Motor Load Jam Protection Jamptoc; Identification; Function Block; Functionality - ABB RELION 620 Series Technical Manual

Section 4
Protection functions
4.1.8
4.1.8.1
4.1.8.2
4.1.8.3
4.1.8.4
334

Motor load jam protection JAMPTOC

Identification

Function description
Motor load jam protection

Function block

GUID-FA5FAB32-8730-4985-B228-11B92DD9E626 V2 EN
Figure 163: Function block

Functionality

The motor load jam protection function JAMPTOC is used for protecting the motor in
stall or mechanical jam situations during the running state.
When the motor is started, a separate function is used for the startup protection, and
JAMPTOC is normally blocked during the startup period. When the motor has passed
the starting phase, JAMPTOC monitors the magnitude of phase currents. The function
starts when the measured current exceeds the breakdown torque level, that is, above
the set limit. The operation characteristic is definite time.
The function contains a blocking functionality. It is possible to block the function
outputs.

Operation principle

The function can be enabled and disabled with the Operation setting. The
corresponding parameter values are "On" and "Off".
The operation of JAMPTOC can be described with a module diagram. All the modules
in the diagram are explained in the next sections.
IEC 61850 IEC 60617
identification identification
JAMPTOC Ist>
1MRS757644 F
ANSI/IEEE C37.2
device number
51LR
620 series
Technical Manual