Brand: SIEMENS
Category: Control Unit
Document Type: Manual
Language: EN
Manual for 8DJH
Uploaded: Nov. 21, 2025, 7:41 p.m.
Manual Publish Date: 2017-08-21
Warranty Information
The warranty contained in the contract between the parties is the sole warranty of Siemens.
Operation
This manual details the operation of the Siemens 8DJH medium-voltage switchgear. It covers various aspects including:
- Switching operations: Instructions for operating the three-position switch-disconnector and the circuit-breaker.
- Indicators and control elements: Explanation of various indicators and how to use control elements.
- Safety procedures: Emphasis on safety measures during operation, including isolation and verification of safe isolation.
- Testing: Guidance on cable testing and cable sheath testing.
- Fault handling: Procedures for identifying and clearing faults, including understanding LED status indicators and fault coding.
Specific operations include charging the spring energy store, closing/opening circuit-breakers and switch-disconnectors, and handling fault signals from the MCU (Motor Control Unit).
Troubleshooting and error codes
| Type of failure | Indication via LED status indicator | Interlocking to the circuit-breaker1) | Cause | Measure |
|---|---|---|---|---|
| Incorrect sense of rotation of motor | Permanently red | Off | Motor polarity interchanged | Check motor connecting leads at the motor. Then, perform reset of MCU |
| Relay on MCU clocks on command input (approx. 1x per sec.) | none | Off | No load voltage available | Check load voltage supply |
| Relay on MCU clocks very quickly on command input (approx. 5x per sec.) | none | Off | No control voltage available | Check control voltage supply |
| H-bridge is not isolated from supply | 2x red | On | N2) not earthed (IT system) | Earth N. Then, perform reset of MCU |
| No feedback of disconnector contact after disconnector CLOSED command | 3x red | On | Disconnector could not be CLOSED within the maximum permissible runtime. Mechanical defect or defect at the gear motor | Check operating mechanism and gear motor. Then, switch the operating mechanism manually to an end position and perform reset |
| No feedback of opening contact after disconnector OPEN command | 4x red | On | Disconnector could not be OPENED within the maximum permissible runtime. Mechanical defect or defect at the gear motor | Check operating mechanism and gear motor. Then, switch the operating mechanism manually to an end position and perform reset |
| No feedback of earthing switch contact after earthing switch CLOSED command | 5x red | On | Earthing switch could not be CLOSED within the maximum permissible runtime. Mechanical defect or defect at the gear motor | Check operating mechanism and gear motor. Then, switch the operating mechanism manually to an end position and perform reset |
| No feedback of opening contact after earthing switch OPEN command | 6x red | On | Earthing switch could not be OPENED within the maximum permissible runtime. Mechanical defect or defect at the gear motor | Check operating mechanism and gear motor. Then, switch the operating mechanism manually to an end position and perform reset |
| No standby mode after end of command | 8x red | On | Circuit for automatic shutdown of MCU defective | Replace MCU |
| Impermissibly long switching command | 8x red | On | Switching command is applied for more than 5 min | Shorten command output. Then, perform reset of MCU |