[formel-lastsprung-motorbeispiel, 1, en_US]
The tripping delay time can remain at the default setting of 1 s. The warning threshold is set to 75% of the
tripping element (4404 I Alarm ≡ 0.95 A sec.).
The tripping delay time can remain at the default setting of 2 s.
In order to block the function during motor startup, the parameter 4406 T Start Blk. is set to double
startup time (T Start Blk. = 2 · 8.5 s = 17 s).
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.
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
4101 FCT 48 OFF
ON
OFF 48 Startup Time Supervi-
sion for Motors
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 Kτ at STOP 0.2 .. 100.0 5.0 Extension of Time Constant
at Stop
4309 Kτ at RUNNING 0.2 .. 100.0 2.0 Extension of Time Constant
at Running
4310 T MIN. INHIBIT 0.2 .. 120.0 min 6.0 min Minimum Restart Inhibit
Time
2.8.4
2.8.4.1
Functions
2.8 Motor Protection
SIPROTEC 4, 7SJ62/64, Manual 161
C53000-G1140-C207-8, Edition 08.2016
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