Warning Elements
By setting the thermal warning element 49 Θ ALARM (address 4204), a warning message can be issued
before reaching the tripping temperature. Tripping can thus be avoided by initiating early load reduction
measures. This warning element simultaneously represents the dropout level for the trip signal. Only when
this threshold is undershot, the tripping command will be reset and the protected equipment can be switched
on again.
The thermal element level is given in % of the tripping overtemperature.
A current warning level is also available (parameter 4205 I ALARM). The setting is set as the secondary
current in A (mperes) and should be equal to or slightly less than the permissible current k · Ι
Nom sec
. It can be
used instead of the thermal warning element by setting the thermal warning element to 100 % thus virtually
disabling it.
Dropout Time after Emergency Starting
This function is not required for protection of lines and cables. Since it is activated by a binary input message,
parameter T EMERGENCY (address 4208) is not in effect. The factory setting can be retained.
Settings
Addresses which have an appended “A” can only be changed with DIGSI, under “Additional Settings”.
The table indicates region-specific default settings. Column C (configuration) indicates the corresponding
secondary nominal current of the current transformer.
Addr.
Parameter C Setting Options Default Setting Comments
4201 FCT 49 OFF
ON
Alarm Only
OFF 49 Thermal overload
protection
4202 49 K-FACTOR 0.10 .. 4.00 1.10 49 K-Factor
4203 TIME CONSTANT 1.0 .. 999.9 min 100.0 min Time Constant
4204 49 Θ ALARM 50 .. 100 % 90 % 49 Thermal Alarm Stage
4205 I ALARM 1A 0.10 .. 4.00 A 1.00 A Current Overload Alarm
Setpoint
5A 0.50 .. 20.00 A 5.00 A
4207A Kτ-FACTOR 1.0 .. 10.0 1.0 Kt-FACTOR when motor
stops
4208A T EMERGENCY 10 .. 15000 sec 100 sec Emergency time
Information List
No.
Information Type of
Informa-
tion
Comments
1503 >BLOCK 49 O/L SP >BLOCK 49 Overload Protection
1507 >EmergencyStart SP >Emergency start of motors
1511 49 O / L OFF OUT 49 Overload Protection is OFF
1512 49 O/L BLOCK OUT 49 Overload Protection is BLOCKED
1513 49 O/L ACTIVE OUT 49 Overload Protection is ACTIVE
1515 49 O/L I Alarm OUT 49 Overload Current Alarm (I alarm)
1516 49 O/L Θ Alarm OUT 49 Overload Alarm! Near Thermal Trip
1517 49 Winding O/L OUT 49 Winding Overload
1521 49 Th O/L TRIP OUT 49 Thermal Overload TRIP
1580 >RES 49 Image SP >49 Reset of Thermal Overload Image
2.10.3
2.10.4
Functions
2.10 Thermal Overload Protection 49
152 SIPROTEC 4, 7SJ80, Manual
E50417-G1140-C343-A8, Edition 12.2017
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