Danfoss VLT MCB 150 Operating Instructions Manual
Also see for VLT Safety Option MCB 150: Installation guideInstallation guide
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3.5.3 Safe Torque Off - STOThe safety function Safe Torque Off disconnects power tothe motor. It is implemented via the frequency converter'sshutdown path and the safety option’s safe outputs.Features of the safety function• The motor becomes torque-free and no longergenerates any hazardous movements• To prevent the frequency converter from runningdown in an uncontrolled manner. In normaloperation, activate the safety function SafeTorque Off via the safety function Safe Stop 1• Safe Torque Off is only activated directly when- There is an internal error on the safetyoption- The Safe Stop 1 delay time is set to 0- One of the inputs DI1 or DI2 has beenselected as Safe Torque Off function• The safety function Safe Torque Off correspondsto a category 0 stop (uncontrolled stop) inaccordance with EN IEC 60204-1.Prerequisites for normal operation• Input DI1 or DI2: "1" Signal (+24 V DC)• S37 output: "1" Signal (+24 V DC).Safety function is activated• By an error after limit values have been exceededfor Safe Stop 1 and Safely Limited Speed• By an internal error on the safety option orfrequency converter, if the frequency convertercan no longer be controlled• By executing the safety function Safe Stop 1 (1/0transition). In this case the frequency converter ismonitored before it is switched to torque-free.• By download of parameterisation via MCT 10 SafePlug-in if the current frequency converter isrunning.• By executing the safety function Safe Torque Off(1/0 transition). This function ensures that notorque-generating energy can continue to affect amotor and prevents unintentional start-ups.WARNINGIf any external forces influence the motor axis (e.g.suspended loads), additional measures (e.g. a safetyholding brake) are required to eliminate hazards.The Safe Torque Off (STO) may be used where powerremoval is required to prevent an unintended start. Thefunction disables the control voltage of the frequencyconverter output stage. Thus, it prevents the frequencyconverter from generating the voltage required to rotatethe motor (see Illustration 3.6). The function allows forperforming maintenance work on non-electrical parts ofthe machinery without switching off the power supply tothe frequency converter.frequency130BC318.10time1 2AA Actual frequency1 Activation of Safe Torque Off2 Motor standstillIllustration 3.6 Safe Torque Off3.5.4 Safe Stop 1 - SS1The safety function Safe Stop 1 monitors the decelerationto zero speed in a controlled manner and activates SafeTorque Off after detection of stop. The Safe Stop 1 caneither be configured as SS1 Delay or SS1 Ramp.Features of the safety function• The safety function Safe Stop 1 corresponds to acategory 1 stop (controlled braking) inaccordance with EN IEC 60204-1• Monitoring the speed deceleration after whichthe energy supply to the motor is safelyinterrupted• The motor becomes torque-free and removeshazardous movements3.5.4.1 SS1 DelaySelect SS1 Delay to activate Safe Stop 1 function while aparameterised safety delay timer expires.Functions and System Overvi... Operating InstructionsMG34W302 Danfoss A/S © Rev. 2014-02-11 All rights reserved. 153 3 |
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