NEC NP-PH3501QL - Page 135

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7. Appendix
Circuit diagram
Shorting wire 1
Shorting wire 2
Interlock connector Inside projector
390Ω/0.5Wresistor
390Ω/0.5Wresistor
GND
4
3
2
1
1A fuse
VCC +5V
Photocoupler
Connector no. PhotocouplerON/OFF Description
1 — +5V supply
2 ON/OFF Connects to the photocoupler anode inside the projector
3 Connects to the photocoupler cathode inside the projector
4 — Ground
When the length of the wiring is less than 5 m (approximate)
Remove shorting wire 1 or shorting wire 2 and connect the external contacts (switch) to the projector interlock terminal
(1 and 2 or 3 and 4) by cable.
• The projector operates normally when the contacts are closed and the system shuts off when the contacts are open.
• A power supply external from the projector is not necessary.
• A maximum of 2 sets of external contacts can be connected. If you are only using a single set of external contacts,
connecting the shorting wire to the interlock terminal you are not using.
• The minimum rating required of the external contacts is 2mA.
When the length of the wiring is at least 5 m (approximate)
Remove shorting wire 1 and shorting wire 2 and connect the external device to the projector interlock terminals (2
and 3) (do not use 1 and 4).
• Connect terminal 2 to the positive side of the external device and connect terminal 3 to the negative side.
• The projector operates normally when a voltage in the range of DC5 to 16V is applied between terminals 2 and 3,
and the system shuts off when the voltage is 0V.
• The minimum rated current required of the external device varies depending on the voltage applied between the
terminals by the external device.
• When feeding the cable out from the projector, feed it so that it passes through the hole on the side face of the
projector.
Pull the cable through here.