CB Watch 3 User Manual v6.3 - May 2019 Page 76 of 100
Setting Pump 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 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
hydraulic/pneumatic energy storage mechanism:
Figure 128 – Pump based energy storage mechanism alarms
Alarm thresholds
Number of pump starts /24h
In some instances, an engineered leak ensures that the pump starts every couple of
days, so this should be considered. Depending on how often the breaker is supposed to
operate, more than 2 or 3 pump starts per day should be flagged.
Pump run time /24h
Depending on how long the pump cycle takes (typically 15-20minutes), the pump run
time should not exceed 60 minutes per day.
Cumulative pump 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 pump motor inrush current
Data is usually available from the motor’s maintenance manual. A possible value could
be 50A, but it depends on the motor type.
To avoid any alarms set as follows:
Min Alarm Max Alarm Digital Relay
Number of pump starts /24h No Yes Yes Yes
Pump run time /24h No Yes Yes Yes
Cumulative pump run time No Yes Yes Yes
Pump motor inrush current No Yes Yes Yes
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