ABB REC650 Applications Manual page 184

Section 9
Secondary system supervision
178
IS: Constant current generator.
Current level ~ 1,0 mA (I
V: Transient Voltage Suppressor
Breakdown Voltage 380 to 400 VDC
PO1
TCS1
I
c
IS
HW
S W
TCSSCBR
TCS_STATE ALARM
BLOCK
GUID-B056E9DB-E3E5-4300-9150-45916F485CA7 V2 EN
Figure 66: Operating principle of the trip-circuit supervision with an external resistor.
The TCSSCBR blocking switch is not required since the external resistor
is used.
If the TCSSCBR is required only in a closed position, the external shunt resistance may
be omitted. When the circuit breaker is in the open position, the TCSSCBR sees the
situation as a faulty circuit. One way to avoid TCSSCBR operation in this situation would
be to block the monitoring function whenever the circuit breaker is open.
)
c
(-)
PSM
1
V
2
(+)
1MRK 511 286-UUS A
R ext
Rs
IEC13000025-2-en.vsd
Application manual