Basler BE1-CDS220, Instruction Manual

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6-28 Reporting and Alarm Functions BE1-CDS220
Trip
Other
Relays
+
-
851
IN6
CDS
OUT1
R
52a
52TC
Monitor
D2850-14
06-25-99
62X
TCM
+
V
-
+
V
-
62X
52a
Trip
Figure 6-15. TCM with Other Devices
In Figure 6-15, a 62x auxiliary relay is shown. In this case, the impedance of the 62x coil is small
compared to the impedance of the TCM circuit so the TCM is always at logic 1. This prevents the TCM
logic from working, even if the trip coil is open. Normally, when redundant systems are used, each relay
system is on an individual circuit and the sensing input for each relay system is isolated from the tripping
circuit.
Setting the Trip Coil Monitor Function
The TCM function can be programmed from the ASCII command interface using the SL-CKTMON
(setting logic, circuit monitor) command.
FAULT REPORTING
Fault Reporting Expressions and Settings
The fault reporting function records and reports information about faults that have been detected by the
relay. The BE1-CDS220 provides many fault reporting features. These features include Fault Summary
Reports, Sequence of Events Recorder Reports, Oscillographic Records, and Targets.
Logic expressions are used to define the three conditions for fault reporting. These conditions are Trip,
Pickup, and Logic trigger. Figure 6-9 and Table 6-11 illustrate how each of these logic expressions is
used by the various relay functions. Note that even though BESTlogic expressions are used to define
these conditions, these expressions are not included here. Section 7, BESTlogic Programmable Logic,
provides information about using BESTlogic to program the relay.
Trip
Trip expressions are used by the fault reporting function to start logging targets for an event and to record
the fault current magnitudes at the time of trip. The HMI uses the trip expression to seal-in the Trip LED.
The breaker monitoring function uses the trip expression to start counting the breaker operate time.
Pickup
Pickup expressions are used by the fault reporting function to time-stamp the fault summary record, time
the length of the fault from pickup to dropout (fault clearing time), and to control the recording of
oscillograph data. The HMI uses the pickup expression to control the flashing of the Trip LED. A pickup
expression is also used by the setting group selection function to prevent a setting group change during a
fault.
Logic
Logic trigger expressions allow the fault reporting function to be triggered even though the relay in not
picked up. A logic trigger expression provides an input to the fault reporting function much as the pickup
expression does. This logic expression is not used by the setting group selection or the HMI.