Instrumentation and controls

DOE-SPEC-3021-97

Additional review. If the expected maximum sound level of the equipment

3.4.3

exceeds the specified requirements, provide the following sound level data (both

attenuated and unattenuated) at equipment design point and for at least two

other operating conditions.

a. Maximum sound pressure level measured under "free field" conditions at a

distance of five feet from the outline of equipment shown in decibels on the

"A" scale, at the octave band center frequencies ranging from 31.5 to

8000 Hz.

b. Calculated maximum sound power level of the equipment shown in decibels

at octave band center frequencies ranging from 31.5 to 8000 Hz and referred

to a base of 10-12 W.

3.5.1

Protective and control devices. The UPS system shall be equipped with the

following protective and control devices in addition to those specified in

paragraph 3.3.7:

Transient overvoltage protection. UPS system self-protection

3.5.1.1

against transient overvoltages in dc and ac control and power

circuits. This protection shall be built into the equipment with no

special external connections, configuration of leads or connection of

any external equipment required.

3.5.1.2

Breakers. Three thermal magnetic molded-case circuit breakers

rated for operation in accordance with paragraph 3.2.1; one on the

ac-normal input side of the UPS rectifier, one on the output side of

the UPS inverter, and one in series with the internal bypass source.

Status of all three breakers shall be indicated light on the UPS

control panel.

3.5.1.3

Loss-of-power relays. Loss of power relays (all three phases) for

both ac supply and bypass inputs (internal and external). Actuation

of these relays shall initiate alarm (paragraph 3.3.7)

3.5.1.4

DC low-voltage protection. Inverter protection by the following

adjustable-set-point, low-input voltage circuits:

! DC low-voltage warning (alarm only)

! DC undervoltage trip (alarm and trip action)

3.5.1.5

Overvoltage protection. Overvoltage relay connected across the

rectifier output. Actuation of this relay shall trip the normal internal

dc source if necessary to protect the inverter and shall operate an

alarm device.