4.8.2
Thermal Overload – Settings via DiggiMEC or via Smart view
⚙
1. ▷
Activate the protection stage and select whether it shall operate as a supervision or a
protection function, see ╚═▷ “4.1 »Prot« – General Protection Module”.
2. ▷
Specify the base current. This is the maximum permissible thermal continuous current:
• [Protection Para / ThR] »ThR . Ib« — as a number value in units of the nominal•
current In.
3. ▷
Specify the Overload Factor. This is a number without unit, and when it is multiplied
with the base current then the result is the maximum thermal limit:
• [Protection Para / ThR] »ThR . K« — as a number value without a unit.•
4. ▷
Specify the warming-up time constant and the cooling time constant:
• [Protection Para / ThR] »ThR . τ-warm« — as a time value in seconds.•
• [Protection Para / ThR] »ThR . τ-cool« — as a time value in seconds.•
5. ▷
Specify the Pre-Alarm level (see the description at the beginning of this chapter):
• [Protection Para / ThR] »ThR . Pre-Alarm Lev.« — as a percentage.•
6. ▷
Select a criterion that denes the initial value of the thermal capacity in case of a
device restart:
• [Protection Para / ThR] »ThR . Initial Thermal Level« =•
Options:
◦ “Zero” — The initial value is set to zero.◦
◦ “Last Stored Value” — The initial value is set to the last known value but◦
limited to max. 95%. (Without the limit, a restart after a thermal trip, i. e. a
trip with θ ≥ 100 %, would use an initial value ≥ 100 %, so that the Thermal
Overload protection would immediately trip again.)
162 WIC1 WIC1-1.0-EN-MAN
4 Protective Elements
4.8.2 Thermal Overload – Settings via DiggiMEC or via Smart view
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