Status Indicators - National Instruments FP-RLY-420 Operating Instructions Manual

In-Rush Current
The type of load and its in-rush current characteristics, together
with switching frequency, can cause contact welding. For loads
with in-rush current, measure the steady state current and in-rush
current to determine the proper relay. Some typical types of loads
and the in-rush current they create are summarized in the following
chart.
Type of Load
Resistive load
Solenoid load
Motor load
Incandescent lamp load
Mercury lamp load
Sodium vapor lamp load
Capacitive load
Transformer load

Status Indicators

Figure 5 shows the module label and status indicators. You can
remove the insertable label to see wiring diagrams for the input
channels.
Figure 5. Status Indicators and Module Label
FP-RLY-420
In-Rush Current
Steady-state current
10 to 20 times the steady-state current
5 to 10 times the steady-state current
10 to 15 times the steady-state current
Approximately 3 times the steady-state
current
1 to 3 times the steady-state current
20 to 40 times the steady-state current
5 to 15 times the steady-state current
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