100 °C. When the temperature exceeds 100 °C, overtemperature
disconnection takes place.
Above 200% of the continuous torque at standstill an I
2
t limitation starts
. It
limits the temperature of winding and electronics to the safe working range.
In standstill (rotating shaft n < ~ 60 min
-1
), the current is limited in a more
restrictive way, due to the concentration of losses in one phase. For bigger
motors, the continuous torque at standstill can be less than 200% of the
continuous torque at standstill 60 K.
The limitation starts at 100% of thermal controller load. To have reserve
capacity (e.g., for dynamic processes or increased friction), no more than
80% of thermal controller load should be configured for the drive system. The
controller load should be checked during the initial commissioning.
See also "P-0-0141, Thermal drive load"
k
Overload ratio
A)
Rotating shaft n > ~ 60 min
-1
B)
Standstill n < ~ 60 min
-1
Fig. 7-23:
Example of current limitation
To determine the resulting torque or current limitations,
additionally take the motor current limitations into account. See
"KSM02 characteristics" or for KMS02 the data sheet of the motor
used.
7.2.4
Motor temperature
Since the electronics is thermally connected to the motor housing, the
amplifier temperature is the most important load variable. This temperature is
measured and can be read as parameter "S-0-0384, Amplifier temperature".
It is slightly higher than the housing temperature and should not exceed
100 °C. Operation under rated conditions causes temperature rise of 60 K.
The product of the square of the current and the time results in a constant
IndraDrive Mi Drive Systems with KCU02, KSM02,
KMS02/03, KMV03, KNK03, KLC03
247/407
Notes on project planning
R911335703_Edition 04 Bosch Rexroth AG
