Functions
7.4 Motor protection
SIRIUS 3RW55 soft starter
110 Manual, 08/2018, A5E35630887002A/RS-AB/002
Parameters
WARNING
Automatic restart following fault acknowledgement/restart.
Will cause death or serious injury.
The 3RW55 soft starter immediately continues to operate with the values specified by the
control following fault acknowledgement/restart. Outputs are activated when the ON
condition is met.
Take appropriate measures (e.g. start key with monitored start) to prevent unintentional
restarting and to ensure a defined start of the system.
Parameters Description
Response to overload
thermal motor model
Use this device parameter to specify how the 3RW55 soft starter is to
behave in the event of motor overload:
• Trip without restart (factory setting)
On the occurrence of the motor overload, an error message is
generated and the motor is tripped. When the parameterized
recovery time (cooling time) has elapsed, the fault message and
the trip can be acknowledged with the "Reset" function.
• Trip with restart
On the occurrence of the motor overload, an error message is
generated and the motor is tripped. When the parameterized
recovery time (cooling time) has elapsed, the fault message and
the motor trip are automatically canceled.
Tripping class Deactivates motor overload protection. You can find additional
information below the table.
• CLASS OFF
The tripping times correspond to the trip class. You can find additional
information below the table.
• CLASS 10A
• CLASS 10E (factory setting)
• CLASS 20E
• CLASS 30E
Recovery time Minimum cooling down time for the motor after an overload trip. Reset
signals present during the recovery time have no effect.
• Factory setting: 300 s
• Setting range: 60 ... 1 800 s
• Increment: 30 s
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