Binary Outputs (Output Relays); Figure 2.9-1 Binary Output Logic - Siemens Argus 7SR21 Technical Manual

7SR210 & 7SR220 Description of Operation
2.9

Binary Outputs (Output Relays)

Relays are fitted with 6, 8, 14 or 16 binary outputs (BO). All outputs are fully user configurable and can be
programmed to operate from any or all of the available functions.
The Power Supply module includes the relay basic 6 x BO contacts configured as 1 x normally closed (NC), 2 x
change-over (CO) and 3 x normally open (NO) contacts.
Non-directional (7SR21) relays have two additional binary outputs providing 2 x NO contacts on the analogue
module. Additional I/O modules may be fitted providing an extra 8 x NO contacts.
In the default mode of operation binary outputs are self reset and remain energised for a user configurable
minimum time of up to 60 seconds. If required, outputs can be programmed to operate as 'hand reset' or 'pulsed'.
If the output relay is programmed to be 'hand reset' and 'pulsed' then the output will be 'hand reset' only.
The binary outputs can be used to operate the trip coils of the circuit breaker directly where the trip coil current
does not exceed the 'make and carry' contact rating. The circuit breaker auxiliary contacts or other in-series
auxiliary device must be used to break the trip coil current.
Any BO can be assigned as a 'Trip Contact' in the OUTPUT CONFIG>TRIP CONFIG menu. Operation of a 'Trip
Contact' will operate any LED or virtual assigned from the trip triggered feature in the same menu and will initiate
the fault record storage, actuate the 'Trip Alert' screen where enabled and CB Fail protection when enabled.
When the relay is withdrawn from the case all normally closed contacts will be open circuited. This should be
considered in the design of the control and protection circuitry.
Notes on Pulsed Outputs
When operated, the output will reset after a user configurable time of up to 60 seconds regardless of the initiating
condition.
Notes on Self Reset Outputs
Self reset operation has a minimum reset time of 100 ms.
With a failed breaker condition the relay may remain operated until current flow is interrupted by an upstream
device. When the current is removed the relay will then reset and attempt to interrupt trip coil current flowing via
its output contact. Where this current level is above the break rating of the output contact an auxiliary relay with
heavy-duty contacts should be utilised in the primary system to avoid damage to the relay.
Notes on Hand Reset Outputs
Hand reset outputs can be reset by either pressing the TEST/RESET► button, by energising a suitably
programmed binary input, or, by sending an appropriate command over the data communications channel(s).
On loss of the auxiliary supply hand-reset outputs will reset. When the auxiliary supply is re-established the binary
output will remain in the reset state unless the initiating condition is still present.
Logic signals,
e.g. '51-1'
OUTPUT CONFIG>
OUTPUT MATRIX
(Or gates)
Unrestricted Page 22 of 94
Reset LEDs & Outputs (TEST/RESET key, Binary Input, Data Comms)
BO 1
Hand Reset
BO 1 hand reset
OUTPUT
CONFIG>
BINARY
OUTPUT
CONFIG
BO n
BO n hand reset

Figure 2.9-1 Binary Output Logic

&
1
Min Operate Time
&
1
OUTPUT
CONFIG>
BINARY
OUTPUT
CONFIG
&
1
&
1
©2018 Siemens Protection Devices Limited
Output 1
S
Q Event
R
&
Output n
S
Q Event
R
&