NCR 7870 Checkstand Power and Wiring Considerations, Power Considerations, Power Applications

Chapter 3: Site Preparation 3-9

Checkstand Power and Wiring Considerations

Power Considerations

In the 1000 and 2000 models, the 7870 receives power from an external supply which is normally mounted to the exterior surface of the unit’s chassis. The power supply may be mounted near the 7870 rather than on it, if advantageous.

In the 3000, 4000, and 4500 models, the power supply is mounted on the checkstand.

It is a 40-watt switching power supply with the following inputs.

Voltage	Frequency	Input Power
90 to 260 Vac	47 to 63 Hz	55 Watts

Power Applications

The 7870 has no ON/OFF switch. A recessed, 15 amp circuit breaker must be wired in the checkstand. This circuit breaker must be accessible to the operator so the unit may be powered off and on. It will also be needed to reset the unit during programming.

Power Transients Protection

Voltage transients -- surges, sags, impulses, and spikes – may be experienced routinely or sporadically. When such conditions exist, the use of protective devices may be required to ensure proper operation.