ABB RELION 620 Series Technical Manual page 775

1MAC504801-IB E
9.5
9.5.1
9.5.2
9.5.3
9.5.4
620 series ANSI
Technical Manual
Emergency start-up 62EST
Identification
Functional description
Emergency start-up
Function block
GUID-3AF99427-2061-47E1-B3AB-FD1C9BF98E76-ANSI V1 EN
Figure 394: Function block
Functionality
An emergency condition can arise in cases where the motor needs to be started despite
knowing that this can increase the temperature above limits or cause a thermal overload
that can damage the motor. The emergency start-up function 62EST allows motor start-
ups during such emergency conditions. 62EST is only to force the protection relay to
allow the restarting of the motor. After the emergency start input is activated, the motor
can be started normally. 62EST itself does not actually restart the motor.
The function contains a blocking functionality. It is possible to block function outputs,
timer or the function itself, if desired.
Operation principle
The function can be enabled and disabled with the Operation setting. The corresponding
parameter values are "Enable" and "Disable".
The operation of the emergency start-up can be described using a module diagram. All the
modules in the diagram are explained in the next sections.
IEC 61850 IEC 60617
identification identification
ESMGAPC ESTART
Section 9
Control functions
ANSI/IEEE C37.2
device number
62EST
769