IndustrialDriveDataDrive Board & Diagnostic Database
Diagnostic workflow

Siemens 6SE70 Brake Control Diagnostic Workflow

Entry symptom: Brake does not release/close correctly, load slips, or the drive trips during brake sequence on a MASTERDRIVES application.

Machine-control workflow8 min read

Scope of this technical record

Step-by-step route for MASTERDRIVES brake release/close issues, load slip and brake-sequence trips.

Safety boundary

Vertical or suspended loads must be mechanically secured. Do not test brake release by trial command on an unsecured machine.

6SE70 brake diagnostic workflow route

1Load secured
→
2Parameters
→
3Output
→
4Coil
→
5Mechanical proof

The workflow prevents unsafe trial release and parameter edits without a baseline.

6SE70 brake workflow image

6SE70 brake diagnostic workflow load secured parameters output coil mechanical proof
The workflow image avoids unsafe trial release on an unsecured load.

Workflow sequence

The workflow begins with mechanical safety and parameter capture. Only then should the technician verify drive output, coil supply and mechanical brake response. A drive relay can be healthy while the brake remains mechanically stuck, and a brake can be healthy while the coil supply is missing.

If the electrical and mechanical paths are credible but the sequence remains wrong, the case moves to interface/terminal evidence and parameter timing review.

Brake diagnostic workflow

StepEvidenceStop condition
1Load secured and brake arrangement knownUnsafe motion risk
2Current parameter values recordedNo baseline
3Output/relay command checkedNo command or wrong state
4Coil supply verifiedVoltage missing or overheating
5Mechanical brake inspectedWorn/sticking brake
6Controlled sequence testUnstable load or unresolved evidence

Field record checklist

  • Load secured
  • Brake type
  • Timing parameters
  • Output command
  • Coil voltage
  • Mechanical brake condition
  • Interlock/feedback status

Technical basis and reference documents

This is an independent editorial technical reference. Original manufacturer documentation remains controlling for installation, repair and commissioning decisions.

SIMOVERT MASTERDRIVES Vector Control Operating InstructionsSiemens Industry Support

OEM basis for 6SE70 / 6SE71 safety, control connections, motor temperature evaluation and option context.

SIMOVERT MASTERDRIVES brake and thermal protection evidence notesIndustrialDriveData editorial extraction

Internal technician note set used only to structure public diagnostic routes around KTY/PTC thermal protection and brake-control evidence.

Linked records

BRAKE CONTROL
Holding Brake Release / Close Timing Problem

The MASTERDRIVES brake-control function depends on release/close delay times, thresholds, output wiring and mechanical brake condition. It must be treated as a functional safety-adjacent motion issue, not a simple relay output problem.

Open →Circuit
Siemens 6SE70 Brake Control Path

Maps drive brake-control logic to relay output, brake coil supply, release/close delays and mechanical brake condition for hoist and vertical-axis applications.

Open →
Evidence intake

Turn this record into a qualified service request

A repair decision is much more reliable when the request includes the exact identity of the drive, the first fault evidence and the machine condition when the symptom appeared.

  • Complete drive type code / MLFB or nameplate model
  • Fault code, fault value and first event before reset
  • When the event appears: power-up, enable, ramp, run, decel or stop
  • Motor/cable connected or isolated during the symptom
  • Visible board, option-card, module and connector identifiers
  • Previous repair history, replacement parts and repeat-failure pattern
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