DR' LIGHT PL SERIES

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DR. LIGHT PL SERIES
A Green World is Lit up
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Two major problems in night time lighting
But with traditional methods they can only
serve as partial solutions.
Problem 1. Decreasing of Industrial and
commercial activity due to - Over-voltage effect
(8pm to 8am)

• Problem 2. Reduction of Street life
  boulevards, parks, airports, motorways

Is it necessary to have lamps working at 100
nominal voltage throughout the night?
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The answer is Simply NO!
Because PL provides you here is a TOTAL SOLUTION
with its 1. Operation principles voltage
stabilisation dimming 2. Comparative analysis
with traditional methods 3. Unique technologies
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The answer is Simply NO!

• Example voltage reduction of 20 ? V2 V1 x 0.8
• P2 V22/ R (V1 x 0.8)2 / R P1 x 0.64
• CONSEQUENCE
• By reducing the operating voltage by just 20,
  the energy
• savings obtainable is 36

Through PL, these two major problems in public
lighting can be easily ruled out, with
considerable saving available.
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Operation Principles Voltage Stabilization
Dimming
1. Stabilizer topologies Electronic
direct Electronic with booster 2. 3xAVR in
one Independent phase regulation Independent
by-pass per phase
Topologies An idea that locked inside PL System
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Operation Principles Voltage Stabilization
Dimming
A working cycle of PL
Vn

• t0 to t1 soft start from 200V (can preset)
• t1 to t2 soft ramp up to 220V (can be preset)
• t2 to t3 nominal voltage
• t3 to t4 Saving order.
• Soft transition down to saving level (VSAP o VM)
• t4 to t5 dimmed voltage.
• t5 to t6 Back to nominal order
• Soft transition up to nominal level

220V
200V
VM
VSAP
t
t4
t3
t2
t1
t0
t7
t6
t5

• The global stabilization of the complete
  installation enhances the life of the lamps,
  Over-voltages and under-voltages are
  automatically and permanently compensated both
  during nominal-level operation and saving-level
  operation

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Comparative analysis with traditional methods
Dimmer-stabiliser PL Innovations 1. Perfect
Stabilisation (both working in nominal and saving
level) 2. Single source system easy to install,
cheaper to maintain 3. Up to 40 Power Saving,
soft transitions, controlled by micro processor
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Different technologies comparison
1. 2-output transformer Dimmers 1.1 Based on
just one 2-output transformer - No
stabilization, only dimming Lamps turn off
unexpectedly if voltage drops Again partial
solution
2. Servo-motor Dimmers/Stabilisers 2.1 Based on
one motorised variable transformer 2.2 Wide
variety of moving elements motors, belts,
brushes - Expensive maintenance 2.3 Stabilisation
speed much lower than in pure electronic
equipment Over-voltages ? Lamps life decreases
Under-voltages ? Lamps turn off unexpectedly
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Different technologies comparison
3. Purely electronic direct Dimmers 3.1 No input
transformer Electronic components directly
affected by surges 3.2 Based on triacs direct
tapping Weakness against overloads
4. Electronic Static multi-tap Dimmers A
standard PL system 4.1 Based on multi-tap
transformer static switches column 4.2 No
moving elements No maintenance 4.3 Ultra-fast
Stabilisation response (?40ms) Lamps voltage
always stable 4.4 Static by-pass per phase, and
independent phase regulation Management of 100
unbalanced loads
A mature selection for lighting network, whenever
wherever!
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Product Overview
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Special Version - PL (Junior) Series
Comparison

• Both PL PL (Junior) are voltage regulating
  products and capacity is measured by
• apparent power (kVA). But PL (Junior) is step
  change in voltage regulation instead of
• gradual change and in connection with RS232
  Computer.
• Besides, there are a few other differences
  between these two systems as follows
• Regulation margin
• PL 12 grades, 6.5V each grade. Voltage
  reduction is up to 58V, while increment is 20V.
• PL Junior 4 grades 220V, 202V, 196V and 190V

A brilliant thinking - powertechnic in action
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Special Version - PL (Junior) Series
2. Voltage adjustment PL - Each phase is
adjusted independently. Phase imbalance is 100
allowable. PL Junior Three phase are adjusted
together. Phase imbalance is 30 allowable. 3.
Time of Changing Saving Levels PL uses thyristors
to change saving level within 1 ms while PL
Junior uses contactors to change within
100ms. 4. Bypass PL Automatic solid state
incorporated and separated independently by
phase. PL Junior Tri-phase automatic solid
state incorporated.
A eco button - a press away to simply save energy.
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Special Version - PL (Junior) Series
Product Overview
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POWERTECHNIC (HONG KONG) LIMITED 11/F, Mau Lam
Commercial Building, 16-18 Mau Lam Street Jordan,
Kowloon, Hong Kong Tel [phone] Fax (852)
2342 1077 www.powertechnic.com Dr. Light is a
registered trademark of Powertechnic HK Ltd