Maintenance Instructions
Currency Singularity
NCR 5635 Spray Currency Dispenser Service Manual
4-27
NCR - CONFIDENTIAL AND PROPRIETARY
Use pursuant to Company Instructions
Currency Singularity
4
Singularity
4
The term “singularity” describes the parameters used by the
dispenser to recognize a single currency bill. In the 5635 dispenser
the LVDT determines whether a picked currency item is single by
measuring the cross sectional area of the item. This measurement is
compared with a threshold value held in NVRAM to determine
whether a bill is single, multiple, folded, or torn. Invalid bills are
detected and rejected. Threshold values are stored for each currency
type.
For proper operation of the dispenser, the singularity thresholds
must be configured correctly as described in this section.
Internal
Compensation
Factor
4
The dispenser maintains an internal compensation factor in
NVRAM on the dispenser control board. This compensation factor
allows for differences that exist between the singularities calculated
by different LVDT assemblies because of mechanical tolerances. The
dispenser adjusts the LVDT compensation factor automatically as
currency items of a known singularity value are dispensed. While
items are dispensed the actual average of good single item
singularities is measured over 255 bills.
Condition of
Currency
4
It is important that the currency dispensed to establish singularity is
new. Used currency could result in a singularity threshold lower
than a value which new currency can give.
The singularity thresholds must be established for each type of
currency to be dispensed. Different denominations of currency
notes must not be mixed in a single cassette. Also different issues of
a denomination may have different physical parameters and they
must not be mixed if the dimensions are different.
To calibrate the dispenser it is recommended to dispense around
2000 items of currency of a known singularity (test notes). The
currency should be prepared as described in Chapter 3.
master.bk Page 27 Wednesday, March 27, 2002 9:35 AM
