The submitted Yaskawa SGDB-15VD produced Alarm A10 immediately whenever a motor rotation was commanded.This alarm typically appears when the drive initializes successfully but does not receive stable feedback from the encoder or detects a phase mismat...
Repair of an Okuma Servo Drive MIV0204-1-B1
The Okuma Servo Drive MIV0204-1-B1, order number 1006-2231, was tested in a CNC machine. When powered on, the CNC control displayed Alarm 1151-03 “Alarm A”, while the inverter showed alternating messa...
Error Description Alarm 32 “Overcurrent”.
According to the Mitsubishi service manual (page I-37), Alarm 32 means:
Overcurrent A current exceeding the allowable value has flowed into the DC bus inside the unit.
Typical causes:
Defe...
Initial Condition and Diagnosis.
The Yaskawa CACR-SR05SB1AFY187 arrived with Alarm 1 Overcurrent immediately after power-up.According to Yaskawa’s diagnostic table, this alarm indicates that an overcurrent was detected in the main circuit, typica...
Initial Condition and Analysis
The Mitsubishi MDS-B-SP-75 Spindle Drive Unit arrived with the display showing alarm “n” or “1”, indicating an internal power module error. These error codes typically occur when an asymmetrical load or a shor...
Fault Description and Diagnosis
At the customer’s facility, the converter suddenly stopped working and displayed Fault “01”, corresponding to Overcurrent, as described in Yaskawa’s documentation. In practice, this alarm can have various roo...
Description and Initial Situation
A Mitsubishi MDS-DH2-V2-2020 Servo Drive Unit arrived at our workshop after the device suddenly failed to power up on a Monday morning at the customer’s facility. The machine stopped completely, and the drive’s...
No English translation available...
The insulation resistance measured by the customer was only about 100 kΩ instead of the required multi-megohm range
Diagnosis and Fault Cause
Our initial inspection confirmed poor insulation. The motor interior was soaked with coolant due to w...
Repair description.
The received unit exhibited two main issues: startup problems in cold condition and unstable speed regulation above approximately 2200 rpm. This kind of fault pattern is typical for aged components within the voltage and current...