Siemens SENTRON 3VL System Manual page 131

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CONTINUOUS AMPS
TRIP CLASS
IOC AMPS
UNBALANCE
THERMAL MEMORY
PREALARM ENABLE
PREALARM
BOTTOM OF LIST
Figure 9-5 Example: Changing the type of the protection of the LCD-ETU 40 M
Commissioning
The overcurrent trip unit must be activated before it can be parameterized. A minimum load
current of approximately 20% of the relevant rated current I
The "LCD-ETU" trip unit is preset in the factory with the maximum settings for the overload
release and the short-circuit release. This means activation, and hence parameterization, is
possible when a load is connected with a minimum current of approximately 20% of the
relevant rated current 'I
Changing the parameters for the overload and short-circuit releases during operation to a
value under the present operating value causes instantaneous tripping.
If this minimum load current is not available, the required auxiliary power can be supplied
using the 3VL9000-8AP00 hand-held tester. In circuit breakers with communication
capability, the trip unit is supplied with power by the COM10.
3VL molded-case circuit breakers
System Manual, 03/2009, 110 0110 - 02 DS 01
TOP OF LIST
CHANGE SAVED
CHANGE NOT SAVED
CHANGE SAVED
CHANGE NOT SAVED
CHANGE SAVED
CHANGE NOT SAVED
CHANGE SAVED
CHANGE NOT SAVED
CHANGE SAVED
CHANGE NOT SAVED
CHANGE SAVED
CHANGE NOT SAVED
CHANGE SAVED
CHANGE NOT SAVED
'.
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9.2 Overcurrent trip unit with LCD display
ex: 3VL93256CP35 ; I n = 250 A , I r = 100 A
SAVE CHANGES ?
= YES
= NO
SAVE CHANGES ?
= YES
= NO
SAVE CHANGES ?
= YES
= NO
SAVE CHANGES ?
= YES
= NO
SAVE CHANGES ?
= YES
= NO
SAVE CHANGES ?
= YES
= NO
SAVE CHANGES ?
= YES
= NO
Displays and operator controls
CONTINUOUS AMPS SETTING 100 AMP
DATA
CONTINUOUS AMPS SETTING 250 AMP
TRIP CLASS SETTING = 30
DATA
TRIP CLASS SETTING = 5
INSTANTANEOUS CURRENT = 312 AMPS
DATA
INSTANTANEOUS CURRENT = 2750 AMPS
UNBALANCE AMPS SET TO 50%
DATA
UNBALANCE AMPS SET TO 5%
THERMAL MEMORY IS OFF
DATA
THERMAL MEMORY IS ON
PREALARM IS OFF
DATA
PREALARM IS ON
PREALARM SET AT 80 AMPS
DATA
PREALARM SET AT 100 AMPS
of the circuit breaker is required.
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