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LOAD CONDITIONER UNIT
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a new concept in power protection
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The Next Generation of Intelligent Protection
Designed and developed specifically for the
protection of electronic components, the LCU is
at the forefront of Cut-Out technology.
The LCU will provide the additional protection
and filtering required by the majority of
electronic lamp control devices.
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Electronic Technology
Street Lighting is entering an exciting new
generation of electronic technology, that offers
un-paralleled flexibility and efficiencies. Our
product has been developed specifically for the
demands of this new market.
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The Power Supply

• Electricity consists of a single phase or three
  phase waveform ( normally a sine wave with
  little if any distortion ) characterised by
• VOLTAGE
• CURRENT
• FREQUENCY
• SYMMETRY (only for three phase supplies)

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Power Supply Problems

• From the source to the connected loads, the sine
  wave can be polluted with various types of
  electrical disturbance
• SPIKES and ELECTRICAL NOISE
• SAGS and BROWNOUTS
• FREQUENCY FLUCTUATIONS
• VOLTAGE HARMONICS
• MOMENTARY INTERRUPTIONS and MAINS FAILURES
• TRANSIENT VOLTAGES

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Power Supply Problems
These disturbances are caused by a variety of
sources including failures and switching problems
within the electrical transmission and
distribution system, extreme weather conditions
and the operation of heavy industrial and / or
faulty hardware. Mains interruptions are the
only immediate evident disturbances.
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Power Supply Problems
Spikes, transients, sags and brownouts are far
more common and can stress the power supplies
within street lighting and communication
applications to the point where hardware damage,
data processing errors and costly downtime
result. Harmonics can also cause unexpected
heating damage to electronic switching.
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Effects of Power Supply Problems on Equipment
The increasing interconnectivity and complexity
of many street lighting installations , and their
requirements to operate reliably, dramatically
raises the demand for the correct power solution
to be implemented. Power disturbances can
result in productivity losses, product quality
deterioration, health safety risks, and may
undermine the service itself.
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Effects of Power Supply Problems on Equipment
Electronic products data processing systems
within critical environments must be protected to
avoid hardware damage, data processing errors and
sudden system failures.
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The Tofco Load Conditioner

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Protected
Out of Action
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The Load Conditioner should be your first Line
of Defence
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It will take the burden off, cables,
connections, contactors and the mains supply
transformer when a large number of Public
Lights are switched-on simultaneously.
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Protection

• Protection for
• Electronic Monitoring Systems.
• Protection for
• Electronic Ballast Devices.
• Protection for
• Electronic Communication Systems.
• Protection for
• Electronic Timers.

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Protection

• Protection for Ignitors.
• One major street lighting contractor
• found that 37 of their call-outs were due to
  premature failure of ignitors.

Failure caused by mains transients.
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Function

• Minimises Power Up Surges

• Provides Overload Short Circuit Protection

• Protection from Mains Transients Lightning

• Attenuation of the Higher Emissions Bands

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Minimises Power Up Surges

• Public Lighting loads contain capacitance.
  This capacitance will contain inrush currents at
  power up.

• Its intensity depends exactly on the position of
  switch-on within the mains cycle.

• The LCU protects your equipment from this
  problem by providing a SOFT START control.

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Example of surge current without protection
The above diagram demonstrates surge current in
a Public Lighting Load when it switches on close
to the mains cycle peak.
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THE SWITCH-ON ALWAYS TAKES PLACE AT THE MAINS
CYCLE ZERO POINT WHEN THE LOAD CONDITIONER IS
INSTALLED.
IT RANDOMISES THE SWITCH- ON TIMES.
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Example of surge current with protection
The Load Conditioner Unit reduces the surge
current to its minimum level.
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The randomisation function is implemented by
programming a pseudo random number into each unit
at manufacture.
The delay times are fixed within each unit. THIS
GREATLY REDUCES UNITS ENGAGING SIMULTANEOUSLY.
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• Overload Short Circuit

• If the Load Conditioner detects a load current
  exceeding 10 amps it will switch off the load
  within fifty micro seconds.

• If there is a short circuit the LCU will shut
  down the load within one micro second.

• In both cases, the load will be reapplied 2
  seconds later. If the fault is still detected the
  LCU will automatically shut-down.

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As long as the surge current is less than 30 amps
then the Load Conditioner will not interrupt it.
This allows power factor correction capacitors
up to 300 Micro Farads to be used without
tripping the Load Conditioner.
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Mains Transients Lightning

• Varistor controlled protection
• between -
• Mains live and earth
• Mains neutral and earth
• Mains live and mains neutral

CLAMPS ALL TRANSIENT VOLTAGE SPIKES
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Attenuation of the higher emissions bands

• The Tofco Load Conditioner attenuates all
  emissions in the region of 0.5MHz upwards.

• This should ensure Emissions Compliancy (EN55015
  note 1) in Public Lighting Installations, that
  employ a number of Electronic Ballasts and
  Monitoring Systems.

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Benefits

• Full protection of electronic products

• Compact design

• Additional protection for fuses MCBs

• Lamps protected to help
• achieve their optimum life

• Reduction in maintenance costs

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LCU Physical size 1 x 17.5 mm DIN module
Fitted with 3 x PCBs
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The Tofco Load Conditioner
Din rail mounted module
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Typical LCU Application
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The Load Conditioner is inserted between the
mains supply and the load as shown in the diagram
below.
100w 100w 100w
150w 150w
400w
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The Tofco Load Conditioner
Fuse holder mounted module
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The Tofco Load Conditioner
Specifications Mechanical Size 1 x 17.5mm DIN
module Weight 85 gram Electrical Power loss at
230Vac and 0.85 load efficiency Rated
load Loss 70 W 0.7 W 100 W 0.8 W 150 W 1.0
W 250 W 1.8 W
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The Tofco Load Conditioner
Specifications Electrical Input Voltage
range 180V to 260Vrms Current limit output
before cut-off 30A (fast rising) Current limit
duration before cut-off 1uS Output cut-off
current 5A (slow rising) Input surge current
limit 30A with randomized switch-on
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The Tofco Load Conditioner
Specifications Electrical Maximum load
capacitance 300uF The LCU will activate the
cut-off at power-up if the load capacitance is
higher. Max input transient current 10A LCU
transient protection will maintain the transient
voltage below the 720V breakdown value for
transient currents up to 10A.
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The Tofco Load Conditioner
Specifications Standards Conducted
emissions EN55015 (note 1) Immunity EN61547
(note 1) Safety EN60598 (note 1) Mains
Distortion EN61000 2-3 Class A (note1 and
2) Note 1 While the LCU on its own will be
designed to comply with the above the overall
system may not due to the non-compliance of other
components such as the ballast, communications
units or control devices. The overall system
needs to be tested for compliance
separately. Note2 While the LCU on is own meets
EN61000-2-3 class A, it is possible for the
overall lighting system to meet class C as the
LCU distortion component is small.
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REVIEW

• Full protection of electronic products

• Compact design

• Additional protection for fuses MCBs

• Reduction in maintenance costs

• Lamps protected to help
• achieve their optimum life

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Contact - Tofco Ltd
Meadowfield Ind. Est. Ponteland Northumberl
and ENGLAND UK NE20 9SDTel 44 (0)
1661 860001Fax [phone]e-mail
info_at_tofco.co.uk
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