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4.28
Restart Inhibit for Motors (ANSI 66, 49
Setting Ranges/
Increments
Restart Threshold
RestartTimes
7UM62 Manual
C53000-G1176-C149-3
Starting CurrentBased
on Nominal Motor Current
Max. Permissible
Starting Time
Temperature
Equalization Time
Max. Permissible
Number of Warm Starts
Difference between
Cold and Warm Starts
Extension of Time
Constant at Stop
Extension of Time
Constant at Motor Running
Minimum Restart Inhibit Time
Meaning:
4.28 Restart Inhibit for Motors (ANSI 66, 49
Rotor
I
/I
1.5 to 10.0
Start
MOTnom
T
3.0 s to 120.0 s
MOT START
T
0.0 min to 60.0 min (Increments 0.1 min)
EQUAL
n
1 to 4
WARM
n
- n
1 to 2
COLD
WARM
kτ
1.0 to 100.0
STOP
kτ
1.0 to 100.0
RUNNING
0.2 to 120.0 min
Θ
Θ
⋅
=
Re.Inh
L max perm
T
T
T
=
+
Wait time
Equal
Re.In.
Θ
τ ln
⋅
Hist
T
=
(
------------------
)
Θ
Re.Inh
Re.Inh
Θ
Temperature threshold below which a
Re.Inh.
restart is possible
Θ
Maximum permissible rotor
L max perm.
overtemperature (= 100 % in operational
measured value Θ
n
Number of permissible starts in cold
COLD
condition
T
Time after which a restart of the motor is
Wait time
possible
T
Equalization time during which the thermal
Equal
replica is "frozen"
T
Time for the thermal replica to drop below
Re.Inh.
the restart threshold again, depends on:
Θ
History leading to the rotor temperature
Hist
τ
Rotor time constant (internally calculated)
)
(Increments 0.1)
(Increments 0.1 s)
(Increments 1)
(Increments 1)
(Increments 0.1)
(Increments 0.1)
(Increm. 0.1 min)
n
–
1
COLD
-------------------------- -
n
COLD
Θ
⋅
n
τ ln
⋅
Hist
COLD
=
(
---------------------------------- -
)
n
1
–
COLD
/Θ
)
R
R Trip
)
Rotor
443
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