Sam4POS Operators Manual v2.33 Introduction • 13
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 Sam4POS 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.
Uninterruptible Power Supplies (UPS)
On sites where there is a known problem with temporary power outages or brownouts, battery back-up devices
should be installed. Most battery back-up devices are known as Uninterruptible Power Supplies (UPS). When
power to equipment is momentarily lost, the UPS devices draw power from an internal ‘gel cell’ battery to keep the
equipment operating. The length of time these devices power the POS system is dependent on the capacity of the
internal batteries. Many sizes are available, but typically the units installed on POS equipment keep the computers
powered for about 20 minutes. This will give servers and managers time to settle bills, print checks and power
down the system in an orderly fashion.
CRS recommends POWERVAR Security One Series Uninterruptible Power Supplies, the most
advanced, line-interactive, true sine wave UPM products available for your application. Each
model is designed to provide total protection for your system from a complete range of power
quality problems. Security One Series Uninterruptible Power Supplies are available with or
without the patented Ground Guard conditioning circuitry.
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