Parameters
Index.Subindex
Name
Data type
6333
0x216A.1F
Actual value relative I²t monitoring of power
output stage at standstill to limit
FLOAT32
6334
0x216A.20
Actual value I²t monitoring of the total current FLOAT32
Tab. 159 Objects
3.4.2
I²t monitoring of motor
To protect the connected motor from thermal overload, a simplified thermal motor model is used for
the CMMT-ST. The simplified thermal motor model is based on a deceleration member of the first
order with a standardised status variable of 0 to 1 and a parameterisable filter time constant of
Px.7144
è
3.3.1 Motor configuration. If the deceleration member reaches the value 1, this means that
the motor is permanently operated with nominal current. If the value 1.05 of the status variable is
reached, a diagnostic message is emitted. Between 0 and 1, a warning threshold can be paramet-
erised.
Timing
Fig. 39 Timing of I²t monitoring of motor
Name
Description
Error limit
Px.6306, Limit value I²T monitoring motor model
Warning limit
Px.6305, Scaling factor warning limit I²t monitoring motor model
Product configuration
188
Festo — CMMT-ST-SW — 2019-02
Summary of Contents for CMMT-ST-SW
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