Rockwell Automation System Design for the Control of Electrical Noise - Manual (Page 102)

Publication GMC-RM001A-EN-P — July 2001
11-12 Measuring Noise Reduction Effectiveness
Monitoring Panels
To monitor your system panel:
1. Route a wire around all the clean zone wireways, ensuring that it
lays on top of all other wires (furthest from the panel).
2. Measure voltage peaks between one end of the wire and the
adjacent panel to assess E-field noise.
3. Repeat with the other end grounded to assess B-field noise.
4. Enable each potential noise source in turn to assess its
contribution if required.
Monitoring Systems
This is a good test of system HF bonding techniques. To monitor your
system:
1. Run wires connected to the metal structure of each remote panel
and machine frame to the main panel via the clean zone.
2. Measure voltage peaks between the wire and the adjacent main
panel to assess noise level.
Monitoring General System Conditions
If the wires are made permanent (preferably in a unique color) and
terminated with insulated terminals, useful long term measurements
may be made. To monitor for changes that may affect noise levels:
1. Document system noise levels during commissioning.
2. Re-check noise levels (for example) at twelve month intervals.
Check for deterioration due to corrosion of bond joints or
improper modifications to the wiring.
3. Check for reduced performance due to excessive noise levels
during service.
4. Re-check noise levels after modifications have been made.
An OEM could check for consistency in a series of machines
incorporating this into the quality procedures.