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Mounting and Commissioning
3.1 Mounting and Connections
[dw_prinzip-ausloesekreisueberwachung-1-binein, 1, en_US]
Figure 3-2
This results in an upper limit for the resistance dimension, R
value of the arithmetic mean R should be selected:
[formel-mittelwert-r-260602-kn, 1, en_US]
In order that the minimum voltage for controlling the binary input is ensured, R
[formel-rmax-260602-kn, 1, en_US]
So the circuit breaker trip coil does not remain energized in the above case, R
[formel-rmin-260602-kn, 1, en_US]
Constant current with activated BI ( = 0.4 mA)
Ι
BI (HIGH)
V
Minimum control voltage for BI (= 19 V at delivery setting for nominal voltages of 24 V/ 48 V;
BI min
88 V at delivery setting for nominal voltages of 60 V/ 110 V/ 125 V/ 220 V/ 250 V)
V
Control voltage for trip circuit
CTR
R
Ohmic resistance of the circuit breaker coil
CBTC
V
Maximum voltage on the circuit breaker coil that does not lead to tripping
CBTC(LOW)
If the calculation has the result
V
. This threshold is determined via the parameters 220 Threshold BI 1 to 226 Threshold BI 7. The
BI min
settings Thresh. BI 176V, Thresh. BI 88V, Thresh. BI 19V are possible.
126
Trip circuit supervision with one binary input
< R
, the calculation has to be repeated with the next smaller threshold
max
min
and a lower limit R
, from which the optimal
max
min
is derived as:
max
is derived as:
min
SIPROTEC 4, 7RW80, Manual
C53000-G1140-C233-4, Edition 07.2018
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