ABB RELION REX640 Technical Manual page 1000

Section 4
Protection functions
994
CB_CLOSED
I3P
BLK_LK_ST
ST_EMERG_ENA
BLOCK
STALL_IND
GUID-7859F9EC-F854-479E-A931-CF2E1A0544D4 V1 EN
Figure 538: Functional module diagram
Startup supervisor
This module detects the starting of the motor. The starting and stalling motor
conditions are detected in four different modes of operation. This is done through the
Operation mode setting.
When the Operation mode setting is operated in the "IIt" mode, the function calculates
the value of the thermal stress of the motor during the start-up condition. In this mode,
the start-up condition is detected by monitoring the TRMS currents.
I_A
Startup
I_B
supervisor
I_C
Cumulative
startup
protection
Thermal
stress
calculator
Stall
protection
1MRS759142 C
MOT_START
LOCK_START
OPR_IIT
OPR_STALL
REX640
Technical Manual