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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.