OnLine Power Constant Power 3 - Manual (Page 8)

OnLine Power
6002-034 REV. C 1-1
SECTION 1 - OPERATION
1-1 INTRODUCTION
This manual provides installation, operating and maintenance information for the Constant Power 6, the Constant
Power 3, and the Mini-Power voltage regulator units. A detailed description of each product is provided in the
following subsections.
All components used are of the highest quality and specifically selected to achieve the highest level of
performance. These units are UL listed and conform to the National Electric Code (NEC) and Occupational
Safety and Health Act (OSHA) standards.
The Constant Power 6, Constant Power 3 and the Mini-Power are tapped electronic voltage regulators. The
Constant Power 6 has six taps on the primary winding of the transformer. The Constant Power 3 and Mini-Power
have three taps on the primary winding of the transformer. Each tap is controlled by a silicon controlled rectifier
(SCR) switch can become active at any time. Input line-to-line voltage and line current are monitored. Peak
voltage is compared with a desired reference. Depending on this comparison, the regulation logic activates the
proper SCR switch when the phase current becomes zero. This changes the primary-to-secondary turns ratio
which corrects the output voltage to the desired nominal. The correction process starts in less than one cycle.
See Illustration 1-1.
REGULATED SYSTEM RESPONSE
ILLUSTRATION 1-1
SAG
CORRECTED
IN 1 CYCLE
SURGE
CORRECTED
IN 1 CYCLE
CONSTANT POWER 6:
REGULATED TO +/- 3% OF NOMINAL TY PICAL
CONSTANT POWER 3 AND MINI-POWER:
REGULATED TO +/- 5% OF NOMINAL TY PICAL
SAG
SURGE
120
-120
0
120
-120
0
INPUT
OUTPUT