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8.7 PR121-PR122-PR123 trip unit functional test
1.
Prior to operate and / or carry out any replacements on the CB, this must be open, with discharged spring and
disconnected
2.
Remove the Trip unit ( DUT ) from the CB following the instructions in the installation manual of the CB
n°1SDH000460R0002 ÷ 1SDH000460R0005 or 1SDH000532R0002 and in the instructions sheet n°
1SDH000460R0501, 1SDH000460R0502 or 1SDH000460R0503.
3.
Take note of the settings present on the trip unit ( DUT ); these settings must be reset after the test.
4.
Remove the trip unit (DUT) from the CB, leaving the key plug connected to the CB (That key plug must be
reconnected to the triP unit after the test)
5.
Connect the Key plug indicated in Figure 21 to the corresponding connector on the back side of the DUT
6. Connect the extension cable to TS3.
7. Connect the PR12x test cable to the extension cable.
8.
Connect the XK1 and TC connections to the DUT with proper key plug.
9.
Connect the PR030/B on the front size of the trip unit.
8.7.1
PR121 installation
Verify that configuration error is present, indicated with periodic blinking (1 blink every 0,5 s) of yellow led of
o
L protection
Press "i Test" button for few seconds until all red leds flash on, confirming the installation
o
Remove the battery PR030/B.
o
Set the current and time values for the protection available on the DUT.
o
Reconnect the battery PR030/B.
o
Verify that yellow led of L protection periodically switch on ( 1 blink every 3s)
o
Remove the battery PR030/B.
o
The trip unit is now ready for the test.
o
888.902.6111
Figure 21
Figure 22
TS3
1SDH000670R0002
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