Vacon NX Series Applications Manual
Also see for NX series: User manualUser manualApplications manualMaintenance manualOperating guide
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Contents
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Phases:1. The system and the motor controlled by the AC drive are started.2. The Auxiliary drive 1 starts when the main drive reaches the starting frequency set(P2.9.2).3. The main drive decreases speed down to Auxiliary drive 1 Stop frequency (P2.9.3) andstarts to rise toward the Start frequency of Auxiliary drive 2, if needed.4. The Auxiliary drive 2 starts when the main drive has reached the starting frequency set(P2.9.4).5. The Interlock feedback is removed from Aux. drive 2. Because the Aux. drive 3 is unused,it will be started to replace the removed Aux. drive 2.6. The main drive increases speed to maximum because no more auxiliary drives areavailable.7. The removed Aux.drive 2 is reconnected and placed last in the auxiliary drive start orderwhich now is 1-3-2. The main drive decreases speed to the set Stop frequency. Theauxiliary drive start order will be updated either immediately or in the next Stop(autochange, sleep, stop, etc.) according to P2.9.23.8. If still more power is needed, the main drive speed rises up to the maximum frequencyplacing 100% of the output power in the system's disposal.When the need of power decreases, the auxiliary drives turn off in the opposite order (2-3-1;after the update 3-2-1).9.13.2 PUMP AND FAN AUTOMATICS WITH INTERLOCKS AND AUTOCHANGEThe above is also applicable if the autochange function is used. In addition to the changedand updated start order, also the change order of main drives depends on parameter 2.9.23.VACON · 368 PARAMETER DESCRIPTIONS9 LOCAL CONTACTS: HTTP://DRIVES.DANFOSS.COM/DANFOSS-DRIVES/LOCAL-CONTACTS/ |
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