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Technical description
7 Application
7.2 Trip circuit supervision
VM59.EN001
VAMP 24h support phone +358 (0)20 753 3264
171
Figure 7.2.1-3 An example of digital input DI1 configuration for trip circuit
supervision with one digital input.
Figure 7.2.1-4 An example of output matrix configuration for trip circuit
supervision with one digital input.
Example of dimensioning the external resistor R
:
U
AUX
= 110 Vdc –20 % + 10%
Auxiliary voltage with tolerance
U
DI
= 18 Vdc
Threshold voltage of the digital input
I
DI
= 3 mA
Typical current needed to activate the digital input
including a 1 mA safety margin.
P
COIL
= 50 W
Rated power of the open coil of the circuit breaker. If
this value is not known, 0
can be used for the R
COIL
.
U
MIN
= U
AUX
– 20 % = 88 V
U
MAX
= U
AUX
+ 10 % = 121 V
R
COIL
= U
2AUX
/P = 242
.
Содержание VAMP 59
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