Siemens power module repair (Dihao)

Siemens power module maintenance

Common faults of Siemens 6SN1145 power drive module maintenance: no display maintenance, phase loss maintenance, inability to start maintenance, overcurrent maintenance, overvoltage maintenance, undervoltage maintenance, overheating maintenance, overload maintenance, grounding maintenance, parameter error maintenance, display without output maintenance, alarm maintenance. 6SN1145 servo power supply professional maintenance quick repair power supply trips, yellow light does not light up, phase loss, undervoltage, overvoltage, module explosion, no output, low output voltage, no output point, red light on, no response when starting, unable to start repair, no display repair, switch power supply damage repair, module damage repair, grounding fault repair

Function and working principle of Siemens servo power module.

The main function of Siemens servo power module is to generate DC bus voltage, supply to spindle module and feed servo module, and generate+24V and+5V voltages for internal use of the system and various modules. According to the DC voltage control method, it is divided into open-loop control UE module and closed-loop control I/R module. The UE module does not have a power feedback system, and its DC voltage is around 570V under normal conditions. However, when the braking energy is high, the voltage can reach more than 640 volts. The voltage of the I/R module is maintained at around 600V.

When AC 380V is sent to the power module, the internal logic power circuit first starts working, generating+24V and+5V voltages. When the internal power supply is normal, terminal 9 shows 24V voltage. At this point, the main contactor inside the module has not yet been engaged. Through its normally closed auxiliary contact, a 24V voltage appears on terminal 111. After the module completes the pre charging process, a 24V voltage appears on terminal 113, which is connected to terminal 63 through an external circuit, allowing the rectifier circuit of the ER module to operate and generate a 600V DC voltage.

2、 Siemens servo power module maintenance case.

1. An imported CNC lathe (Siemens 810D system) had an alarm "NC and PLC cannot be connected" on the screen after starting up. After opening the electrical cabinet, it was found that the indicator lights and digital tubes on the power module and NCU module were not displaying. The voltage at the input terminal of the power module was measured by a multimeter to be 395V. Therefore, it was determined that the fault was caused by a problem with the internal power circuit of the power module due to a high input voltage. After opening the module and checking the internal power supply part, it was found that a high-power field-effect transistor was burnt out. The damaged component was replaced, and the power grid voltage of the factory was adjusted to 380V before restarting. The system started normally.

2. An imported CNC spinning machine (Siemens 840D system), the hydraulic system does not start after startup. After analysis, it was found that the hydraulic starting circuit is connected in series with terminals 113 and 63 of the power module. Under normal conditions, a 24V voltage is generated on terminal 113 after startup. Through the hydraulic circuit, a 24V voltage will also appear on terminal 63 when the pulse is enabled, and the power module will start working normally. In the fault state, measuring the various terminals of the power module, it was found that 9 had 24V generated while 113 did not have 24V, indicating that the internal power circuit of the power module * had the problem with the main contactor. Opening the power module, checking the normally closed contact of the main contactor, it was found that its contact resistance was nearly 15k. After grinding the contact, the hydraulic system was restarted and the fault was eliminated.

1. Siemens frequency converters: 420, 430, 440, ECO, MDV, G11 series; 6SE70 engineering frequency converter;

2. Siemens CNC systems: 802S, 802C, 802D, 810T, 810M, 810D, 840D, 840C CNC systems;

3. Siemens Programmable Logic Controller (PLC): S5, S7 series;

4. Siemens human-machine interface (touch screen): OP, TP, MP series;

5. Siemens DC speed controllers: 6RA24, 6RA70, 6RA28 series;

6. Siemens servo drive, Siemens servo controller: MC 6SE70, SIMOTION series 6SL;

7. Siemens CNC drive module power supply: 6SN1145, 6SN1146, 6SN1123, 6SN1124, 6SN1118 maintenance series;

8. Siemens servo motors: 1FK6, 1FK7, 1FT6, 1PH7, 1PH4 series, ordinary motors 1LA, 1LG series;

9. Others: Siemens industrial computer maintenance, Siemens soft starter maintenance, Siemens UPS maintenance, Siemens power supply maintenance, Siemens motherboard maintenance, Siemens power board maintenance, etc;