Rarely. A shorted motor winding could cause the drive to inhibit pulse enable, but typically you would also see an overcurrent or earth fault alarm.
In the world of industrial automation, few things bring a production line to a screeching halt like an unexpected drive fault. Among the legacy titans of CNC and servo drive technology, the Siemens SIMODRIVE 611 series remains a workhorse in countless machine tools, from milling machines to injection molders. But when the green lights turn red and the operator panel flashes a cryptic "607," even seasoned technicians can feel a chill.
Error 607 is not just a random number. It is a specific, high-priority alarm that points directly to a critical failure in the drive’s power management system. Understanding this fault is the first step toward minimizing downtime and preventing cascading hardware damage.
To properly troubleshoot, you must understand energy flow. In a motor-drive system:
In a properly functioning system, a braking resistor or regenerative power supply dissipates or returns this excess energy to the grid. Error 607 signifies that the braking system or power supply failed to handle this regenerative energy, causing the DC link voltage to spike.
Siemens SIMODRIVE 611 Error 607 is a classic “can’t start” fault that intimidates many due to its safety interlock nature. Yet, with a methodical approach starting at the 48V power supply and following the signal chain, it is one of the most solvable errors in the Siemens drive family.
Always keep a spare 48V supply unit and a set of ribbon cables in your spare parts cabinet. Document your enable signal wiring. And when in doubt, let SimoCom U speak – the internal diagnostic data is remarkably accurate.
If you have solved an unusual case of Error 607, share your experience – the industrial automation community benefits greatly from real-world fault-finding records.
Need additional help?
Author’s note: Always follow lock-out/tag-out procedures when working on live drives. The DC link can retain lethal voltage for up to 10 minutes after power-off.
Error 607 on a Siemens Simodrive 611 typically signifies a "Current controller output limited" or a "Contouring error". This means the motor is drawing its maximum current but is unable to reach the set position or speed commanded by the control module. Common Causes
Missing Phases or Power Issues: A phase might be missing in the motor supply, or the motor contactor is not engaging.
Cabling and Connectors: Damage to the motor supply cable, loose connectors, or poor contact between the inverter and motor.
Hardware Faults: A defective control module (LT-module) or power section.
DC Link Issues: Problems with the DC link busbar, such as loose connections or insufficient voltage.
Mechanical Resistance: Excessive mechanical load or axis binding that prevents the motor from moving as expected. Recommended Remedies
Check Electrical Connections: Inspect the motor supply cable (the orange cable) and its plugs for damage or loose pins.
Verify DC Link: Check the DC link bus voltage and ensure the busbars are tight and properly connected.
Test the Motor: Measure the impedance of the servo motor directly and through the cable to identify internal shorts or open phases.
Exchange Components: If multiple axes are available, try swapping the control module or the power section with a known working unit to isolate the fault.
Monitor Watchdog/Communication: In some configurations, this code can relate to a watchdog timer expiry on the control module, which often requires replacing the module.
For more technical specifics, you can refer to the official Siemens SiePortal support forums or the SIMODRIVE 611 universal Function Manual. Simodrive 611: error 607 etc. - Siemens SiePortal
In the Siemens Simodrive 611 (often displayed as or CNC alarm ) signifies that current controller output is limited
. This occurs when the drive attempts to reach a setpoint by outputting maximum voltage, but the measured motor current remains below the expected value. Root Causes The most common reasons for this fault include: Physical Disconnection
: The motor power cable is unplugged, loose, or has a broken phase. Internal Hardware Faults
: A failure within the drive's power section (IGBT module) or the control module itself. DC Link Issues
: Missing or insufficient DC link voltage (typically should be ~600V), or loose busbar screws. Mechanical Blockage
: The axis is mechanically stuck, or a motor brake is failing to release, forcing the drive to its current limit. Troubleshooting & Remedies If you encounter this error, follow these diagnostic steps:
Error 6 on Simodrive after changed motor bearings - SiePortal - Siemens
The Error
It was a typical Monday morning at the manufacturing plant, with the sound of humming machinery and the smell of freshly brewed coffee wafting through the air. But for technician Jack, it was about to become a frustrating day. He received a call from the production team that one of their critical machines, a CNC machining center, had stopped working overnight. The machine's control system, a SimoDrive 611, displayed an error code 607: "Encoder test failed".
The Investigation
Jack arrived at the machine and began to investigate. He checked the basics: power supply, connections, and communication cables. Everything seemed fine. He then accessed the SimoDrive 611's diagnostic menu and ran a quick test. The results confirmed the error code 607. Jack knew that this error typically indicated a problem with the encoder feedback system, which measures the motor's position and speed.
The Possible Causes
Jack reviewed the machine's documentation and the SimoDrive 611 manual. According to the manual, error 607 could be caused by:
He decided to start by checking the encoder cable and connectors. A quick visual inspection revealed that the cables were securely connected, but Jack noticed that one of the connectors seemed loose. He tightened it and ran the diagnostic test again. The error persisted.
