Danfoss VLT MCB 150 Operating Instructions Manual
Also see for VLT Safety Option MCB 150: Installation guideInstallation guide
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NOTICEThe discrepancy time does not extend the safety optionresponse time. The safety option activates its safetyfunction as soon as one of the 2 DI signals changes fromhigh to low.3.6.7 Stable Signal Time from Safe OutputsThe safety option normally responds immediately to signalchanges at its safe input DI1 or DI2. This response is notrequired in the following cases• When interconnecting the safe input of theoption with an electromechanical sensor, contactbounce may result in signal changes occurring, towhich the option could respond.• Several control modules test their safe outputsusing test pulse pattern (on/off tests), to identifyfaults due to either short or cross circuiting.When interconnecting the safe input of theoption with a safe output of a control module,the option could respond to these test signals.A signal change during a test pulse pattern usually lasts 1ms.Under stable signal time, short pulses, which could lead tosafety functions being incorrectly activated, can be filtered.NOTICEThe stable signal time extends the safety optionresponse time. The safety option only activates thesafety function after the response time has expired.If the signal to the input on safety option is not stable, theoption responds with a fault.Definition of a stable signalFollowing a change to the DI input signals, the optiontriggers an internal monitoring time. Use 42-23 StableSignal Time to select an appropriate stable signal time. Aconstant signal level is a high or a low state, for at least42-23 Stable Signal Time.Input Signal130BC317.10DI1/DI2Safety functionActiveInactiveTest pulse patternStable signal time Stable signal timeIllustration 3.15 Filter for Suppressing Temporary SignalChanges3.6.8 Zero Speed Time Error DetectionZero Speed Timer monitors if the frequency converter isoperated below 120 RPM during Safely Limited Speed.42-18 Zero Speed Timer contains the remaining time untilthe monitoring responds. The safety option signals AlarmExt Fail Prec Thresh Timer Elapsed after the monitoring timeexpires.Define the monitoring time while commissioning thesystem depending on the particular application.3.6.9 Yearly TestAccording to EN ISO 13849-1, EN IEC 62061 and EN IEC61508, the safety option must regularly test its safety-relevant circuits to ensure correct functioning. This testmust be performed at least once every year. After thepower supply has been connected, the safety optionchecks its circuits to switch-off the torque each time theSafe Torque Off function is selected. The safety optionmonitors the regular test interval of its safety-relevantcircuits using a time module.After one year in operation, the frequency converterdisplays a message that a yearly test must be performed.The frequency converter must be power cycled by discon-necting and then reconnecting the supply voltage. Activatethe used inputs on the safety option and check that theyfunction correctly.3.6.10 Safety Parameter SettingsFactory setting for both digital inputs is Safe Torque Off,meaning that the Safe Output S37 is in low state.Functions and System Overvi... Operating InstructionsMG34W302 Danfoss A/S © Rev. 2014-02-11 All rights reserved. 233 3 |
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