or closing command and the auxiliary contacts’ state change. The opening travel
time is measured between the rising edge of the OPEN_CB_EXE command and the
POSOPEN
auxiliary contact. The closing travel time is measured between the rising
edge of the CLOSE_CB_EXEC command and the POSCLOSE auxiliary contact.
Figure 283: Travel time calculation when Travel time Clc mode is “From Cmd to Pos”
There is a time difference t
1
between the start of the main contact opening and
the OPEN_CB_EXE command. Similarly, there is a time gap t
2
between the time
when the
POSOPEN
auxiliary contact opens and the main contact is completely open.
Therefore, to incorporate the times t
1
and t
2
, a correction factor needs to be added
with t
open
to get the actual opening time. This factor is added with the
Opening
time Cor (= t
2
- t
1
) setting. The closing time is calculated by adding the value set
with the
Closing time Cor(t
4
- t
3
) setting to the measured closing time.
The last measured opening travel time
T_TRV_OP
and the closing travel time
T_TRV_CL
are available in the monitored data view on the LHMI or through tools
via communications.
Alarm limit check
When the measured opening travel time is longer than the value set with the
Open
alarm time setting, the
TRV_T_OP_ALM
output is activated. Respectively, when the
measured closing travel time is longer than the value set with the
Close alarm time
setting, the
TRV_T_CL_ALM
output is activated.
It is also possible to block the
TRV_T_CL_ALM
and
TRV_T_OP_ALM
alarm signals by
activating the
BLOCK
input.
7.1.4.4
Operation counter
The operation counter subfunction calculates the number of breaker operation
cycles. The opening and closing operations are both included in one operation cycle.
The operation counter value is updated after each opening operation.
Condition monitoring functions
1MRS758755 C
556
REC615 & RER615
Technical Manual
