GE Industrial Solutions Entellisys 4.0 System User Manual - Manual (Page 35)

Controlling circuit breakers 35
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3.3.1 Block other HMIs
Any HMI that is designated as a Local HMI can block other HMIs from operating circuit breakers.
To designate an HMI as local, click the Modbus Security tab under the Maintenance menu.
When the check box on that screen is checked, the HMI is the Local HMI.
To block other HMIs from the local HMI, click the Control button under the Breaker Status
screen. In the Breaker Control screen there is a check box to Block Other HMIs.
Only Local HMIs have the ability to block other HMIs. If the Block Other HMIs check box is grayed
out, it is not setup as a Local HMI.
CAUTION: When controlling circuit breakers through a local HMI it is recommended that users
block all HMIs to prevent remote circuit breaker control. This step is in addition to normal
lock-out tag-out procedures when applicable.
3.3.2 Open circuit breaker (electrically operated circuit breakers only)
To open a circuit breaker, click OPEN BREAKER on the Breaker Control screen. A dialog box
appears for verification that the circuit breaker should be opened. Click Yes to open the circuit
breaker. Once the open breaker command is verified, the EntelliGuard Messenger uses the
Shunt Trip to actually open the circuit breaker.
If the open breaker command is successful, the circuit breaker opens and the Current State of
the circuit breaker on the Breaker Control screen changes from Closed to Open. If the circuit
breaker does not open, examine the Sequence of Events. One of the following events may be
present:
•
Attention Breaker Open Failed Shunt Trip
•
Note Messngr Reports CPUA (or B) Command Timed Out
See Table A-2 for more information.
3.3.3 Close circuit breaker (electrically operated circuit breakers only)
To close a circuit breaker, click CLOSE BREAKER on the Breaker Control screen. A dialog box
appears for verification that the circuit breaker should be closed. Click Yes to close the circuit
breaker. Once the close breaker command is verified, the EntelliGuard Messenger uses the Close
Coil to actually close the circuit breaker.
If the close breaker command is successful, the circuit breaker closes and the Current State of
the circuit breaker on the Breaker Control screen changes from Open to Closed. If the circuit
breaker does not close, examine the Sequence of Events. One of the following events may be
present:
•
Attention Breaker Close Failed
•
Breaker Close Command Rejected Breaker Locked Out
•
Note Messngr Arbitrated Command From CPUA (or B)
•
Note Messngr Reports CPUA (or B) Command Timed Out