Operational Notes; Power On/Off Note - Star MP212FP-24-A Specification And Operating Instructions

8. OPERATIONAL NOTES
8.1 Power ON\OFF Note
If the 5V power supply line for logic has not fully risen or fallen immediately after the power supply
is turned ON or OFF, the CPU or TTL in the logic circuit may misoperate. At such times, power
is supplied to the motor or solenoid, causing, in the worst case, burnt out solenoid or running of
motor (misoperation), unless the 24V power supply line for motor drive is completely OFF. To avoid
such misoperation, take into account the following points.
8.1.1
Power supply ON/OFF timing
rule
Supply 24V line after the 5V line has fully risen. Similarly, cut off the 5V line after the 24V line
has fully fallen.
+5V line
(For logiccircuits)
+24V line
(For printercircuits)
—
Fig. 8-1
8.1.2 Method of controlling
Power supply ON/OFF timing rule
the
drive circuit
+5V line
(For logiccircuits)
+24V line
(For printercircuits)
Reset Reset
// / / / / / , ' Reset cancel
Drive circuit
/
Fig. 8-2 Drive circuit controlling method
If the power supply ON/OFF timing rule cannot be followed, reset the print solenoid or motor drive
circuit with control signal. An example of this type of circuit is shown in Fig. 8-3. Turn OFF
transistor TR1, while the 5V line has not completely risen, in order to inhibit power to the print
solenoid. Then as soon as the 5V line has completely risen, turn ON TR1, permitting power to the
print solenoid.
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