Click here to make tpub.com your Home Page

Page Title: Rectifier/Charger
Back | Up | Next

Click here for thousands of PDF manuals

Google


Web
www.tpub.com

Home

   
Information Categories
.... Administration
Advancement
Aerographer
Automotive
Aviation
Construction
Diving
Draftsman
Engineering
Electronics
Food and Cooking
Logistics
Math
Medical
Music
Nuclear Fundamentals
Photography
Religion
   
   

 



DOE-SPEC-3021-97
3.3.3
Rectifier/Charger.
3.3.3.1
Controls. The rectifier/charger shall include the following
adjustments and controls:
ATTENTION:
Enter the amount of float voltage adjustment and equalization voltage adjustment required. A 2% adjustment
should be the minimum specified with 3% being high enough to accommodate almost any battery and battery
room temperature condition.
********************
]% of nominal
Float Voltage Adjustment:
[
Equalization Voltage
Adjustment:
[
]% of nominal
Walk-In Controls:
60 seconds to full load
Equalization Charge Timer:
Adjustable from 0 to 72 hours
ATTENTION:
Silicon control rectifiers are the most common type. They are usually three-phase input with 6, 12, or 24 pulses of
current per cycle output. The 6-pulse type is the most common. The 12- and 24-pulse types offer better input
power factor and line-voltage distortion but are more complex in design. They also tend to be used on large UPS
systems. Check with UPS manufacturers based on the specified UPS kVA rating to determine which pulse type
rectifier is best suited for the application.
********************
3.3.3.2
Type. The internal dc source rectifier/charger for the UPS system
shall be of the [6] [12] [24]-pulse silicon-controlled rectifier type, for
operation from Owner's normal ac source. The output of the
rectifier shall be the current required to supply the UPS system
inverter and supply the charging requirements of the UPS system
battery. The rectifier output shall be self-regulating and maintain the
output voltage constant within the input source variations described
in paragraph 3.2.1.
Load limiting. The rectifier/charger shall be equipped with a
3.3.3.3
completely automatic load-limiting feature which prevents the output
from exceeding its maximum safe rating. In the event of failure of
the load-limiting feature, backup protection shall be provided to trip
the unit.
3.3.3.4
Harmonic reduction. The rectifier shall be a full-wave controlled
type using silicon controlled rectifiers (SCRs) in both the positive
and negative legs to reduce even-ordered harmonics. The total
harmonic distortion (THD) of current drawn by the UPS shall not
exceed 5%.
Output voltage. The rectifier/charger normal output voltage shall be
3.3.3.5
adjustable and shall be set to the battery manufacturer's
14


Privacy Statement - Press Release - Copyright Information. - Contact Us

Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business