Operation Principle; Application - ABB RELION 611 Series Technical Manual
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Also See for RELION 611 Series:
- Engineering manual (108 pages) ,
- Applications manual (76 pages) ,
- Installation manual (68 pages)
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1MRS757454 D
5.4.4
5.4.5
611 series
Technical Manual
Operation principle
The function can be enabled and disabled with the Operation setting. The
corresponding parameter values are "On" and "Off".
The operation of ESMGAPC can be described using a module diagram. All the
modules in the diagram are explained in the next sections.
GUID-18128621-4A78-45D0-A788-9116B5213449 V1 EN
Figure 155:
Functional module diagram
Standstill detector
The module detects if the motor is in a standstill condition. The standstill condition
can be detected based on the phase current values. If all three phase currents are below
the set value of Motor standstill A, the motor is considered to be in a standstill
condition.
Timer
The timer is a fixed 10-minute timer that is activated when the ST_EMERG_RQ input
is activated and motor standstill condition is fulfilled. Thus, the activation of the
ST_EMERG_RQ input activates the ST_EMERG_ENA output, provided that the motor
is in a standstill condition. The ST_EMERG_ENA output remains active for 10
minutes or as long as the ST_EMERG_RQ input is high, whichever takes longer.
The activation of the BLOCK input blocks and also resets the timer.
The function also provides the ST_EMERG_ENA output change date and time,
T_ST_EMERG. The information is available in the monitored data view.
Application
If the motor needs to be started in an emergency condition at the risk of damaging the
motor, all the external restart inhibits are ignored, allowing the motor to be restarted.
Furthermore, if the calculated thermal level is higher than the restart inhibit level at an
emergency start condition, the calculated thermal level is set slightly below the restart
inhibit level. Also, if the register value of the cumulative start-up time counter exceeds
the restart inhibit level, the value is set slightly below the restart disable value to allow
at least one motor start-up.
The activation of the ST_EMERG_RQ digital input allows to perform emergency start.
The protection relay is forced to a state which allows the restart of motor, and the
Protection related functions
Section 5
323
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