9 – 16
Short-time delayed short-circuit protection switchable to I
2
t
Trip units ETU745 - 776 make it possible to switch over from a constant delay time to an I
2
t-characteristic. In this way, the delay time
depends on the short-circuit current, but with a constant I
2
t
sd
-value, providing better coordination with downstream fuses.
In this case, the setting options for the short-time delay t
R
are as follows:
Switchover to the I
2
t
sd
characteristic can be made via:
- the t
sd
rotary coding switch (ETU745
-
748); this must be set to a value in the white area.
.
- the graphical display (ETU776)
- the BDA (ETU776)
- the PROFIBUS-DP (ETU776)
- the MODBUS (ETU776).
Changeable parameter sets
Trip units ETU745 - 776 make it possible to store two different parameter sets for protective functions.
This enables new protection settings to be adopted when a transfer to another supply source takes place.
Switchover can be made manually via:
- the graphical display (ETU776)
- the test socket with the BDA
or automatically via:
- the
Cublicle
BUS
with an input signal at the digital input module.
- the PROFIBUS-DP
- the MODBUS.
Settings for t
sd
ETU745 - 748
t
sd
= 0.1 / 0.2 / 0.3 / 0.4 sec. (at 12 x I
n
)
ETU776
t
sd
= 0.1 - 0.4 sec. (bei 12 x I
n
)
Содержание UL 1066
Страница 43: ...6 12 7 Reset reclosing lockout 8 Charge closing spring 9 Switch ON Frame size II Frame size III 9X ...
Страница 56: ...7 5 7 2 Frame size II fused ...
Страница 58: ...7 7 ...
Страница 63: ...7 12 8 27 210 0 8 27 210 0 8 27 210 0 3 75 95 2 ...
Страница 64: ...7 13 ...
Страница 65: ...7 14 7 7 Frame size III fuse carriage ...
Страница 66: ...7 15 ...
Страница 69: ...7 18 7 9 External sensor for neutral conductor WLNCT2 ...
Страница 70: ...7 19 WLNCT3 ...
Страница 85: ...9 5 I tripping Ground fault tripping ...
Страница 231: ...15 12 Pre assembling the locking module Installing 0767 1 2 3 4 6 5 ...
Страница 232: ...15 13 1 Socket head cap screw M5 with washer and nut 7 8 Size 4 5 Nm 45 lb in ...
Страница 271: ...19 10 Function check Then Fit back front panel and side cover on the right if it was removed page 23 4 10 ...
Страница 280: ...21 2 Installing the door sealing frame Not for use with fuse carriages Catalog No Door sealing frame WLDSF 1 2 3 NOTICE ...
Страница 289: ...23 7 23 3 3 Installing arc chutes 1 2 6 5 PH 2 0043 02 3 4 5 6 For frame size III 3 PH 2 ...
Страница 298: ...23 16 6 7 8 9 5 2 1 Size 5 mm ...
Страница 333: ......