281
Fault tracing
3ADW000379R0501 DCS550 Manual e e
Motor load curve
Using formula (1) we can calculate the correct value for
τ
, when starting with a cold motor.
With:
−
=
Φ
=
−
τ
t
Motn
act
trip
e
I
I
1
*
)
04
.
31
(
2
2
2
Follows:
s
n
s
I
I
n
t
act
Motn
122
7
.
1
0
.
1
*
06
.
1
1
l
60
*
)
04
.
31
(
1
l
2
2
2
2
2
2
=
−
−
=
−
−
=
τ
Set M1ModelTime (31.01) = 122 s.
I
2
T-function (reducing armature current)
The drive is equipped with an I
2
t-function. It uses the ampere value in M1MotNomCur (99.03) as 100 %. All
current depending values are related to this parameter.
The I
2
t-function is enabled if M1OvrLoadTime (31.11) and M1RecoveryTime (31.12) are greater than zero and
the maximum overload current in M1LoadCurMax (31.10) is greater than 100 %.
If M1RecoveryTime (31.12) is set too short compared to M1OvrLoadTime (31.11), A132ParConflict is
generated, see also Diagnosis (9.11).
Ensure that M1OvrLoadTime (31.11) and M1RecoveryTime (31.12) fit to the overload capability of motor and
drive. This must be taken into account during the engineering of the drive system.
Summary of Contents for DCS550 Series
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