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CB Watch 3 User Manual v6.3 - May 2019 Page 62 of 100

Setting 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 control circuit monitoring:

Figure 97 – Control circuit monitoring alarms

Threshold values

DC Voltage Supply

This depends on what acceptable level has been set as a policy or what minimum

voltage is required by the coils. Normally, low voltage tests are run during the CB FAT and

the lowest tested value could be used as the minimum alarm level. High level alarm is

much less of a concern and can be effectively de-activated by using a very high

threshold like 500V.

If this function is not being monitored and no sensor is present, then the values should be

set as such to avoid any erroneous alarm:

HMI: Settings / Analogue channels

Figure 98 – DC voltage default settings

Min Alarm Max Alarm Digital Relay

Coil circuit DC voltage source 1 Yes Yes Yes Yes

Coil circuit DC voltage source 2 Yes Yes Yes Yes

Mean coil current - Open 1, per pole No Yes Yes

Mean coil current - Open 2, per pole No Yes Yes

Mean coil current - Close, per pole No Yes Yes Yes

Coil actuation charge - Open 1, per pole Yes Yes Yes

Coil actuation charge - Open 2, per pole Yes Yes Yes

Coil actuation charge - Close, per pole Yes Yes Yes Yes

Coil continuity - Open 1, per pole

Coil continuity - Open 2, per pole

Coil continuity - Close, per pole

Data obtained from CBW3

Yes

Thresholds

Alarms available

Yes

GE CB Watch 3 User Manual

Questions and Answers: