Siemens soft starter 3RW44 diagnostic message and warning group failure

Siemens soft starter 3RW44 diagnostics and messages ●Message: Check voltage Cause/solution: The power supply voltage has not been applied. ●Message: Check line phase Cause/solution: Option 1. The power supply voltage has been applied, but the motor has not been connected or is not connected properly. Reason 2. The motor is correctly connected, but there is no phase voltage. ●Message: Ready to start Cause/solution: Siemens soft starter 3RW44 is ready (mains voltage is applied and the motor is correctly connected). The motor will start immediately after issuing the start command. ●Message: Start function has been activated

Cause/solution: The motor starts in the selected starting mode. ●Message: Motor is running Cause/solution: The soft starter is in bypass mode (bypass contactor). Startup is complete.

●Message: Coast to stop is activated

Cause/solution: The motor stops using the selected coasting method.

●Message: Motor cooling time has been activated (for devices with Siemens soft starter 3RW44 version lower than *E06*)

Cause/solution: After the thermal motor model is overloaded and tripped, the motor cannot be started within a certain period of time (parameter: "recovery time") to ensure that the motor can cool down.

●Message: Switching element cooling time (for devices with Siemens soft starter 3RW44 version lower than *E06*)

Cause/solution: After the equipment self-protection mechanism triggers a trip due to overload, the motor will not start for 30s to ensure that the equipment cools down.

●Message: Emergency start activation

Cause/solution: The emergency start function has been activated.

●Message: Quick stop activation

Cause/solution: The quick stop function has been activated.

Siemens soft starter 3RW44 warning and group failure

①Warning, ②Failure but do not restart, ③Failure and restart

●Message: No power supply voltage

①, ②X, ③

Cause/solution:

1. Although the power supply voltage has not been applied, a start command has been issued. Solution: switch on the power supply voltage.

2. If the soft starter displays this message in bypass mode, it may generate "Prewarning limit-motor heating", "Remaining time for tripping" or "Ie limit exceeded/undershot" (Ie limit exceeded/undershot) warning caused the message to be generated by mistake (it can also be traced through the entry in the log/event).

Solution: Please refer to the corresponding message description.

3. Even if the stop (not "coast stop") is parameterized, the supply voltage will be removed with the "ON" command.

Solution: Activate the line contactor through the output parameterized as "ON" time, or parameterize the "coast stop".

●Message: Start condition error (for devices with soft starter version lower than *E04*), phase angle control failure (for devices with soft starter version *E04* or higher)

①, ②X, ③

Cause/solution:

1. Failure occurs without motor starting.

Reason: The motor is not connected correctly, the inner delta circuit is configured incorrectly, and there is a ground fault.

Solution: Check the wiring and correct the wiring problem (see the relevant circuit suggestions for the inner delta circuit).

2. A failure occurred during startup.

Reason: the selected starting voltage is too high, the starting pulse setting is wrong: the motor starts unstable (the starting pulse can only be set when it is really needed. For example, for the pump, the starting pulse usually causes the start to fail.) If the idle time from the last start is <5 s, the Siemens soft starter 3RW44 will start with a higher start voltage. Combined with the set start pulse, it will cause "start condition error".

Solution: Adjust parameters or extend idle time.

●Message: Phase failure L1, L2, L3

①, ②X, ③

Cause/solution:

Option 1: Phases L1, L2, L3 are missing or faults occur during motor operation, and the voltage dip during start-up lasts for more than 100ms and exceeds 15% of the allowable rated working voltage or exceeds the allowable rated working voltage for more than 200ms in bypass mode 15% of it will cause a trip.

Solution: Connect L1, L2, L3 or solve the voltage drop problem.

Reason 2: The connected motor is too small and it will malfunction when switching to bypass mode.

Solution: Set a suitable rated working current for the connected motor, or set it to the minimum value (if the motor current is less than 10% of the set Ie, the motor cannot be operated by the soft starter).

Reason 3: Soft starter used in IT system with ground fault monitoring function: 3RW44 (product version＜*E06* and PROFIBUS DP communication module cannot be used in this network configuration.

Solution: Replace the soft starter with 3RW44 whose product version is *E07* or higher. At this time, it can be used in conjunction with the PROFIBUS DP communication module. However, the phase voltage value (UL-N) and phase-to-phase voltage value (UL-L) may be incorrectly displayed in the measured value display of the Siemens soft starter 3RW44.

●Message: Load phases T1, T2, T3 are missing

①, ②X, ③

Cause/solution:

Motor phases T1, T2, T3 are not connected.

Solution: Connect the motor correctly.

●Message: Power supply voltage is lower than 75%

①, ②X, ③

Cause/solution:

The control power supply voltage is lower than 75% of the required rated voltage and lasts for more than 100 ms (voltage failure, voltage dip, control power supply voltage error).

Solution: Check the control power supply voltage.

●Message: Power supply voltage is lower than 85%

①, ②X, ③

Cause/solution:

The control power supply voltage is lower than 85% of the required rated voltage and lasts for more than 2s (voltage failure, voltage drop).

Solution: Check the control power supply voltage.

●Message: Power supply voltage is higher than 110%

①, ②X, ③

Cause/solution:

The control power supply voltage is higher than 110% of the required rated voltage and lasts for more than 2s (peak voltage, control power supply voltage error).

Solution: Check the control power supply voltage.

●Message: Current imbalance is too serious

①X, ②X, ③

Cause/solution:

The phase current is asymmetric (unbalanced load). When the asymmetry exceeds the limit set by the soft starter (parameter: "Current asymmetry limit value" Current asymmetry limit value), a message will be output.

Solution: Check the load or modify the parameter value.

●Message: Thermal motor model overload

①X, ②X, ③X

Cause/solution:

The thermal motor model has tripped. After an overload trip occurs, restarting is prohibited until the recovery time ends.

Solution in case of accidental trip:

1. Check whether the setting of the rated working current Ie of the motor is correct;

2. Change the CLASS setting of the soft starter;

3. Reduce the switching frequency;

4.Disable motor protection (CLASS OFF).

●Message: Early warning limit-motor heating

①X、②、③

Cause/solution:

The motor heating value is greater than the set parameter value: "Prewarning limit-motor heating". The thermal motor model is close to overload trip, depending on the set value. For the heavy-duty start with the trip level set to ≥ CLASS 20, it is recommended to increase the "Prewarning limit motor heating" parameter of Siemens soft starter 3RW44 to 95%.

●Message: The remaining time of the trip is lower than the lower limit

①X、②、③

Cause/solution:

The time until an overload trip occurs in the thermal motor model is shorter than the set "Prewarning limit-remaining time for tripping" parameter. For the heavy-duty start with the trip level value set to ≥ CLASS20, it is recommended to set the parameter value of "Prewarning limit-remaining time for tripping" to 0s (disabled).

●Message: Line overvoltage (for devices with soft starter version lower than *E04*), line voltage is too high (for devices with soft starter version *E04* or higher)

①, ②X, ③

Cause/solution:

The applied 3-phase line voltage is not suitable for the equipment or voltage peaks appear for a long time. Exceeding 10% of the allowable rated control power supply voltage for more than 500ms will cause a trip. Since the Siemens soft starter version *E02*, the internal trip threshold has been increased to more than 18% (the duration has been extended to more than 2000ms).

Solution: Apply a suitable voltage.

●Message: Out of current measurement range

①, ②X, ③

Cause/solution:

1. There is a very high current (higher than the measurement range of the current transformer integrated in the soft starter). This situation occurs in the following situations: full-pressure start, starting pulse or combined braking.

Solution: For the "voltage ramp" start type, extend the set ramp time and reduce the starting voltage or braking torque. For the motor, the size of the soft starter may be too small.

2. If this message appears during the start-up process, "Prewarning limit-motor heating" (Prewarning limit-motor heating), "Remaining time for tripping" or "Over/Low" may be generated too frequently. "Ie limit exceeded/undershot" (Ie limit exceeded/undershot) warning caused the message to be generated by mistake (it can also be traced through the entry in the log/event).

Solution: Please refer to the corresponding message description.

●Message: Trip-motor blocked (only for equipment with Siemens soft starter version lower than *E07*)

①, ②X, ③

Cause/solution:

In the bypass mode, a very high current suddenly appears, for example when the motor is locked (I>4xIe motor, and lasts for more than 100ms).

Solution: Check the motor.

●Message: A protective trip has occurred in the bypass element (for devices with soft starter version *E07* or higher)

①, ②X, ③

Cause/solution:

Very high currents appear in bypass mode. The tripping operation depends on the duration and intensity of the current. Only after 30s can the fault be reset (need to cool down within this time period).

Solution: Check the specifications of the motor and soft starter.

The above are the diagnostic messages and warning group failures of Siemens soft starter 3RW44, I hope to help you. You can log in to the okplazas.com motor mall to view Siemens related products, welcome to email: okplazas.com for consultation, and you can also contact WeChat customer service +86-13689242098 online for product consultation!