SAM4s SPS-2000 Operator Manual v1.18 Introduction • 11
About Power Conditioning Equipment
Surge Protectors and Power Conditioners
Most people are familiar with surge protectors, which guard against damage due to sudden
spikes in the electrical current. A power conditioner provides protection against surges in
power just as a surge suppressor does, but a power conditioner also maintains a continuous
voltage during temporary voltage reductions, such as a brownout. This is referred to as
conditioning. Power conditioners also can filter EMI emanating from a power source and can
smooth the rhythmic cycle
of alternating current. While surge protectors safeguard equipment,
a power conditioner cleans the signal, eliminating interference on the line.
CRS recommends the PowerVAR ABC065-11 (CRS P/N 701002), a 0.65 amp
power conditioner that is suitable for most ECR applications. POWERVAR
standard power conditioners are for use with any microprocessor based electronic
equipment. Thanks to their low impedance isolation transformer, you can trust
these conditioners to protect your sensitive equipment from the biggest problems for today's
computers.
Ground Guard Conditioners
POS systems consisting of workstations connected in an Ethernet network must have the
same point of reference, (i.e. common ground potential for all equipment in the system.)
Unlike electronic loads, traditional electrical loads such as motors, lights, heavy appliances,
etc. use the equipment ground for safety purposes only and do not rely on it for proper
operation. Computer equipment, on the other hand, introduces the equipment-grounding
conductor as an active part of the power supply in referencing digital logic. Therefore
networked POS systems require isolated/dedicated ground circuits to insure proper operation.
CRS recommends POWERVAR ground guard conditioners for network
applications. Only the “Ground Guard” conditioner from POWERVAR can be
used as an alternative to isolated/dedicated ground circuits. Traditional power
conditioners cannot be used as an alternative as they do not address the ground
issues over a network. The Ground Guard conditioner must protect every piece of equipment
in the POS system in order to operate properly. POWERVAR Ground Guard power
conditioners are available in sizes from 0.65 to 16 amps, to protect single or multiple POS
components.
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