Accessories
4.10 EFB300 external function box
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03
497
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– Alarm level AL1 (90% I
r
)
– Alarm level AL2 (105% I
r
)
– Temperature alarm
– Load shedding or load pick up
By means of the load shedding and load pick up signals, a load can be switched off or
connected automatically depending on the capacity utilization of the 3VA molded case
circuit breaker.
– Ground-fault alarm
– Internal ETU fault
– Group signal for all warnings
– Pre-trip for overload
This warning appears 200 ms before an overload trip. This allows the user to bring
frequency converters into a safe state, for example.
●
– The four digital outputs can be controlled directly from the fieldbus/Ethernet.
Possible application: Control of an MO320 motor operator without communication
capability
●
– The 8-series ETUs offer a total of four limit value settings. Almost all measured values
are available for monitoring. These can be assigned a hysteresis and an additional
time delay. In the event of upward or downward violation of the set measured value, a
limit value violation is generated which can be output via the EFB300 outputs and also
transmitted via the communication system.
One possible example is to signal the measured frequency in a combined heat and
power plant.
●
(with ETU 8-series only)
An energy pulse (S0 signal pulse) contains information pertaining to the consumption of a
specific quantity of energy. The data are transmitted by weighted pulses, i.e. a specific
number of pulses are transferred to represent one kWh unit.
Settings for the energy pulse, see table on next page.
Example of energy pulse:
Energy meter source: Active energy kWh
Pulses per unit: 5
Unit: 20 kWh
Pulse length: 30 ms
Output of 140 kWh: Output of 35 pulses, each 30 ms in length
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