Figure 3-1. Contact Protection Using A Flyback Diode For Dc Inductive Loads; Table 3-1. Arc Suppressor Placement, Com To No - National Instruments SCXI-1161 User Manual

Chapter 3 Signal Connections
SCXI-1161 User Manual
+
VDC V
-
COM
NO

Figure 3-1. Contact Protection Using a Flyback Diode for DC Inductive Loads

In addition, the module has pads on which you can place an arc
suppressor protection circuit to limit the voltage spike generated during
the switching of inductive loads. These pads are between the COM
position and the NO position and between the COM position and the NC
position of the relays.
To determine where to place each arc suppressor, refer to Tables 3-1
and 3-2, which indicate the channel and suppressor pad assignments.

Table 3-1. Arc Suppressor Placement, COM to NO

COM to NO
Channel Number
0
1
2
3
4
5
6
7
Inductive Load
NC
Transient Voltage Suppressor
3-2
Flyback Diode
Reference Designator
VR1
VR3
VR5
VR7
VR9
VR11
VR13
VR15
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