Eaton Rack Power Module
164201675—Rev 02
17
The LED display contains 15 columns of eight LEDs each. From the bottom up, the first five LEDs illuminate
green, the next two illuminate yellow, and the top LED illuminates red.
The RPM-3U/3Ui senses the continously varying analog CT currents, samples them, calculates their RMS
values, and then illuminates the correct LEDs to indicate load status.
Breaker metering is normalized: the RPM-3U/3Ui scales the display readings based on the type of breaker (15A,
20A, 30A) used on the output and the ratings on the input. If a mix of breaker amperages are connected, then
all are normalized to the highest rating.
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The RPM-3U/3Ui has two indicators to the left of the LED display:
Table 2. Alarm Indicators
Indicator
On
Off
Alarm
Alarm Condition (red)
No alarm present
Power*
On Utility (green)
No Utility present
* Power to internal metering and display is within acceptable limits.
An alarm sounds an audible buzzer. The alarm resets when the condition is corrected. For more information
about alarm conditions, see “
”.
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VS
SS
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The 50 kA/phase TVSS feature is optional.
Table 3. TVSS Light Indicators
Indicator
Green
Red
Off
TVSS
Active
Fail*
No TVSS present
*TVSS failure sounds an audible buzzer. See “
”The DB-9 communication port, A/B switch, and
reset switch are service-only features..
Summary of Contents for RPM-3U
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