3WL air circuit breakers
3.5 External CubicleBUS modules
3WL/3VL circuit breakers with communication capability - PROFIBUS
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System Manual, 03/2011, A5E01051353-02
Switch position "f"
If the rotary coding switch is at the "f" position, the most important measured values are
output, with the exception of the currents. In conjunction with another module in the position
"I", all important measured values are thus displayed:
A01: Frequency of the system
A02: Mean value of the phase-to-phase voltage
A03: Total active power
A04: Mean value of the power factors
The scale for the display of the frequency must reach from 45 Hz to 65 Hz. This makes it
possible to display the standard frequencies in the IEC and UL countries. Example: 45 Hz
correspond to 0 V/4 mA and 65 Hz correspond to 10 V/20 mA. The scalings of the other
measured values can be read in the appropriate switch positions.
Switch position "cos φ"
The measured values below are output in the switch position "cos φ":
A01: Power factor cos φ
L1
A02: Power factor cos φ
L2
A03: Power factor cos φ
L3
A04: Phase unbalance current in %
The display of the power factors ranges from 0.7 capacitive (corresponding to 0 V/4 mA)
through 1 (corresponding to 5 V/12 mA) to 0.7 inductive (corresponding to 10 V/20 mA). The
phase unbalance of the three currents is output from 0% (0 V/4 mA) to 50% (10 V/20 mA).
Note the correct polarity when connecting.