4.1.6.10 Technical data
Table 451: T2PTTR Technical data
Characteristic Value
Operation accuracy Depending on the frequency of the measured
current: f
n
±2 Hz
Current measurement: ±1.5% of the set value
or ±0.002 x I
n
(at currents in the range of
0.01...4.00 x I
n
)
Operate time accuracy
1
±2.0% of the theoretical value or ±0.50 s
4.1.7 Motor load jam protection JAMPTOC (ANSI 50TDJAM)
4.1.7.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Motor load jam protection JAMPTOC Ist> 50TDJAM
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
Protection functions 1MRS759142 F
398 REX640
Technical Manual
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