Kern-sohn VFS 2T1 Addendum Manual do Utilizador descarregar pdf (Página 10)

EPM205 - Technical reference - Rev. A Page 10

Advanced Printing Systems

3.6. Heating time calculation

The following formula allows to calculate the heating time T

depending on driving voltage VH:

comavicl

(N *

)

Where:

is the nominal energy

is the driving voltage

is the average resistance

N is the number of dots energized simultaneously

com

is the common resistance (0.05 )

is the driver saturated resistance (10 )

is the lead resistance (10 )

3.7. Thermistor

When performing continuous printing, it is recommended that the supply energy be reduced so that the

substrate temperature monitored through the thermistor will remain below 65°C.

The thermistor specification is the following:

- R25, resistance at 25°C: 30 K ±5%

- B value: 3950 K ±2%

- Operating temperature: -20°C to +80°C

- Time constant: Max. 30 s (in the air)

Then the resistance value, R, versus temperature, T (in °C), is given by the formula:

R ( T ) = R 25 *

B*(

T + 273

25 + 273

)

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Kern-sohn VFS 2T1 Addendum Manual do Utilizador Página 10