6 Special device functions
66 2011-07-01/00561073 [SCR Power Controller TYA202]
Overcurrent
The specifications in % refer to load current changes
Temperature
coefficient (TC)
For heating elements with large positive or negative temperature coefficients it
is necessary to determine a suitable limit value yourself. It helps to monitor the
value of the current percentage deviation from the teach-in values. This value
is displayed in the operator level in the configuration window for the limit value
(Operator level
➔ Monitoring ➔ Limit value load monit.) in the bottom line:
Number of
heating ele-
ments
Star connec-
tion without
neutral conduc-
tor
Delta connection
6 -
-
5 10%
-
4 10% 10%
3 14% 13%
2 25% 26%
Example for 2
heating ele-
ments
No load monitoring takes place during the soft start phase (that can take longer
when current limiting is active) as the standard operating range of the load is not
yet reached. Teach-in cannot be performed in this phase either.
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