WattMaster WHP | Section 4 |
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5.3.5Checking the MiniLink Network Driver
Diagram
Meter Set To Read DC Volts
These tests assume that the MiniLink being checked is powered up
Note:Overview
This check is intended to determine if the Network Comm Driver chip on a MiniLink is damaged.
Before unplugging the Network loop from the MiniLink, observe the Network Loop Tip:LED (located near the connector). It should periodically “flicker” as the CommLink II requests data from the MiniLink. The LED will also flicker when power to the CommLink II is cycled. If the LED is not flickering, the unit is not communicating
with the CommLink II.
Damage typically occurs when the communications loop is exposed to excessive voltage, as may occur during installation due to wiring errors. The driver chips are socketed on all boards to facilitate servicing. It is unusual for driver chips to fail during normal operation. Almost all failures occur as a result of wiring related problems.
Measurements
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| NetworkT – SHLDLoop | 2.4 - 2.5 Volts DC | AcceptableRange | ||
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| R – SHLD | 2.4 - 2.5 Volts DC |
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| Minor variances may not indicate a problem if both tests indicate similar values | ||||
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| Action |
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| If voltages are tooConditionhigh or too low on either |
| The MiniLink hasActiona damaged Network | ||
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| Comm Driver chip. Replace the driver | |
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| chip. See "1.3.11Comm Driver Chip Re- | |
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| placement”. | |
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