2 parameter setting, Parameter setting, Ȧȡ ȣ – Lenze EVF9338 User Manual
Page 67: Ȧȣ ȥ, Safety instructions, Thermal motor monitoring parameter setting, Calculating the release time
Safety instructions
Thermal motor monitoring
Parameter setting
l
67
EDKVF9338 DE/EN/FR 4.0
2.2.2
Parameter setting
Parameter setting
Code
Meaning
Value range
Lenze setting
C0066
Display of the I
2
xt utilisation of the motor
0 ... 250 %
−
C0120
Threshold: Triggering of an "OC6" error
0 ... 120 %
0 %
C0127
Threshold: Triggering of an "OC8" error
0 ... 120 %
0 %
C0128
Thermal time constant of the motor
0.1 ... 50.0 min
5.0 min
C0606
Response to "OC8" error
Trip, warning, off
Warning
Calculating the release time
t
+ * (C0128) @ ln
ȧ
ȡ
Ȣ
1
*
y
) 1
ǒ
IM
Ir
Ǔ
2
@ 100
ȧ
ȣ
Ȥ
I
M
Actual motor current
I
r
Rated motor current
y
C0120 or C0127
ƒ
The thermal capacity of the motor is expressed by the thermal motor time factor
(C0128). Please see the rated data of the motor for the value or ask the
manufacturer of the motor.
Reading the release time off the diagram
Diagram for the determination of the release times of a motor with a thermal motor time
factor of 5 min:
I
= 3 × I
mot
r
0
50
100
120
0
100
200
300
400
500
600
700
800
900
1000
t [s]
I t [%]
2
I
= 2 × I
mot
r
I
= 1.5 × I
mot
r
I
= 1 × I
mot
r
9300std105
Fig. 2−1
I
2
× t−monitoring: Release times for different motor currents and trigger thresholds
Imot
Motor current
I
r
Rated motor current
I
2
t
I
2
t load
T
Time