7SR210 & 7SR220 Description of Operation
Unrestricted ©2018 Siemens Protection Devices Limited
Page 23 of 94
2.10 Virtual Input/Outputs
The relays have 16 virtual input/outputs, these are internal logic states. Virtual I/O is assigned in the same way as
physical Binary Inputs and Binary Outputs. Virtual I/O is mapped from within the INPUT CONFIG > INPUT
MATRIX and OUTPUT CONFIG > OUTPUT MATRIX menus.
The status of the virtual inputs and outputs is volatile i.e. not stored during power loss.
2.11 Self Monitoring
The relay incorporates a number of self-monitoring features. Each of these features can initiate a controlled reset
recovery sequence.
Supervision includes a power supply watchdog, code execution watchdog, memory checks by checksum and
processor/ADC health checks. When all checks indicate the relay is operating correctly the ‘Protection Healthy’
LED is illuminated.
If an internal failure is detected, a message will be displayed. The relay will reset in an attempt to rectify the
failure. This will result in de-energisation of any binary output mapped to ‘protection healthy’ and flashing of the
protection healthy LED. If a successful reset is achieved by the relay the LED and output contact will revert back
to normal operational mode, and the relay will restart, therefore ensuring the circuit is protected for the maximum
time.
A Start-up Counter Meter is provided to display the number of start-ups the relay has performed. Once the
number of start-ups has exceeded a set number, an Alarm output can be given.
Figure 2.11-1 Start-up Counter Meter
Reset of the counter can be done from the meter or via a binary input or a command.
Various types of start-up are monitored by the relay:
1.
power-on starts
(auxiliary supply initiation)
2.
expected starts
(user initiated via comms, language changes, custom protection curve etc.)
3.
unexpected starts
(caused by the relay watchdog)
Any combination of these can be selected for the start-up count. This is done in the MAINTENANCE
MENU>START COUNT menu using the
Start Up Types
setting. All the start-up types selected will be added to
the overall start-up count.
The number of restarts before the alarm output is raised is set in the MAINTENANCE MENU>START COUNT
menu using the
Start Up Count Target
setting.
When the number of relay start-ups reaches the target value an output is raised, OUTPUT MATRIX>
Start Up
Count Alarm
, which can be programmed to any combination of binary outputs, LED’s or virtual outputs.
As a further safeguard, if the Relay performs a number of unexpected starts
SYSTEM CONFIG>
Unexpected
Restart Count
in a given time
SYSTEM CONFIG>
Unexpected Restart Period
, it can be configured using the
SYSTEM CONFIG>
Unexpected Restart Blocking
setting to remove itself from service. In this case the Relay
will display a typical error message such as: -
Figure 2.11-2 Start-up Counter Meter
Summary of Contents for Argus 7SR21
Page 1: ...Energy Management 7SR21 7SR22 Argus Overcurrent Relay Reyrolle Protection Devices ...
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Page 4: ...Contents 7SR11 and 7SR12 Page 2 of 2 2018 Siemens Protection Devices Limited ...
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Page 277: ...7SR220 Settings Guide Unrestricted Page 72 of 107 2013 Siemens Protection Devices Limited ...
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