Basler Electric BE1-11m - Manual (Page 144)

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to an alternate setting group that can accommodate the condition. The BE1-11m can be set to alarm for
this condition using the programmable logic alarms.
The BE1-11m has the logic to automatically change setting groups based upon the status of the fuse loss
(60FL).
Automatic Control by Monitoring Line Current
The setting group Switch Threshold and Return Threshold settings determine how the function selects the
active setting group when automatic selection is enabled.
Automatic control of the active setting group allows the BE1-11m to automatically change configuration for
optimum protection based on the current system conditions. For example, in locations where seasonal
changes can cause large variations in loading, the overcurrent protection can be set with sensitive
settings during the majority of the time and switch to a setting group with lower sensitivity (higher pickups)
during the few days of the year when the loading is at peak.
The BE1-11m will switch to a setting group when current rises above the "switch threshold" for the "switch
time" and will return from the setting group when current falls below the "return threshold" for the "return
time." However, if the Switch Threshold is 0 and a nonzero switch-to time is entered, the BE1-11m will
change to the indicated setting group after the switch-to time.
If a group's switch threshold is zero, the group’s switch time delay is zero, and current is being monitored,
then the BE1-11m will never automatically switch to that setting group.
Five settings for each group are used for automatic control. Each group has a Switch Threshold and
Switch Time, a Return Threshold and Return Time, and a Monitor Setting. The Switch and Return
thresholds are set in amps. If you wish to switch settings based upon loading, you could set the Monitor
Setting to Max Phase Current. If you wish to switch settings based upon unbalance, you could set it to
Neutral Current, or Negative-Sequence Current.
This function can also be used to automatically change the active setting group for cold load pickup
conditions. If the Switch Threshold for a group is set to 0 amps, the function will switch to that group when
there is no current flow for the time delay period, indicating that the breaker is open or the circuit source is
out of service.
Note the difference in operation when a switch threshold of 0.5 amps is used. For this setting, the group is
selected when current rises above 0.5 amps.
When the Switch criteria are met for more than one setting group at a time, the function will use the
numerically higher of the enabled setting groups. If the switch-to time delay setting is set to 0 for a setting
group, automatic control for that group is disabled. If the return time delay setting is set to 0 for a setting
group, automatic return for that group is disabled and the BE1-11m will remain in that setting group until
returned manually by logic override control.
Group Control by Monitoring Fuse Loss Status
The active setting group can also be controlled by the status of the fuse loss function (60FL). The BE1-
11m can be instructed to change to Setting Group 1. If the monitored element is 60FL, the switch
threshold, return time, and return threshold are ignored.
Logic Connections
Setting group logic connections are made on the BESTlogicPlus screen in BESTCOMSPlus. The setting
group logic block is illustrated in Figure 97. Logic inputs and outputs are summarized in Table 55.
Setting Groups BE1-11m