Variable speed drives/frequency converters
Variable speed drives/ frequency converters
Each Husqvarna PG 680 & 820 is equipped with 2 variable speed drive or frequency converter. This unit is incorporated into the machine for the following reasons:
1. Functional
•Manipulate incoming power to enable increase/ decrease in speed & direction change.
•Regulate current and voltage supply to the motors to ensure motors run at optimum levels (e.g. torque boost).
2.Protection/Diagnostic Protection
•Monitors incoming power to ensure suitability for machine and application being performed.
•Controls current being drawn by motors to ensure motors are running within safe operational limits (to prevent damage to motor).
•Monitors load on machine to ensure the grinder is
not being overloaded thus offering protection for belt, bearings and other internal components.
•Protects motors from faulty power supply (e.g. run- ning on 2 phases).
Diagnostic
•Identifies electrical faults with the machine and registers fault code.
•Has monitoring menus that help isolate cause of potential electrical faults.
•Monitoring menus also enable operator to gauge how hard machine is working. Whilst it is not essen- tial for an operator to intimately know every feature of the variable speed drives or frequency convert- ers, it is useful to be familiar with both the fault codes as well as some of the monitoring menus.
Keypad/Display
Each variable speed drive or frequency converter has a keypad which will appear as illustrated on the right when the machine has power connected to it.
1.8.
2.
7.
4. 3. 5. 6.
Keypad display
1.Run direction (fwd or rev)
2.Indicates if unit is either stopped or running
3.Up key
4.Left key
5.Down key
6.Reset button
7.Output mode (Hertz in this example)
8.Output value
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