Functions
2.8 Motor Protection
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
180
2.8.4
Motorprotection (Motor Starting Protection 48, Motor Restart Inhibit 66,
LoadJam)
Functions relevant to Motor Protection and Restart Inhibit for Motors and Load Jam Protection are described
in the aforegoing two sections and contain information concerning configuration.
2.8.4.1
Settings
The table indicates region-specific default settings. Column C (configuration) indicates the corresponding sec-
ondary nominal current of the current transformer.
Addr.
Parameter
C
Setting Options
Default Setting
Comments
4101
FCT 48/66
OFF
ON
OFF
48 / 66 Motor (Startup
Monitor/Counter)
4102
STARTUP CURRENT
1A
0.50 .. 16.00 A
5.00 A
Startup Current
5A
2.50 .. 80.00 A
25.00 A
4103
STARTUP TIME
1.0 .. 180.0 sec
10.0 sec
Startup Time
4104
LOCK ROTOR TIME
0.5 .. 180.0 sec;
∞
2.0 sec
Permissible Locked Rotor
Time
4105
STARTUP T WARM
0.5 .. 180.0 sec;
∞
10.0 sec
Startup Time for warm
motor
4106
TEMP.COLD MOTOR
0 .. 80 %;
∞
25 %
Temperature limit for cold
motor
4301
FCT 66
OFF
ON
OFF
66 Startup Counter for
Motors
4302
IStart/IMOTnom
1.10 .. 10.00
4.90
I Start / I Motor nominal
4303
T START MAX
1 .. 320 sec
10 sec
Maximum Permissible
Starting Time
4304
T Equal
0.0 .. 320.0 min
1.0 min
Temperature Equalizaton
Time
4305
I MOTOR NOMINAL
1A
0.20 .. 1.20 A
1.00 A
Rated Motor Current
5A
1.00 .. 6.00 A
5.00 A
4306
MAX.WARM STARTS
1 .. 4
2
Maximum Number of
Warm Starts
4307
#COLD-#WARM
1 .. 2
1
Number of Cold Starts -
Warm Starts
4308
K
τ
at STOP
0.2 .. 100.0
5.0
Extension of Time Con-
stant at Stop
4309
K
τ
at RUNNING
0.2 .. 100.0
2.0
Extension of Time Con-
stant at Running
4310
T MIN. INHIBIT
0.2 .. 120.0 min
6.0 min
Minimum Restart Inhibit
Time
4311
ROTOR OVERLOAD
ON
OFF
Alarm Only
ON
Rotor Overload Protection
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