[fo_tripping-time-overload, 1, en_US]
with
τ
TIME CONSTANT
(address 4203)
k
49 K-FACTOR
(address 4202)
Ι
Nom
Nominal device current in A
Ι
Fault current through phase in A
Ι
pre
Prefault current
Θ
Nom
Temperature at nominal current
Ι
Nom
(address 4209
49 TEMP. RISE I
)
Θ
k
Coolant temperature input (scaling with address 4209 or 4210)
Example:
Maschine:
Ι
Nom Mach
= 483 A
Ι
max Mach
= 1.15
Ι
Nom
at Θ
k
= 40 °C
Θ
Nom Mach
= 93 °C Temperature at
Ι
Nom Mach
τ
th
= 600 s (thermal time constant of the machine)
Current transformer: 500 A/1 A
[einstellwert-k-111-260602-kn, 1, en_US]
[einstellwert-temperatur-100-260602-kn, 1, en_US]
Motor Starting Recognition
The motor starting is detected when setting
I MOTOR START
at address 1107 is exceeded. Information on
how to perform the configuration is given under "Recognition of Running Condition (only for motors)" in
Subsection
Settings
Addresses which have an appended “A” can only be changed with DIGSI, under “Additional Settings”.
The table indicates region-specific presettings. Column C (configuration) indicates the corresponding secon-
dary 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
2.11.3
Functions
2.11 Thermal Overload Protection 49
178
SIPROTEC 4, 7SJ62/64, Manual
C53000-G1140-C207-8, Edition 08.2016
Summary of Contents for SIPROTEC 4
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