Forced ventilated or naturally ventilated motors, Ȧȧ ȡ ȣ, Ȧȧ ȣ ȥ – Lenze ECSDAxxx User Manual
Page 83: Safety instructions
Safety instructions
Thermal motor monitoring
Forced ventilated or naturally ventilated motors
l
83
EDKCSDX064 DE/EN/FR 3.0
2.2.1
Forced ventilated or naturally ventilated motors
Parameter setting
The following codes can be set for I
2
x t monitoring:
Code
Meaning
Value range
Lenze setting
C0066
Display of the I
2
x t load of the motor
0 ... 250 %
−
C0120
Threshold: Triggering of error "OC6"
0 ... 120 %
0 %
C0127
Threshold: Triggering of error "OC8"
0 ... 120 %
0 %
C0128
Thermal motor time constant
0.1 ... 50.0 min
5.0 min
C0606
Response to error "OC8"
TRIP, warning, off
Warning
Calculate release time and I
2
x t load
Formula for release time
Information
t
+ * ( t ) ln
ȧȧ
ȡ
Ȣ
1
*
z
) 1
ǒ
IMot
IN
Ǔ
2
100
ȧȧ
ȣ
Ȥ
I
Mot
Actual motor current (C0054)
I
r
Rated motor current (C0088)
t
Thermal motor time constant
(C0128)
z
Threshold value in C0120 (OC6) or
C0127 (OC8)
Formulae for I
2
x t load
Information
L(t)
+
ǒ
I
Mot
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)
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).