ABB REB650, Technical Manual

Page: 330 / 504

the breaker status monitoring can be described by using a module diagram. All the
modules in the diagram are explained in the next sections.
Contact
position
indicator
POSCLOSE
POSOPEN
52a
CBOPEN
Phase
current
check
CBINVPOS
I3P
I_A
I_B
I_C
GUID-60ADC120-4B5A-40D8-B1C5-475E4634214B-ANSI V1 EN
Figure 129: Functional module diagram for monitoring circuit breaker status
BLOCK and BLK_ALM inputs
Phase current check
This module compares the three phase currents with the setting AccDisLevel . If the
current in a phase exceeds the set level, information about phase is reported to the
contact position indicator module.
Contact position indicator
The circuit breaker status is open if the auxiliary input contact
POSCLOSE
is low, the
POSOPEN
input is high and the current is zero. The circuit breaker is closed when the
POSOPEN
input is low and the
POSCLOSE
input is high. The breaker is in the
intermediate position if both the auxiliary contacts have the same value, that is, both
are in the logical level "0" or "1", or if the auxiliary input contact
POSCLOSE
is low
and the
POSOPEN
input is high, but the current is not zero.
The status of the breaker is indicated with the binary outputs
CBOPEN
,
CBINVPOS
and 52a for open, intermediate and closed position respectively.
12.17.7.2 Circuit breaker operation monitoring
The purpose of the circuit breaker operation monitoring subfunction is to indicate if the
circuit breaker has not been operated for a long time.
The operation of the circuit breaker operation monitoring can be described by using a
module diagram. All the modules in the diagram are explained in the next sections.
Section 12
1MRK 505 277-UUS C
Monitoring
324
Technical Manual