3 Functions and Systems Overview
3.1 System Overview
Illustration 2: Drive with Safety Option and Fieldbus Option
The safety option performs safety functions in accordance with EN IEC 61800-5-2. It monitors safe motion sequences on drives, which
are safely brought to a stop and shutdown if an error occurs.
The safety option:
• Activates safety functions.
• Monitors safe motion sequences.
• Signals the status of the safety functions to the safety control system via possible connected PROFIBUS fieldbus.
• Activates the selected failure reaction Safe Torque Off or Safe Stop 1 if an error occurs.
There are 2 variants of the safety option:
• With HTL encoder interface (MCB 151).
• With TTL encoder interface (MCB 150).
The safety option is constructed as a standard option for the VLT AutomationDrive FC 302 and is automatically detected after
mounting.
The safety option can be used to monitor the stopping, starting, or speed of a rotating or laterally moving device. As speed monitor,
the option is often used with hard guarding, access doors, and safety gates with solenoid-lock or -unlock safety switches. When the
speed of the monitored device drops below the set switch point (where its speed is no longer considered dangerous), the safety option
sets S37 output low. This allows the operator to open the safety gate. In speed monitor applications, the safety output S37 is high for
operation (when the motor speed of the monitored device is below the set switch point). When the speed exceeds the set value,
indicating a too high (dangerous) speed, the safety output is low.
The drive:
Functions and Systems Overview
Installation Guide | VLT® Safety Option MCB 150/151
AQ279747441421en-000101 / 130R0292 | 13
Danfoss A/S © 2018.09
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