Siemens SIRIUS 3RW55 - Page 180

Messages and diagnostics
8.4 Faults and remedial actions of the 3RW55 soft starter
SIRIUS 3RW55 soft starter
180 Manual, 08/2018, A5E35630887002A/RS-AB/002
Faults
Cause
Remedy
Asymmetry tripping
Additional tripping in the case of asymmetry
-
Above threshold I The current has exceeded a limit. Check the application driven by the
motor.
Below threshold I
The current has undershot a limit.
Current fault limit disconnection Additional tripping in the event of a current
fault limit overshoot or undershoot.
-
Ground fault The ground-fault monitoring has responded.
An impermissibly high residual current is
flowing.
Check the connecting cable of the
motor for damage.
Electronics supply voltage too low The supply voltage is below the permitted
value.
Check the power supply (load rating,
voltage range).
Bus error Fault in the fieldbus communication.
You will find
further information in the manual
for the 3RW5 communication module in
question.
-
Process image error The process image output (PIQ) contains
invalid control bit combinations (e.g. control
bits for clockwise and counter-clockwise
rotation are set at the same time).
Check and correct the process image
output (PIQ).
Parameter fault The module is not or is incorrectly
parameterized or parameterization changes
are denied in current operating mode.
• Correct and execute
parameterization.
• Switch the operating mode and
repeat parameterization.
Missing startup parameters Necessary startup data for the device are
missing.
Check parameterization or startup data
records.
Device error Unrecoverable error detected after internal
diagnostics (self-test, contactor contacts,
switching element, etc.).
Replace the device.
Module slot wrong or configuration
faulty
Real and configured slot of module is
different.
Ensure consistency between plugged
and configured module.
Motor connection variant unknown
or incorrect
The motor connection variant was not
recognized or is different from configuration.
Ensure correct connection.
Zero current after ON command No current flow is detected after the motor
feeder is switched on. Possible causes:
• Main circuit interrupted (fuse, circuit
breaker)
• Motor contactor or contactor control is
defective
• The parameter execution time is too short
• No load
-
Phase failure
• L1
• L2
• L3
The main power monitoring detects a phase
failure.
-
Overvoltage The supply voltage is above the tolerance
limit.
Change the power supply.
Bypass defective - Check bypasses for L1, L2 and L3 and
replace defective bypasses.