Asymmetry - Siemens SIRIUS 3RW55 Equipment Manual

Functions

8.9 Asymmetry

Parameters
Pump cleaning - time
Pump cleaning - cycles
Pump cleaning - start/stop parameters
8.9 Asymmetry
Operating principle
In certain phases of the motor, an asymmetrical current consumption can cause a reduction in
power or damage to the motor. Possible causes for this are a different line or phase voltage or an
already damaged motor winding. The asymmetry monitoring monitors the 3 phase currents and
issues a warning or switches the motor off at parameterizable limits. The current asymmetry can
be displayed via the measured value "Asymmetry" (Page 227)
186
Description
During the cleaning time, the pump runs at reduced speed and the maximum
possible torque.
• Factory setting: 20 s
• Setting range: 1 ... 30 s
• In steps of: 1 s
During a cycle, the pump rotation changes direction several times.
For parameter values "Pump cleaning - cycles" > 1, the following applies: After
⑧
completion of the cycle
number of cycles is reached. The "Starting"
ued.
• Factory setting: 3
• Setting range: 1 ... 10
• In steps of: 1
You can select the parameters for starting and stopping the pump for different
cleaning processes here. For example, you can make different settings for
starting and stopping in parameter set 2 than for the normal starting and
stopping procedure.
Parameter set 1
The pump cleaning function is carried out with the starting and stopping pa‐
rameters of parameter set 1.
Parameter set 2
The pump cleaning function is carried out with the starting and stopping pa‐
rameters of parameter set 2.
Parameter set 3
The pump cleaning function is carried out with the starting and stopping pa‐
rameters of parameter set 3.
Operating parameters (factory setting)
The pump cleaning function is carried out with the starting and stopping pa‐
rameters of the currently selected parameter set.
Equipment Manual, 02/2022, A5E35630887002A/RS-AF/006
③
, the cleaning operation
⑨
mode is then normally contin‐
SIRIUS 3RW55 and 3RW55 Failsafe Soft Starters
is repeated until the set