MA-037 - CB Watch 3 Operating Manual
v7.0 - May 2020
Page 80 of 118
Spring Mechanism
Spring rewind time
The spring rewinding motors are usually DC powered. With the motor on/off contacts
connected to the system, we can acquire the time at which these contacts are activated and
therefore measure the duration of the spring rewinding phase (which is the operating time
of the rewinding motor). This is done for the single motor (in a ganged CB) or for the motors
at each of the poles (in an IPO CB). The information is displayed in the HMI as part of the
closing operation data:
The cumulated motor run time is also stored so that maintenance of the motor(s) can be
performed when the prescribed number of run time hours has been reached.
The number of times the motor starts is also recorded, but it is the same as the number of
closing operations so is not very significant with a spring drive.
HMI: Measurements / Last closing results
Figure 131
–
Spring rewind data
When installing in a retrofit situation, the initial value for the counters can be entered:
HMI: Settings / Closing
Figure 132
–
Spring motor initial values
One can compare the spring rewind times recorded after each closing operation with a
minimum and maximum duration threshold. An alarm is triggered if the value recorded falls
outside these limits.
Any shortening of the time may indicate a partially broken spring and any lengthening may
indicate additional friction or a problem with the motor itself.
An alarm can also be set when for the cumulative spring rewind motor run time.
HMI: Settings / Closing
Figure 133
–
Spring rewind time thresholds
