HP 40cp User Manual download pdf (Page 38)

Power management 38

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.

EPMS panel

The electric power managing system (EPMS) is composed of 120V, Nema 515R rated auxiliary power.

The panel optionally provides additional power for auxiliary components, mainly the BMS.

• If you connect land power to this panel, the BMS is powered by external land power.

• If you do not connect land power to this panel, the BMS is powered by the House panel.

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 set through the BMS.

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.

For more information about the fire alarm control panel, see the product documentation included in the

Operations & Maintenance Guide.

House panel

The House panel is a 120A panel board that provides power and electrical requirements to all auxiliary

HP POD components.

If a breaker is tripped open, you can access to 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 55).

The standard panel schedule resides inside the panel breaker box and can be referenced when

necessary.

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HP 40cp User Manual Page 38