MA-037 - CB Watch 3 Operating Manual
v7.0 - May 2020
Page 28 of 118
Figure 34
–
Previous operation type
52a/52b contacts switching time
All timing starts from the detection of the open or close command (rising edge of the
current detected on the open or close coil circuit). The auxiliary contact switching time is
measured for each operation:
HMI: Measurements/Last opening results or Last closing results
Figure 35
–
Auxiliary contact timing
•
Auxiliary contact 52a switching time: Time elapsed between open/close command
received and the 52a contact changing status
•
Auxiliary contact 52b switching time: Time elapsed between open/close command
received and the 52b contact changing status
A graph is available showing the contact status change for each pole:
HMI: Measurements/Operations Charts/Opening and Closing
Figure 36
–
Auxiliary contact opening and closing graphs
An alarm is raised if, after an operation request has been detected, the 52a/52b contacts do
not switch status
within 200ms (the “52a/b contact timeout”)
.
This could indicate a faulty contact or an inability for the CB to move/respond to an
operation command
(“order rejection”)
.
HMI: Measurements/Alarms
Figure 37
–
Auxiliary contact alarms
