Functional Safety Concept; Functional Description; Safety Precautions - Danfoss VLT MSD 510 Operating Manual

Operating Guide | VLT® Multiaxis Servo Drive MSD 510 System

8 Functional Safety Concept

8.1 Functional Description

The VLT® Multiaxis Servo Drive MSD 510 system integrates the safety function Safe Torque Off (STO). The safety function is available in
daisy-chain format, which is possible between all system components except for ACM 510 (cables are not included). The hybrid cable
passes the STO signal from the DAM 510 to all ISD 510/DSD 510 servo drives in the chain. Once STO is activated (safe state), no torque
is generated on the ISD 510/DSD 510 servo drives, or on any motors connected to SDM 511/SDM 512. Reset of the safety function and
diagnostics can be carried out via the PLC.
Use the STO function when performing mechanical work on the servo system or affected area of a machine to avoid a
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mechanical hazard. However, the STO function does not provide electrical safety.

8.2 Safety Precautions

UNCONTROLLED MOVEMENT
External forces on the motor could cause an uncontrolled and hazardous movement that could result in death or serious injury.
Equip the motor with additional measures for preventing uncontrolled and hazardous movement, for example mechanical
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brakes.
RISK OF ELECTRICAL SHOCK
The STO function does not isolate mains voltage to the servo system or auxiliary circuits. Failure to isolate the mains voltage
supply and wait for the specified discharge time to elapse could result in death or serious injury.
Only perform work on electrical parts of the Danfoss system components or the ISD 510/DSD 510 servo drives after
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isolating the mains voltage supply and waiting for the discharge time to elapse.
RISK OF RESIDUAL ROTATION
Due to failures in the power semiconductor of the drive, a residual rotation can result from a fault that could result in death or
serious injury. The rotation can be calculated to angle = 360°/(number of poles).
Take this residual rotation into consideration and ensure that it does not pose a safety risk.
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LED STATUS RELIABILITY
Status indicators (LEDs) are not reliable for safety functions.
Only use status indicators for general diagnostics during commissioning and troubleshooting.
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Functional Safety Concept
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