Restart Inhibit For Motors (Ansi 66, 49Rotor) - Siemens Siprotec 7UM611 Manual

4 Technical Data
4.20

Restart Inhibit for Motors (ANSI 66, 49Rotor)

Setting Ranges / Increments
Restart Threshold
Restart Times
334
Motor starting current relative to Nominal
Motor Current
I /I
Start Motor Nom
Max. admissible Startup Time
T
Start Max
Leveling Time
T
LEVEL
Maximum admissible Number of Warm Starts
n
WARM
Difference between Cold and Warm Starts
n – n
Cold Warm
Extension Factor at Standstill
k
τ STANDSTILL
Extension Factor on Motor Operation
k
τ OPERATION
Minimum Restart Inhibit Time
Significance:
Θ
Temperature limit below which a restart is possible
Re.Inh.
Θ
maximum admissible rotor overtemperature (= 100 % of operational
L max adm
value Θ
n number of admissible starts from cold
cold
T Time after which motor may be reswitched on
Wait Time
T Leveling time during which the thermal replica is "frozen"
Leveling
T Time until the thermal replica is again below the restart threshold
Re.Inh.
depends on:
Θ
Rotor temperature past history
Hist
t Rotor time constant, internally calculated
1.5 to 10.0
3.0 s to 120.0 s
0.0 min to 60.0 min
1 to 4
1 to 2
1.0 to 100.0
1.0 to 100.0
0.2 to 120.0 min
/Θ from)
L L
Increments 0.1
Increments 1 s
Increments 0.1 min
Increments 1
Increments 1
Increments 0.1
Increments 0.1
Increm. 0.1 min
7UM61 Manual
C53000-G1176-C127-3