Binary Input Inversion; Oscillation Suppression; Binary Outputs - ABB Relion SMU615 Technical Manual

1MRS758407 B
3.8.2
3.8.3
3.9
SMU615
Technical Manual

Binary input inversion

The parameter Input # invert is used to invert a binary input.
Table 38: Binary input states
Control voltage
No
Yes
No
Yes
When a binary input is inverted, the state of the input is TRUE (1) when no control
voltage is applied to its terminals. Accordingly, the input state is FALSE (0) when a
control voltage is applied to the terminals of the binary input.

Oscillation suppression

Oscillation suppression is used to reduce the load from the system when a binary input
starts oscillating. A binary input is regarded as oscillating if the number of valid state
changes (= number of events after filtering) during one second is equal to or greater
than the set oscillation level value. During oscillation, the binary input is blocked (the
status is invalid) and an event is generated. The state of the input will not change when
it is blocked, that is, its state depends on the condition before blocking.
The binary input is regarded as non-oscillating if the number of valid state changes
during one second is less than the set oscillation level value minus the set oscillation
hysteresis value. Note that the oscillation hysteresis must be set lower than the
oscillation level to enable the input to be restored from oscillation. When the input
returns to a non-oscillating state, the binary input is deblocked (the status is valid) and
an event is generated.
Table 39: Oscillation parameter values
Parameter
Input osc. level
Input osc. hyst

Binary outputs

The merging unit provides a number of binary outputs used for tripping, executing
local or remote control actions of a breaker or a disconnector, and for connecting the
merging unit to external annunciation equipment for indicating, signalling and
recording.
Input # invert
0
0
1
1
Values
2...50 events/s
2...50 events/s
Section 3
Basic functions
State of binary input
FALSE (0)
TRUE (1)
TRUE (1)
FALSE (0)
Default
30 events/s
10 events/s
55