Kern-sohn VFS 2T1 Addendum Manual de usuario descargar pdf (Pagina 14)

EPM205 - Technical reference - Rev. A Page 14

Advanced Printing Systems

4.2. Paper feed speed versus voltage

The following table gives the maximum paper feed speed versus the stepper motor voltage and duty cycle

for the stepper motor driving.

EPM205-LV/HS

Motor voltage

(V)

Paper feed speed

(mm/s)

Duty cycle

(%)

2.7 23 100

3 35 100

3.3 37 100

3.6 40 100

4 47 100

4.5 50 80

5 56 60

5.5 59 50

6 62 40

6.5 68 35

7 72 30

7.5 80 25

8 85 20

8.5 90 15

Notes:

· To avoid overheating the stepper motor, it is strongly advised to respect the on/off duty cycle as

indicated above (when performing continuos printing and/or paper feeding).

· The maximum period for the ON time is 30 seconds (when the duty cycle is not 100%).

· The Duty cycle depends only on motor voltage, so, for instance: at 6V, the paper feed speed can be less

than 62mm/s, but the duty cycle remains 40%.

To compute the off Time, apply the following formula:

onTime

DutyCycle

onTime

offTime -=

Example : supposing an on Time of 15s, at 6 V, from the table we obtain a duty cycle value of 40%, so:

soffTime 5.2215

100

On the above example, if the EPM205 works consecutively for 15 seconds, it must rest for 22.5s to allow

the motor to cool down.

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Kern-sohn VFS 2T1 Addendum Manual de usuario Pagina 14