Chapter 4
SSR Series Modules
SC-2311 User Manual
4-4
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occurrence is referred to as
dropout
. If a solid state relay drops out, you
must turn it off with a logic high signal before you can turn it on again.
The dropout voltage and current specifications for the output modules are
given in Appendix A,
Specifications
. For most control applications, such as
controlling motors or lamps, these requirements are not difficult to meet.
Another difference between these output modules and conventional relays
is that they do not turn off completely. A small leakage current flows all the
time, even in the off state. For most control applications, this current causes
no problems.
SSR-OAC-5, 120 VAC
The SSR-OAC-5 output module uses a DIO line from the E Series DAQ
device to switch an external 24–140 VAC load at up to 3.5 A. When the
E Series DAQ device DIO line sends a logic low, this turns on the
corresponding SSR-OAC-5 module and allows current to flow. If a logic
high is sent, the module turns off. Figure 4-3 shows the SSR-OAC circuit
diagram.
Figure 4-3.
SSR-OAC AC Output Diagram
1
2
3
4
Rx
VAC
Trigger
Circuit
Snubber
Load
Load
–
+
DC Control
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