WattMaster WHP | Section 4 |
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5.3.3Checking the CommLink II Driver
Diagram
Overview
This test checks for proper Network loop voltages coming from the CommLink II.
The Loop LED (located on the front panel) should “flicker” when the CommLink II is
Tip:attempting to communicate. The Loop LED will flicker more noticeably for a few seconds when first powered up. If the LED does not flicker, the unit is not function- ing.
Proper loop voltages are essential for reliable communications. It is normal to see fluctua- tions at this point on the CommLink II. The average value should be close to the acceptable range described below. Values will vary upon initial powerup for about
Measurements
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| 2.4 - 2.5 Volts DC | AcceptableRange |
(SHLD) |
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R – G | 2.5 - 2.7 Volts DC |
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(SHLD) |
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Action
If voltages are tooConditionhigh or too low on either side
1.The CommLinkActionII has a damaged comm driver chip. Replace the driver chip. See instructions in section 1.3.11 for “Comm Driver Chip Replacement”.
2.The CommLink II is defective.
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