Basler Electric BE1-11t - Manual (Page 51)

9424200995 Rev H 39
Programmable Alarm
A 24 Volts per Hz alarm occurs during overexcitation so that corrective action can be taken before the 24
function trips. The alarm appears on the front-panel display, web page interface, and on the Alarms
metering screen in BESTCOMSPlus. Refer to the
Alarms chapter for information about programming
alarms.
When the Alarm Pickup setting is exceeded, a timer is initiated and begins timing toward a trip. The
duration of the timer is established by the alarm Time Delay setting. An alarm Time Delay setting of zero
(0) makes the alarm instantaneous with no intentional time delay.
If the alarm pickup condition persists for the duration of the alarm Time Delay setting, the 24 Volts per Hz
alarm becomes true. If the alarm pickup condition subsides before the alarm time delay expires, the timer
is reset and no corrective action is taken.
Table 7 lists the programmable alarm settings.
Table 7. Programmable Alarm Settings
Setting Range Increment Unit of Measure Default
Alarm Pickup 0 or 0.5 to 6 0.01 V/Hz 0
Alarm Time Delay 0 or 50 to 600,000 varies milliseconds 0
Element Blocking
The Block input provides logic-supervision control of the element. When true, the Block input disables the
element by forcing the Trip and Pickup outputs to logic 0 and resetting the element timer. Connect the
element Block input to the desired logic in BESTlogicPlus. When the element is initially selected from the
Elements view, the default condition of the Block input is a logic 0.
Logic Connections
Overexcitation element logic connections are made on the BESTlogicPlus screen in BESTCOMSPlus.
The overexcitation element logic block is illustrated in Figure 33. Logic inputs and outputs are
summarized in Table 8.
Figure 33. Overexcitation Element Logic Block
Table 8. Logic Inputs and Outputs
Name Function Purpose
Block Input Disables the 24 function when true
Trip Output True when the 24 element is in trip condition
Pickup Output True when the 24 element is in pickup condition
Operational Settings
Overexcitation operational settings are configured on the Overexcitation (24) settings screen (Figure 34)
in BESTCOMSPlus. Setting ranges and defaults are summarized in Table 9.
BE1-11t Overexcitation (24) Protection