Motor Load Jam Protection Jamptoc (Ansi 50Tdjam) - ABB RELION REX640 Technical Manual

Protection functions
4.1.6.10 Technical data
Table 451: T2PTTR Technical data
Characteristic
Operation accuracy
Operate time accuracy
4.1.7

Motor load jam protection JAMPTOC (ANSI 50TDJAM)

4.1.7.1 Identification
Function description
Motor load jam protection
4.1.7.2 Function block
Figure 231: Function block
4.1.7.3 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.
4.1.7.4 Analog channel configuration
JAMPTOC has one analog group input which must be properly configured.
1
Overload current > 1.2 x Operate level temperature
398
1
IEC 61850
identification
JAMPTOC
Value
Depending on the frequency of the measured
current: f ±2 Hz
n
Current measurement: ±1.5% of the set value
or ±0.002 x I (at currents in the range of
n
0.01...4.00 x I )
n
±2.0% of the theoretical value or ±0.50 s
IEC 60617
identification
Ist>
1MRS759142 F
ANSI/IEEE C37.2
device number
50TDJAM
REX640
Technical Manual