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.
5.5.5 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
startup time counter exceeds the restart inhibit level, the value is set slightly below
the restart disable value to allow at least one motor startup.
The activation of the ST_EMERG_RQ digital input allows to perform emergency
start. The IED is forced to a state which allows the restart of motor, and the
operator can now restart the motor. A new emergency start cannot be made until
the 10 minute time-out has passed or until the emergency start is released,
whichever takes longer.
The last change of the emergency start output signal is recorded.
5.5.6 Signals
Table 481: ESMGAPC Input signals
Name
Type Default Description
I_A SIGNAL 0 Phase A current
I_B SIGNAL 0 Phase B current
I_C SIGNAL 0 Phase C current
BLOCK BOOLEAN 0=False Block signal for activating the blocking mode
ST_EMERG_RQ BOOLEAN 0=False Emergency start input
Table 482: ESMGAPC Output signals
Name
Type Description
ST_EMERG_ENA BOOLEAN Emergency start
Section 5 1YHT530004D05 D
Protection related functions
562 615 series
Technical Manual
To Next Page
Loading...
Need help?
General
