Connection Of Various Signal - Hitachi PH Instruction Manual

1-28 ● Connection of signals

1.5.3 Connection of various signal

When handling an external signal, be sure to comply with the voltage, current and time
described herein.
We cannot guarantee the operation unless it is handled correctly.
1.5.3-1 Ready output signal
The following describes the wiring of the signal that is outputted to the outside for the
purpose of indicating that the IJ printer is ready state.
(To prevent a print target from traveling without being printed, this signal is used, for
instance, to stop the conveyor when the IJ printer cannot perform printing.)
When this signal is connected, set the ready output switch to 3.
(See Section 1.5.4, Using the Ready Output Selector Switch).
(a) When using the NO contact (make contact)
Power relay
To conveyor
(b) When using the NC contact (break contact)
Power relay
To conveyor
For both the NO and NC contacts, the maximum capacity is 30 VAC/0.5 A or 30 VDC
/ 1 A. If any load having a greater capacity is used, furnish a separate relay in
between.
Further, if a motor, relay, or other inductive load is employed, a counterelectromotive
force may be generated to reduce the useful contact life. Therefore, be sure to provide
contact protection.
Typical contact protection methods are indicated below.
Applicable to CR system (AC, DC)
1
The suggested values for capacitor C and resistor R are as follows.
C: 0.5 to 1μF, no polarity
R: 0.5 to 1 Ωper 1 V
The withstanding voltages of the capacitor and resistor must be at least two times as
high as the employed voltage.
TB2
1 NC
2 NO
3 COM
Power supply
TB2
1 NC
2 NO
3 COM
Power supply
1
2
R
C
3
2-3 contact
Ready state
Other than above
1-3 contact
Ready state
Other than above
TB2
Closed
Open
Open
Closed