Difference between PS and SPS is faulted ?

Hi,

We get the following errors from Unisphere for a CX4-240 SAN.

We would like to know what is the difference of PS and SPS fault.

My understanding is SPSA is faulted.  What does the other 2 PS error means ?

PS (Enclosure SPE Power B1) is faulted.

PS (Enclosure SPE Power A1) is faulted.

SPS (Enclosure SPE SPS A) is faulted.

Error code for first 2 errors is 0x7402

Error code for the third error is 0x7404

Thanks

Message was edited by: TonyJK