CB Watch 3 User Manual
v6.3 - May 2019
Page 70 of 100
Setting Spring Alarms
Notice:
It is the customer’s responsibility to decide whether to set alarms or not and to
decide what threshol
ds to set alarms at, as this will depend on the customer’s
operational priorities and risk philosophy. However, here are some guidelines that may
prove helpful in deciding what threshold values to use:
Alarm summary
This table summarises all the alarms that can be set for monitoring the spring energy
storage mechanism:
Figure 113
–
Spring energy storage mechanism alarms
Alarm thresholds
Spring rewind time
Data is usually available from the User Manual. A possible value could be 25s, but it
depends on the CB type.
Cumulative spring rewind motor run time
Data is usually available from the motor’s maintenance manual. A
possible value could
be 12,000 min (200 hr), but it depends on the motor type.
Peak spring rewind motor current
Data is usually available from the motor’s maintenance manual. A possible value could
be 25A, but it depends on the CB type.
To avoid any alarms set as follows:
Min Alarm Max Alarm
Digital
Relay
Spring rewind time
Yes
Yes
Yes
Yes
Cumulative spring rewind motor time
No
Yes
Yes
Yes
Peak rewind motor inrush current
No
Yes
Yes
Yes
Data obtained from CBW3
Thresholds
Alarms available