The Solution
Next, Jack decided to check the encoder settings. He accessed the SimoDrive 611's parameter list and verified that the encoder settings matched the motor's specifications. After confirming that the settings were correct, Jack suspected that the problem might be with the encoder or resolver itself.
He called in a colleague, an experienced motor specialist, to help him test the motor and encoder. Together, they performed a series of electrical tests on the motor and encoder. The tests revealed that the resolver, which is a type of encoder used in the SimoDrive 611 system, was faulty.
The Repair
With the diagnosis confirmed, Jack and his colleague replaced the resolver. They then reconfigured the SimoDrive 611's encoder settings to match the new resolver. After completing the repair, Jack ran the diagnostic test again. This time, the test passed, and the error code 607 disappeared.
The Lesson Learned
The production team was relieved to have their machine back online, and Jack was satisfied with having solved the problem efficiently. He documented the repair and added a note to the machine's maintenance record, recommending regular checks on the encoder and resolver to prevent similar issues in the future. Jack also made a mental note to stay up-to-date with the latest SimoDrive 611 troubleshooting techniques and best practices to ensure he was prepared for any future challenges.
From that day on, Jack was known as the "SimoDrive 611 whisperer" among his colleagues, and his expertise was sought after for any issues related to the system.
The Simodrive 611 error code 607 (often appearing as A607, E-A607, or 300607 on a connected SINUMERIK CNC screen) directly relates to the drive's current control mechanism.
The technical definition for this fault is: Current Controller Output Limited. 🔍 Understanding Error 607
The fault is triggered when the drive's internal current regulator attempts to force a commanded current through the motor, but the current cannot be achieved despite the drive supplying the maximum available voltage.
Essentially, the system is yelling, "I am pushing as much power as I can, but no current is flowing back!" Because this represents a loss of control or a severe break in the circuit, the drive initiates a safe shutdown to protect its hardware and the connected machinery. 🛠️ Common Causes
The causes for this fault range from simple physical disconnections to internal component failures within the control or power hardware:
Missing Phase or Disconnected Motor: A broken wire in the motor power cable, a loose connection at a terminal block, or a plug that has rattled loose.
Open Circuit in Motor Windings: The motor may have a burnt-out or broken phase winding.
DC Link Bus Issues: Missing or heavily fluctuating DC link voltage, or loose screws on the physical copper busbars that tie the modules together.
Hardware Failure in the Power Section (LT-Module): Blown IGBT (Insulated-Gate Bipolar Transistor) power transistors or failing firing circuits.
Faulty Control Module: The closed-loop control card inserted into the module may have corrupted parameters or failing internal logic. 🩺 Step-by-Step Diagnostic & Remedy Guide
⚠️ DANGER: Before touching anything related to the Simodrive 611, shut down the main power and wait at least 30 minutes! The DC link capacitors can hold lethal voltages (over 600V DC) long after the machine has been turned off. Always verify that the DC bus is at 0V with a properly rated multimeter before starting work. 1. Inspect the Motor and Cables
Visual Check: Look closely at the orange or black heavy-duty motor power cable. Check for nicks, tears, or extreme bends, particularly where it enters the cable track.
Connection Integrity: Ensure that the power plugs on both the drive side and the motor terminal box are fully seated and free of coolant or oil contamination.
Winding Resistance: Disconnect the motor power cable at the drive. Use an ohmmeter to measure the resistance across the motor phases (
). They should be balanced and read low ohms. An infinite reading (OL) points to a severed cable or an open motor winding. 2. Verify the DC Link Bus
Busbar Screws: Check the physical copper bars linking the modules. If a screw has vibrated loose, the physical connection will fail under high current demands, dropping the voltage.
Bus Voltage: While the machine is powered on (and taking extreme safety precautions), check that the DC link is maintaining its nominal voltage. Depending on your infeed module (unregulated vs. regulated), this is usually around 3. Rule Out Software or Parameter Glitches
Sometimes intense electronic noise or minor firmware handoff issues cause a false trip. Perform a hard reset by cycling the machine breaker completely off, letting the drive screen go dark, and powering it back up. 4. Swap and Isolate Hardware
The Control Card: If you are running a multi-axis system and have an identical axis on the same machine, attempt to swap the control card (plug-in module) to see if the 607 error migrates to the other axis. If the error moves, your control card is likely defective.
The LT-Module (Power Section): If the error stays on the same physical axis despite a new cable, motor, and control card, the internal firing circuits or the IGBT brick inside the power module have failed and require professional repair or replacement.
💡 Pro-Tip: If the fault occurs randomly or only during aggressive acceleration/deceleration, inspect your encoder cables and the motor's ground connection as well. Intermittent feedback tracking can cause the current controller to briefly spike and trip. Simodrive 611: error 607 etc. - Siemens SiePortal
Follow the steps below sequentially to isolate the fault.