Chapter 3
Signal Connections
© National Instruments Corporation
3-7
ER-8/16 User Manual
Warning: K
EEP AWAY FROM LIVE CIRCUITS
.
DO NOT REMOVE THE TOP COVER
of the
ER-8/16 when it is operating or is powered on. If signal wires are connected to
the ER-8/16, dangerous voltages may exist even when the equipment is turned
off. To avoid dangerous electrical shock, do not perform procedures involving
cover removal unless you are qualified to do so. Before removing the cover make
sure that the computer and the power supply are turned off and that the signal
wires connected to the screw terminals do not contain live voltages.
2. Remove the ER-8/16 top cover by placing a screwdriver in the groove at the bottom of the
ER-8/16 and rotating the screwdriver.
3. Install the contact protection, preferably across the load, if your load is inductive. Refer to
the Contact Protection for Inductive Loads section earlier in this chapter. For additional
information refer to Appendix C, Contact Protection.
4. Connect the wires to the screw terminals.
5. Bundle the wires at the rear end of the ER-8/16 and use a tie-wrap to tie them together.
6. Replace the top cover so that the bundled wires fall within the smaller rectangular hole in the
top cover.
7. Tighten the top cover by fastening the screws to the bottom cover.
Internal Connectors
There are two 26-pin connectors marked IN and OUT on the ER-8/16 PWB. These connectors
are visible when you remove the top cover.
Warning: K
EEP AWAY FROM LIVE CIRCUITS
.
DO NOT REMOVE THE TOP COVER
of the
ER-8/16 when it is operating or is powered on. If signal wires are connected to
the ER-8/16, dangerous voltages may exist even when the equipment is turned
off. To avoid dangerous electrical shock, do not perform procedures involving
cover removal unless you are qualified to do so. Before removing the cover make
sure that the computer and the power supply are turned off and that the signal
wires connected to the screw terminals do not contain live voltages.
The internal connectors expand the switching system to 24 or 32 channels with the minimum
number of cables or accessories. Use the IN connector to interface the ER-8 with the SC-205X
Series cable adapters so you can interface your ER-8 to the Lab or MIO boards.
Warning: If you are using the IN internal connector,
DO NOT
connect a cable to any of the
front connectors.
Connecting the cable to the wrong connector can damage the ER-8/16 or your
DAQ device. National Instruments is
NOT
liable for any damages resulting from
such connections.
