WattMaster WHP | Section 4 |
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5.3.6Checking the MiniLink Local Loop
Diagram
Meter Set To Read DC Volts
The indicated readings are typical of a normally operating system. Actual readings may vary slightly due to the number of units installed and other factors. Any significant deviation from these values generally indicates a problem.
These tests assume the MiniLink is powered up
Note:Overview
Proper loop voltages are essential for reliable communications. It is normal to see fluctua- tions on an operating communications loop. The average value should be close to the ac- ceptable range described below. Values will vary upon initial powerup for about
Measurements
| TLocal– SHLDLoop | 2.9 - 3.1 Volts DC | AcceptableRange | ||
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| R – SHLD | 1.9 - 2.1 Volts DC |
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| Action |
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| Readings near zeroConditionvolts |
| Check for shortedActionwiring. | ||
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| If voltages are too high or too low on either |
| 1. One or more devices connected to this | ||
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| loop may have damaged Comm Driver | |
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| chips. | |
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| 2. Wiring errors. Check for multiple loops | |
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| inadvertently “cross connected”, short | |
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| circuits, etc. | |
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