GE Industrial Solutions TVRMS2 Digital Test Kit - Manual (Page 17)

TVRMS2 Digital Test Kit
Chapter 4. Power+™, RMS-9, and Epic Trip Units
11
... ..... ..... ..... .
Ground Fault Pickup = .25S
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Ground Fault Pickup setting display.
Ground Fault Pickup is always displayed as a multiple of S,
the current sensor rating. This value is found on the
faceplate of the Trip Unit rating plug and on the circuit
breaker nameplate.
Press
AGAIN
( F1 ) to repeat the test at a different switch
setting. Press
MORE
( F3 ) to display the Ground Fault Delay
setting:
... ..... ..... ..... ...
Ground Fault Delay = I2T IN, MAX Band
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Ground Fault Delay setting display.
This display shows the delay slope (
I2T IN
or
I2T OUT
)
and the delay length (
MIN
,
INT
, or
MAX
). This display
shows the actual setting of the Ground Fault Delay switch,
which is not affected by the Zone Selective Interlock input.
Pressing MORE ( F3 ) causes the Test Kit to check for the
Zone Selective Interlock option for Ground Fault. If it is
not installed, the display contains the message:
... ..... ..... ..... .....
Zone Interlock not included
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Display when Zone Selective Interlock is not installed.
If this option is installed in the Trip Unit, the present state
(
ON
or
OFF
) is displayed, along with the modified value of
the Short Time Delay band, as illustrated below:
... ..... ..... ..... ..... ..
Zone Interlock ON (Delay Band = MAX)
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Zone Selective Interlock status display.
If the Zone Selective Interlock option is installed and the
input is active, the delay band is the same as set by the
switch setting. If the Zone Selective Interlock input is off,
then the delay band is set to minimum (
MIN
) delay
Press
MORE
( F3 ) to return to settings menu #3 or
EXIT
( F4 )
to return to the function test menu.
Failures
If any switch setting is not read properly during the test,
first verify that the switch is properly seated by turning it to
a different setting, then back to the desired setting. Press
AGAIN
( F1 ) to repeat the test. If the switch is still not read
properly, the Trip Unit under test should be replaced and
referred to an authorized GE service representative.
If the rating plug value read by the Test Kit does not
match the value shown on the front of the rating plug, de-
energize the breaker, remove and then reinstall the rating
plug. If the value read by the Test Kit still does not match,
the rating plug should be replaced.
4–3 Self-Test Report
Select
SELF TEST
( F3 ) from the Trip Unit tests menu to
initiate the Trip Unit self-test. The test verifies the
operation of the following:
• Analog-to-digital converter
• Read-only memory (ROM)
• Random-access memory (RAM)
• Nonvolatile memory
If all modules pass the self-test, the following message is
displayed:
Trip Unit is OK
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Trip Unit self-test display.
Press the
MORE
( F3 ) key to return to the Trip Unit test
menu or
EXIT
( F4 ) to return to the function test menu.
If the Trip Unit fails the self-test, a failure message is
displayed for each of the subunits that failed. If more than
one subunit failed, press the
MORE
(
F3
) key to display them
all. The failure messages are displayed as follows:
... ..... ..... ..... ..... ..... .....
A/D Converter Failed
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A/D converter failure message.
... ..... ..... ..... ..... ..... ..... ..
RAM Failed
|– MORE –|– EXIT –|
RAM failure message.
... ..... ..... ..... ..... ..... ..... ....
ROM Failed
|– MORE –|– EXIT –|
ROM failure message.
... ..... ..... ..... ..... ..... ..... ..... .
Non-volatile Memory Failed
|– MORE –|– EXIT –|
Nonvolatile memory failure message.