CG emotron TSA Series, Instruction Manual

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76 Functionality CG Drives & Automation, 01-5980-01r2
8.2.4 Motor protection [230]
This function protects the motor against overload based on
the standard IEC 60947-4-2. For general information on
different alarm settings, see section 7.3, page 55.
Predictive I
2
t function
Based on how much the used thermal capacity (I
2
t) has
increased during the most recent starts, a prediction of the
next start is made. If there is no room for another start, the
start will be delayed until a start attempt results in a successful
start (estimated motor temperature is cooled down). This
delay time is indicated by the two LED´s “Trip” and “Run”
are slowly flashing (1 Hz) simultaneously, see also Chapter
6.2 page 44.
In addition to this, the message “Used Th Cap” will be shown
in the display if no key on the control panel is pressed within
15 seconds.
Motor I
2
t Alarm [231]
This function makes it possible to protect the motor from
overload as published in the standard IEC 60947-4-2.
The alarm limit is set according to the levels defined by the
“Motor I
2
t Class” in menu [2313]. Once exceeded, an alarm
will occur and the action chosen in menu [2311] is
performed. The alarm remains active until the I²t value is
below 95% before allowing a reset or an autoreset (see more
detailed description in menu [2521]).
Motor I
2
t Alarm Action [2311]
Motor I
2
t Current [2312]
This menu enables both downrating and uprating (use of
motors with a service factor >1.00) of the thermal motor
protection.
WARNING!
If level-control is used (i.e. “Level” selection
in menu [21A]), the motor will automatically
continue to make a new start attempt,
without notice.
Default: Soft Trip
No action 0 I
2
t motor protection is not active.
Hard Trip 1
For a definition, see Table 23, page 55 Soft Trip 3
Warning 4
Default: 100%
Range:
0-150% of the nominal motor current
I
n_mot
[224]
2311 Mot I
2
t AA
Stp M1: Soft Trip
2312 Mot I
2
tCurr
Stp M1: 100%