Vacon 100 hvac Applications Manual

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Vacon 100 hvac Applications Manual Manual pdf 165 page image

P3.14.4 AUTOCHANGE (ID 1027)Selectionnumber Selection name Description0 DisabledIn normal operation, the sequence of the motors is always 1,2, 3, 4, 5. The sequence can change during the operation ifyou add or remove interlocks. After the drive stops, thesequence always changes back.1 EnabledThe system changes the sequence at intervals to wear themotors equally. You can adjust the intervals of the autoch-ange.To adjust the intervals of the autochange, use P3.14.5 Autochange Interval. You can set themaximum number of motors that can operate with parameter Autochange: Motor Limit(P3.14.7). You can also set the maximum frequency of the regulating motor (Autochange:Frequency Limit P3.14.6).When the process is in the limits that are set with parameters P3.14.6 and P3.14.7, theautochange occurs. If process is not in these limits, the system will wait until the process isin the limits, and do the autochange after that. This prevents sudden pressure drops duringthe autochange when a high capacity at a pump station is necessary.EXAMPLEAfter an autochange, the first motor is put last. The other motors move up 1 position.The start sequence of the motors: 1, 2, 3, 4, 5--> Autochange -->The start sequence of the motors: 2, 3, 4, 5, 1--> Autochange -->The start sequence of the motors: 3, 4, 5, 1, 29.13 FIRE MODEWhen Fire mode is active, the drive resets all faults that occur and continues to operate atthe same speed until it is not possible. The drive ignores all commands from the keypad,fieldbuses, and the PC tool.The Fire mode function has 2 modes, the Test mode and the Enabled mode. To make aselection of a mode, write a password in parameter P3.16.1 (Fire Mode Password). In theTest mode, the drive does not automatically reset the faults, and the drive stops when a faultoccurs.NOTE!This input is normally closed.When you activate the Fire mode function, an alarm shows on the display.PARAMETER DESCRIPTIONS VACON · 16524-HOUR SUPPORT +358 (0)201 212 575 · EMAIL: VACON@VACON.COM 9