Description of the Software Modules and Parameters
Parameter manual
b maXX
BM3000
Document no.: 5.12001.07
733
4
tion of the l
2
t actual value 100%
155°C (if the continuous operation is determined by
the winding temperature and an environmental temperature of = 40°C is assumed).
I
2
t-Monitoring
Figure 228:
Motor I
2
t overload monitoring (standard solution)
The motor overload monitoring is active if the motor l
2
t time constant
is unequal
zero.
If the motor l
2
t actual value at activated motor overload monitoring reaches the l
2
t warning
limit
, the motor warning number 219 "l2t warning limit exceeded" is displayed.
The warning is withdrawn by a fixed hysteresis of 10% under the warning threshold. If the
warning threshold is 0 no warning occurs.
Initialization of the PT
1
element
As soon as the l
2
t actual value reaches the threshold
the pulse inhibit is activated
and the motor error 205 "l2t overload" is displayed.
The PT
1
element of the l
2
t model is generally initialized with the motor temperature
. If the motor temperature is detected by a sensor and the temperature evalua-
tion is activated in the controller (refer to parameter
Temperature acquisition
system), at the activation of the overload monitoring the PT
1
element is initialized to the
increase of the measured motor temperature T
m
over the maximum environ-
mental temperature (40°C) (an insulation class F is assumed). The error 205 "l2t over-
load" can therefor occur when switching on even though the current is low.
+
-
N
D
N
D
=0
0%
=0
Ref
I
PT1
6.28
5000_0356_rev01.cdr
1 / 155°C
0
40°C
Tm
T
t
6.29
6.39
N
I ,107.9
Warning no. 219
I2t warning
threshold
exceeded
Motor error
error no. 205
I2t overload
Motor
I2t time constant
107.28
Motor I2t actual value
Motor nominal current
Motor temperature
Tm (P0503)
Apparent
current actual
value, Iact
'
drive status = 0,
or activation: 107.28 from 0 to = 0
I2t threshold
I2t warning threshold
Motor
I2t time constant
107.28
Initialization
Iact
'
I value
2
10% hysteresis
NOTE!
If there is no motor temperature sensor available or activated then after an interrup-
tion and restarting of the l
2
t model again it cannot recognize a warm motor. In this
case the l
2
t model assumes a cold motor if it is started.
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