Section 1
General Information
5-16 Troubleshooting
MN722
Electrical Noise Considerations Continued
Combining an R-C snubber and twisted-pair shielded cable keeps the voltage in a circuit
to less than 2 V for a fraction of a millisecond. The waveform shown in Figure 5-3 in
addition to the snubber across the coil, the adjacent wire is grounded in a twisted–pair,
shielded cable. Note that the vertical scale is 1 V/div., rather than the 20 V/div. in figures
5-1 and 5-2. This shows that snubbers and twisted-pair shielded wire should be used for
sensitive circuits located adjacent to coil wires.
Figure 5-3 R-C Snubber Circuit & twisted-pair
A reverse biased diode across a DC coil achieves the same result as adding an R–C
snubber across an AC coil, Figure 5-4.
Figure 5-4 AC & DC Coil Noise Suppression
AC Coil
DC Coil
RC snubber
0.47
m
F
Diode
–
+
33
W
Summary of Contents for 22H series
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Page 105: ...Section 1 General Information 5 22 Troubleshooting MN722...
Page 109: ...Section 1 General Information 6 4 Manual Tuning the Series 22H Control MN722...
Page 137: ...Section 1 General Information A 8 Appendix A MN722...
Page 138: ...Appendix B Appendix B 1 MN722...
