DS8000 Service Documentation Version 7.5

MAP2640 Emergency Power Off Warning (EPOW) error reported to PPS

A rack power system EPOW error can have additional FRUs than are listed in the serviceable event FRU list.

MAP2640 Section-1

An unexpected EPOW signal has been detected by one or more storage enclosure FCIC cards:
- A valid EPOW signal can only be sent by the PPS or fan sense card to the storage enclosure FCIC cards.
- An invalid EPOW signal detected by the PPS can be caused by the FRUs in the serviceable event FRU list
- In some cases, for additional low probability FRUs listed later in this procedure.
Have you replaced all hardware FRUs listed in the serviceable event that sent you here and it still fails?
- Yes, go to the next step.
- No, replace the hardware FRUs and return to this step if it is still failing.

Reference the first column in Table 1. Find the row that lists the same FRUs that are listed in the serviceable event that sent you here.

Table 1. EPOW error reporting
FRUs listed in the serviceable event FRU list	Error description of what appears to be reporting the EPOW error	Additional possible failing FRUs if FRUs in FRU list do not fix the problem
Fan sense card MAP2640¹	FCIC cards in at least two storage enclosures in the front of the rack or FCIC cards in at least two storage enclosures in the rear of the rack	PPS
PPS MAP2640¹	One or more FCIC cards in the front of the rack and One or more FCIC cards in the rear of the rack	None, contact your next level of support
Fan sense card FCIC card MAP2640¹	Only one FCIC card in the rack is reporting	Replace one or more of the following FRUs until the problem is fixed. Single path from a fan sense card to a storage enclosure FCIC card, which is a: Cable from the fan sense card to the bulkhead connector Bulkhead (lowest probability FRU) Cable from the bulkhead to the rear of the storage enclosure Storage enclosure backplane
Fan sense card FCIC card (location P1-C1) FCIC card (location P1-C2) MAP2640¹	Both FCIC cards in one storage enclosure in the rack	Replace one or more of the following FRUs until the problem is fixed. Refer to Figure 1 for the signal path from the fan sense card to the storage enclosure FCIC card, which is a: Cable from the fan sense card to the bulkhead connector Bulkhead (lowest probability FRU) Cable from the bulkhead to the rear of the storage enclosure Storage enclosure backplane

Note: ¹ MAP2640 is not included in the FRU list on LIC bundle VRMF of 64.2.xx.xx or earlier.

Figure 1. EPOW signal path from FCIC Card to PPS