DPI Binder Rev 1.0 Page 1 DIP-PROOFING TECHNOLOGIES INC. Cost comparisons and resulting conclusions between the two above technologies are based on a misunderstanding of the DPI and its intended applications. A dollar per VA comparison should not be made as one is not comparing ‘apples with apples’. By contrasting the different characteristics of the loads which a UPS and the loads a DPI were designed to support, one will realize that these are not competitive, but rather complimentary products. 1. Most interruption problems, whether momentary outages or sags, last less than one second and most facilities and equipment within are able to ride-through these disturbances by virtue of their electrical and mechanical inertia. The Dip-Proofing concept uses this phenomenon by only supporting ultra-sensitive, single phase, control devices (contactors, PLC’s, relays, small power supplies, etc.). Studies and tests by independent contractors and labs have determined that, in most cases, short duration, single phase ride through for the controls is sufficient. Having extended ride-through (‘blackout protection’) with a UPS on the controls serves no purpose and can actually cause damage if the load is held in indefinitely. A timer could be installed with the UPS to limit its ride through, but this is an additional cost item which has to be retrofitted, also at added cost. The DPI already incorporates an adjustable timer. For rare, total blackout protection, a three phase UPS (or DPI) would be required. 2. Reliability is an issue. Installing an on-line UPS adds the risk of taking down the system if it fails which creates the problem you’re trying to solve. This risk increases with less expensive UPS’s. Installing a ‘cheap’ off-line UPS will not necessarily solve the problem as they wait for the zero crossing point before switching on. This can take a few milliseconds and sensitive relays will drop out. The DPI overcomes both the problem of process disruption caused by failure and slow transfer by using an off-line, reliable system but with an ultra-fast transfer (<700uS) which is faster than any control device on the market, that we are aware of. 3. The types of loads requiring support are usually variable. This means that they, either partially or entirely, consists of relays, contactors and/or solenoids which have a high inrush current. UPS’s and CVT’s (Constant Voltage Transformers) cannot handle this inrush unless oversized by at least two to three times. This increases the cost of a suitable UPS or CVT for a particular application dramatically. The DPI is able to withstand inrush currents up to 20 times nominal, and therefore does not need to be oversized. Also some UPS’s do not function well with inductive loads. 4. Long term costs are substantially lower with the DPI as it does not use batteries and therefore there is no maintenance and replacement. This is the ‘cherry on the top’ for most prospects and customers. The DPI also features variable transfer level and a robust, industrial enclosure. DPI, UPS & CVT comparison e c i v e D I P D T V C S P U e v i t c e f f e t s o c & e e r f e c n a n e t n i a M s e Y s e Y o N y t i l i b a i l e r h g i H s e Y s e Y e m o S e m i t r e f s n a r t t s a f a r t l U s e Y A / N o N s d a o l e l b a i r a v r o f e l b a t i u S s e Y o N o N s d n c e s o t s e l c y c m o r f h g u o r h t e d i R s e Y o N s e Y l o r t n o c h g u o r h t e d i r e t a r u c c A s e Y o N o N a s g a s e g a t l o v r o f t r o p p u S d n s e g a t u o y r a t n e m o m s e Y o N s e Y
DPI Binder Rev 1.0 Page 1DIP-PROOFINGTECHNOLOGIES INC.
Cost comparisons and resulting conclusions between the two above
technologiesare based on a misunderstanding of the DPI and its
intended applications. A dollarper VA comparison should not be made
as one is not comparing apples with apples.By contrasting the
different characteristics of the loads which a UPS and the loadsa
DPI were designed to support, one will realize that these are not
competitive, butrather complimentary products.1. Most interruption
problems, whether momentary outages or sags, last less thanone
second and most facilities and equipment within are able to
ride-through thesedisturbances by virtue of their electrical and
mechanical inertia. The Dip-Proofingconcept uses this phenomenon by
only supporting ultra-sensitive, single phase,control devices
(contactors, PLCs, relays, small power supplies, etc.). Studies
andtests by independent contractors and labs have determined that,
in most cases, shortduration, single phase ride through for the
controls is sufficient. Having extendedride-through (blackout
protection) with a UPS on the controls serves no purposeand can
actually cause damage if the load is held in indefinitely. A timer
could beinstalled with the UPS to limit its ride through, but this
is an additional cost item whichhas to be retrofitted, also at
added cost. The DPI already incorporates an adjustabletimer. For
rare, total blackout protection, a three phase UPS (or DPI) would
berequired.2. Reliability is an issue. Installing an on-line UPS
adds the risk of taking down thesystem if it fails which creates
the problem youre trying to solve. This risk increaseswith less
expensive UPSs. Installing a cheap off-line UPS will not
necessarily solvethe problem as they wait for the zero crossing
point before switching on. This can takea few milliseconds and
sensitive relays will drop out. The DPI overcomes both theproblem
of process disruption caused by failure and slow transfer by using
an off-line,reliable system but with an ultra-fast transfer (
