Danfoss VLT FC Series Operating Instructions Manual

Also see for VLT FC Series: Service guide Installation instructions Installation guide Installation instructions Operating guide

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Danfoss VLT FC Series Operating Instructions Manual Manual pdf 54 page image

6.1.8 Bypass Status Word Bit Examples1. Motor running and bypass in drive mode. Status word 22 hexadecimal converts to 00000100010 binary.Bit 10 9 8 7 6 5 4 3 2 1 0Binary 0 0 0 0 0 1 0 0 0 1 0Table 6.102. External interlock fault (open) and bypass in bypass mode. Status word 208 hexadecimal converts to 01000001000binary.Bit 10 9 8 7 6 5 4 3 2 1 0Binary 0 1 0 0 0 0 0 1 0 0 0Table 6.116.1.9 ECB Auto BypassGeneral informationAuto bypass allows a fault condition in the drive toactivate running the motor in bypass without operatorintervention. Activation of the function is through settingtimer start parameters in the drive programming. Fault tripand running in bypass are reported through the drivedisplay, digital outputs, and serial communications. Inaddition, the independently powered ECB card is availableto report bypass status when the drive is inoperable(control card operative) through its serial communicationsor digital outputs.Before enabling auto bypass• Complete the start-up procedure to verify motorrotation direction in bypass is correct and thatthe system is ready in all respects for continuousfull speed operation in bypass.Operation• With the auto bypass function enabled, a faultsignal from the drive activates the auto bypasstimer.• If the fault clears before the time delay iscomplete, the motor remains operating in drivemode. This allows temporary faults, such as amomentary under or over voltage, to clearwithout transferring the system to bypass.• If the timer completes its cycle before the faultclears, the panel trips into bypass mode and themotor runs at constant full speed from line inputvoltage.• In bypass, the motor will stop:- if the drive receives a remote stopcommand- local stop ([Off]) on the LCP is pressed- a remote start command is removed- a safety is open- motor overload is tripped• Once auto bypass is activated, the only way toreset the unit back to drive mode is by operatorintervention. Ensure that the fault has beencleared, then press [Bypass] on the LCP and selectdrive mode.Auto bypass function setupEnable auto bypass by changing parameters in parametergroup 31-** Bypass Option in the drive extended menu.• 31-01 Bypass Start Time Delay. Setting the timer atanything other than 0 time activates start delayin bypass. Leave at 30 s default or set as desiredup to 60 s.• 31-02 Bypass Trip Time Delay. Setting the timer atanything other than 0 time activates auto bypass.Leave at 5 s default or set as desired up to 60 s.130BX243.10Illustration 6.14 Bypass Trip Time DelayElectronically Controlled B... Option Panel Operating Instructions52 MG14I102 - VLT® is a registered Danfoss trademark66