Siemens Siprotec 7UM612 - Restart Inhibit for Motors (ANSI 66, 49 Rotor)

4 Technical Data
334
7UM61 Manual
C53000-G1176-C127-3
4.20 Restart Inhibit for Motors (ANSI 66, 49Rotor)
Setting Ranges / Increments
Restart Threshold
Restart Times
Motor starting current relative to Nominal
Motor Current
I
Start
/I
Motor Nom
1.5 to 10.0 Increments 0.1
Max. admissible Startup Time
T
Start Max
3.0 s to 120.0 s Increments 1 s
Leveling Time
T
LEVEL
0.0 min to 60.0 min Increments 0.1 min
Maximum admissible Number of Warm Starts
n
WARM
1 to 4 Increments 1
Difference between Cold and Warm Starts
n
Cold
– n
Warm
1 to 2 Increments 1
Extension Factor at Standstill
k
τ STANDSTILL
1.0 to 100.0 Increments 0.1
Extension Factor on Motor Operation
k
τ OPERATION
1.0 to 100.0 Increments 0.1
Minimum Restart Inhibit Time 0.2 to 120.0 min Increm. 0.1 min
Significance:
Θ
Re.Inh.
Temperature limit below which a restart is possible
Θ
L max adm
maximum admissible rotor overtemperature (= 100 % of operational
value Θ
L
/Θ
L
from)
n
cold
number of admissible starts from cold
T
Wait Time
Time after which motor may be reswitched on
T
Leveling
Leveling time during which the thermal replica is "frozen"
T
Re.Inh.
Time until the thermal replica is again below the restart threshold
depends on:
Θ
Hist
Rotor temperature past history
t Rotor time constant, internally calculated
www . ElectricalPartManuals . com