HP 354556-002 - Manual (Page 74)

74 HP BladeSystem p-Class Enclosure Installation Guide
IMPORTANT: All power configuration switches in the same zone must
be set to the same position. The system issues alerts and the
management link connector LEDs on the power management modules
flash when these switches are set improperly.
To set the switches for multiple power zones, use the following example and
figure.
Example: A full-rack 42U solution with two pairs of mini bus bars requires two
power zones. To distinguish the two power zones, set all the power configuration
switches on management modules in the upper zone (zone 2) to the up position;
the power configuration switches on the management modules in the lower zone
(zone 1) remain in the down (default) position.