HP Performance-Optimized Datacenter, 12 m (40 ft) User Guide

Control panel 33
Armed mode—Pressing a red EPO button on the POD causes the following events:
• The red System Alarm/EPO Shutdown light on the EPO panel illuminates to indicate that an EPO
switch has been activated. (This light remains illuminated until all EPO buttons are restored to their
normal state by means of a key release mechanism, and the Reset button on the EPO panel is
pressed.)
• The EPO activated relay is energized and sends a signal to the EPO panel to energize the
associated control relays.
• The control relays within the EPO panel shut down the affected circuit breakers in the POD.
Test mode—All associated EPO functions are disabled, and the amber System Test Mode light on the EPO
panel is illuminated. This mode enables the EPO buttons to be tested without removing power to the POD.
When an EPO button is pressed, the EPO Activated relay is energized, and it energizes the associated
control relays in the EPO panel. Although the EPO functions are disabled, the horn and strobe alarm are
activated. To silence the alarm, press the Reset button on the EPO panel.
Bypass mode—All EPO functions and test functions are disabled. When the EPO panel is operating in this
mode, the green EPO Bypass light on the EPO panel is illuminated.
Fan control panel
The Fan Control panel houses the relay system that controls the fan speeds within the HP POD, based on
maintaining the cold aisle temperature and aisle differential pressures set through the ECS.
You do not have to access to the Fan Control panel, and no interface setting is required.
Fire alarm control panel
If you connect your central fire alarm system to the fire alarm control panel, any emergency alarm can be
sent directly over your facility alarm system. You must engineer and coordinate fire alarm connections
between the HP POD and any facility alarm systems.
For more information about the fire alarm control panel, see the product documentation included in the
Operations & Maintenance Guide.
House panels
The house panel is a 125A panel board that contains the breakers that provide overcurrent protection to
all auxiliary HP POD components.
• House panel A provides overcurrent protection to all loads.
• House panel B provides backup power to all auxiliary loads, if the primary power fails.
If a breaker is tripped open, you can access the outside of the House panel and reset the breakers. You
can also reset the HP POD components after an EPO alarm. If one or more breakers continually trip,
contact HP ("HP contact information" on page 50).
The standard panel schedule resides inside the panel breaker box and can be referenced when
necessary.