MA-037 - CB Watch 3 Operating Manual
v7.0 - May 2020
Page 84 of 118
Setting Spring Alarms
Notice:
It is the customer’s responsibility to decide whether to set alarms or not and to
decide what thresholds to set alarms at, as this will depend on the custom
er’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 141
–
Spring energy storage mechanism alarms
Alarm thresholds
Spring rewind time
Data is usually available from the Operating 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
