Noise checklist – Rockwell Automation System Design for the Control of Electrical Noise User Manual
Page 118
Publication GMC-RM001A-EN-P — July 2001
A-16
Noise Control Supplement
Noise Checklist
Use the following checklist to ensure that the number of potential
noise sources in your system is reduced and that the noise sensitive
components are not affected by the remaining noise.
System Identification:
Checked by:
Date:
Chapter
Title
Technique
Done
2
Zinc plated panels, bonded together top, middle, bottom
Panels bonded to machine structure by continuous low impedance paths
3
Segregating Sources and
Victims
Components segregated into Clean, Dirty and Very Dirty zones
Wiring segregated using color coded wireways with added shields, if
required
Wiring loops avoided
Wire run around the clean zone wireway to monitor for noise
4
Shielding Wires, Cables,
and Components
Additional shields between closely spaced zones
All clean signal cables shielded where appropriate
Shields grounded both ends at their circular cross section
5
EMC filters fitted adjacent to PWM loads
DC filters fitted where low voltage DC power crosses between zones
6
All contact-switched loads suppressed
7
Grounded DC power commons
De-coupled DC power at clean loads
8
Shielded cable for all VS motor power, grounded at both ends
Cable joints minimized (direct drive/motor preferred). Bulkhead connectors or
shielded junction boxes used.
9
High Speed Registration
Inputs
Shielded cable grounded to detector body and main panel
Clean power supply
10
Shielded cable grounded to detector body and main panel
Clean power supply
11
Measuring Noise
Reduction Effectiveness
Measure initial noise levels on DC distribution lines and install monitor wires
for periodic checks and recording