Danfoss VLT MCB 150 Operating Instructions Manual
Also see for VLT Safety Option MCB 150: Installation guideInstallation guide
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3. Configure the S-Ramp ratio at deceleration startin 42-48 S-ramp Ratio at Decel. Start and set42-49 S-ramp Ratio at Decel. End for S-Ramp ratioat deacceleration end.Parameter Unit Range Default42-42 Delay Time s 0.1-3600.0 s 1.0 s42-43 Delta T % 0-50% 5%42-48 S-ramp Ratio at Decel. Start % 1-99 5042-49 S-ramp Ratio at Decel. End % 1-99 50Table 3.1 Parameters for SS1 Delay with S-ramp Stop Profile130BC322.111 2timefrequency34actualfrequency56A Actual frequency1 Activation of SS1 Ramp Delay2 Activation of Safe Torque Off3 42-42 Delay Time4 42-43 Delta T5 42-48 S-ramp Ratio at Decel. Start6 42-49 S-ramp Ratio at Decel. EndIllustration 3.8 SS1 Delay with S-ramp Stop Profile3.5.4.3 SS1 RampNOTICEThe SS1 Ramp function can only be used when anencoder is connected to the safety option.This Safe Stop type allows access to the hazard areaimmediately after motion is detected as stopped ratherthan waiting until a specific time has elapsed.The safety option monitors the following functions• Braking ramp- In the MCT 10 Set-up Software SafePlug-in, the braking ramp is specifiedand monitoring is activated. The brakingperiod depends on the speed of themotor when braking is started. Thebraking ramp can be monitored via amaximum speed error specified in theMCT 10 Set-up Software tolerable in42-45 Delta V.• Braking ramp in normal operation- The frequency converter starts with theconfigured braking ramp when safetyfunction Safe Stop 1 has been activated.Once the speed is at zero speed limit,Safe Torque Off is activated.• Safety function Safe Torque Off is activated whenthe configured limit value for the position error isexceededA standstill threshold Zero speed (42-46 Zero Speed) foractivating the safety function Safe Torque Off can bespecified in MCT 10 Set-up Software.Safety function Safe Torque Off is activated when zerospeed is achieved.Prerequisites for normal operation• Input DI1 or DI2: "1" Signal (+24 V DC)• S37 output: "1" Signal (+24 V DC). The safetyoption is ready for operationA 1/0 transition at the selected DI1 or DI2 input activatesthe safety function.Signal status of the inputs DI1 and DI2The Safe Stop 1 ramp starts when one of the 2 inputs isset to “0”. The safety function Safe Torque Off is activatedonce the braking ramp has reached zero speed.3.5.4.4 SS1 Ramp SlopeFor the stopping process, the safety option initiates a stopsignal to the frequency converter and monitors thecontrolled braking by monitoring the braking ramp. Theadmissible deceleration ramp is specified in42-44 Deceleration Rate. The frequency converter mustdecelerate at least with the steepness of this decelerationramp in the event of a Safe Stop 1 request from the safetyoption, even under heavy load. If the frequency converterdoes not fulfill the admissible deceleration ramp during aSafe Stop 1 requested by the safety option, a Safe TorqueOff is triggered immediately. The motor then performs anuncontrolled stop. This action prevents the frequencyconverter from continuing to run or even accelerating inthe event of an error.Functions and System Overvi... Operating InstructionsMG34W302 Danfoss A/S © Rev. 2014-02-11 All rights reserved. 173 3 |
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