressed this timing problem and a future firmware update for UPS Network Management Card 2 will be evaluated. Until a full fix is implemented, a user may see a UPS: Lost the local network management interface-to-UPS communication. periodically in their UPS Network Management Card log when the AP9613 is also installed. With AP9613 v2.1.0 and higher, this alarm should not remain permanently.

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