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Testing LEDs only
Pushing the "Test" button several times with pauses in between switches the LEDs on successively. After the last LED, all LEDs are
switched on.
Repeated pushing the "TEST" button starts the test mode again, and all LEDs, inputs and outputs are switched off.
Leaving the test mode
Do not press the "TEST" button for approximately 30 sec.
If all LEDs are on, the test mode will already be quitted after about 4 sec.
9.2.3.2 ZSI module
Function
When circuit breakers are combined with ZSI modules, a short-circuit occurring in systems with several grading levels can be precisely
localized.
For this purpose, all circuit breakers are interconnected via their ZSI modules.
When a short-circuit or ground-fault occurs, each circuit breaker affected by the short-circuit current queries its downstream circuit breaker
to determine whether the short-circuit is present in the next downstream device. Only the circuit breaker nearest the short-circuit, in the
upstream direction, is tripped. If "S" or "S+G" is selected on the ZSI module and the circuit breaker does not receive a blocking signal -
ZSI-IN - from its downstream circuit breaker, in the event of short-circuit, the delay time setting for the short-circuit trip is set to 50 ms. If a
short-circuit is detected, a blocking signal - ZSI-OUT - will be sent to the upstream circuit breakers. The trip takes place after 50 ms. It
typically delays between 80 and 90 ms.
If "S" or "S+G" is selected on the ZSI module and the circuit breaker does not receive a blocking signal - ZSI-IN - from its downstream circuit
breaker, in the event of ground-fault, the delay time setting for the ground-fault trip is set to 100 ms.
If a ground-fault is detected, a blocking signal - ZSI-OUT - will be sent to the upstream circuit breakers. The trip takes place after 100 ms.
It typically delays between 130 and 140 ms.
After a maximum delay time of 3 s, a given blocking signal ZSI-OUT is terminated.
Installation
Connection
Only one ZSI module can be connected per circuit breaker.
If the ZSI module is used together with other
c
modules, the ZSI module must be connected directly to the COM module or
secondary terminal block X8.
Summary of Contents for UL 489
Page 36: ...5 21 Frame size II 3000 A Frame size III 1 Holes 14 mm 0720 1 0721_nu ...
Page 63: ...7 2 Horizontal connectors 0733_nu top view ...
Page 64: ...7 3 Rear vertical connectors 0734_nu top view rear view ...
Page 65: ...7 4 Front connectors 0736_nu front view top view ...
Page 66: ...7 5 Front connectors and pressure wire terminals 0737_nu top view front view ...
Page 67: ...7 6 7 2 Frame size II fixed mounted version 0494 3_nu ...
Page 68: ...7 7 Class C always 0494 5_nu top view rear view ...
Page 69: ...7 8 2500 0738_nu LH side view front view ...
Page 71: ...7 10 7 4 Frame size III fixed mounted version 0495 1_nu LH side view ...
Page 72: ...7 11 0495 2_nu top view top view ...
Page 73: ...7 12 0495 3_nu top view rear view ...
Page 75: ...7 14 7 5 Door cut outs fixed mounted circuit breaker Frame size I 0735_nu ...
Page 76: ...7 15 Frame size II III 0496_nu ...
Page 77: ...7 16 7 6 Frame size I draw out version 0745_nu ...
Page 78: ...7 17 0746_nu rear view top view ...
Page 79: ...7 18 0747_nu bottom view ...
Page 80: ...7 19 0748_nu ...
Page 81: ...7 20 0749_nu ...
Page 82: ...7 21 7 7 Frame size II draw out version 0490 1_ul ...
Page 86: ...7 25 7 8 Frame size III draw out version ...
Page 87: ...7 26 ...
Page 88: ...7 27 ...
Page 89: ...7 28 7 9 Door cut outs for draw out circuit breakers Frame size I 0750_nu ...
Page 91: ...7 30 7 11 External sensor for neutral conductor WLNCT2 ...
Page 92: ...7 31 WLNCT3 ...
Page 107: ...9 5 I tripping Ground fault tripping ...
Page 351: ......