Creep Speed; Creep Speed (Page 172) - Siemens SIRIUS 3RW55 Equipment Manual

Functions

8.5 Creep speed

The behavior of the soft starter after an acknowledgment depends on the "Response to
overload ..." parameter set for the particular function. You can set the behavior of the "intrinsic
device protection" function via the menu "Additional parameters", see Chapter "Functions under
"Additional parameters" (Page 214)".
8.5 Creep speed
Operating principle
The "Creep speed" function enables the motor to be controlled at low speed in both directions
during operation. The result of this function, however, is that only a reduced torque can be
generated in the motor. Due to possible temperature rise of the motor, this function is not
suitable for continuous operation. As motor protection, the use of the thermistor motor
protection with temperature sensor (Page 169) is recommended. Furthermore, the creep speed
causes mechanical vibrations, which can reduce the lifetime of the bearings. In addition to the
set parameters, motor-specific characteristics and the connected load influence the speed
resulting from the "Creep speed" function and creep speed generated in the motor. The "creep
speed" function is active for as long as the "Creep speed" control command is set.
You will find more information in chapter 3RW55 soft starter in standard (inline) circuit with soft
starting, soft stopping and the additional function "Creep speed" (Page 315).
Application
• In applications with a low counter-torque, e.g. positioning of machine tools.
Validity
This function is not available for the 3RW55 Failsafe soft starter.
Setting options
• 3RW5 HMI High Feature
Menu: "Parameters > Soft Starter > Parameter set 1 / 2 / 3 > Creep speed"
Access protection to the 3RW5 HMI High Feature is not active or has been reset.
• With SIRIUS Soft Starter ES (TIA Portal) via the local interface on the 3RW5 HMI High Feature
Brief overview: Window "Project Navigation" with current project under created Soft Starter
> "Parameters" > Window "Work area" >"Soft Starter > Parameter set 1 / 2 / 3 > Creep speed"
• With a fieldbus via a 3RW5 communication module:
– With SIRIUS Soft Starter ES (TIA Portal) Premium / Professional (only via a 3RW5 PROFINET
– Configuration software of the control system (e.g. STEP 7 with corresponding HSP)
– User program
You can find additional information on the parameters that can be set via the fieldbus in the
manual of the respective 3RW5 communication module.
172
or PROFIBUS communication module)
Brief overview: See SIRIUS Soft Starter ES (TIA Portal) via the local interface on the
3RW5 HMI High Feature
SIRIUS 3RW55 and 3RW55 Failsafe Soft Starters
Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006