Lenze EVF9383 - Manual (Page 28)

Safety instructions
Thermal motor monitoring
Parameter setting
2
2.2
2.2.2
l
2.2−2 EDSVF9383V EN 7.1−04/2012
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
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.
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. 2.2−1 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
Calculating the release time
Reading the release time off
the diagram