9 – 45
Replacing rating plug
9.1.9
Ground-fault protection modules
Various trip units can be optionally equipped with ground-fault protection modules. The following ground-fault protection modules cannot be
removed once they have been installed.
Depending on the ground-fault protection module version, the set value being exceeded will cause either an alarm only or an alarm and a
trip at the same time.
The following device combinations are possible:
The following options exist for ground-fault detection:
- vectorial summation of the phase currents or vectorial summation of the phase currents and the neutral conductor current if a
neutral sensor is used
- Direct measurement of the ground-fault current using a separate 1200 A : 1 A ground-fault sensor
Input current carrying capacity of the ground-fault protection module:
- max. 1 A continuous
- max. 5 A for 0.5 sec.
Alarm and tripped signals can be transmitted via the
c
, PROFIBUS-DP and MODBUS.
Module GFM A 745
- Alarm only, circuit breaker does not trip
- The changeover switch for ground-fault detection is only accessible when the control panel or the trip unit itself is removed.
NOTICE
Circuit breaker may trip.
If the trip settings are changed while the breaker is closed (and under load) the breaker may trip.
Adjust parameters only when the circuit breaker is in the open position.
Trip unit
Ground-fault protection module
ETU745 - 748
GFM A 745-748
GFM AT 745-748
ETU776
GFM A 776
GFM AT 776
2
3
OPEN
1
Rotary coding switch for ground-fault
alarm setting value
Ground-fault alarm indicator
Rotary coding switch for ground-fault
delay setting t
g
/ I
2
t
g
Changeover switch for ground-fault
detection
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: ......