Lenze ECSCx Axis cold plate - Manual (Page 85)

Safety instructions
Thermal motor monitoring
Self−ventilated motors
2
l
85 EDKCSCX064 DE/EN/FR 4.0
Calculate release time and I 2 x t load
Calculate the release time and the I 2 x t load of the motor considering the values
in C0129/1 and C0129/2(evaluation coefficient "y").
Formulae for release time Information
y +
100% * C0129ń1
C0129 ń2
n
n
N
) C0129ń1
T + * ( t ) ln
ȧȧ
ȡ
Ȣ
1 * z ) 1
ǒ
IMot
y I
N
Ǔ
2
100
ȧȧ
ȣ
Ȥ
T Release time of the I 2 x t
monitoring
t Thermal motor time constant
(C0128)
In Function: Natural logarithm
I Mot Actual motor current (C0054)
I
r
Rated motor current (C0088)
z Threshold value in C0120 (OC6) or
C0127 (OC8)
y Evaluation coefficient
n
rated
Rated speed (C0087)
Formulae for I 2 x t load Information
L(t) +
ǒ
I
Mot
y I
N
Ǔ 2
100%
ǒ
1 * e
*t
t
Ǔ
L(t) Chronological sequence of the
I
2 x t load of the motor
(Display: C0066)
y Evaluation coefficient
I Mot Actual motor current (C0054)
Ir Rated motor current (C0088)
t Thermal motor time constant
(C0128)
If the controller is inhibited, the I 2 x t load is reduced:
L(t) + L
Start
e * tt
Ǹ
L
Start
I 2 x t load before controller inhibit
If an error is triggered, the value
corresponds to the threshold
value set in C0120 (OC6) or C0127
(OC8).