Variable Speed Drives/Frequency Converters - Husqvarna PG820 RC Operator's Manual

Speed and direction of rotation for different uses
Speed and direction setting is often a matter of personal choice. Operators are encouraged to experiment to find which
settings best suit the given applications. The following table lists some suggested set-ups for different applications.
Applications
Ceramic tile adhesive removal
Carpet glue removal
Epoxy paint removal
Rain damaged concrete
Smoothen exposed aggregate
Lippage removal in terrazzo/
stone tiles
Concrete polishing with plastic
bonded tools
PIRANHA™ scraper tool
Re-grouting procedure during
HiPERFLOOR™ process
NOTICE! In the above table, FWD & FWD are listed together to indicate direction settings in the same direction (i.e. It
can also be REV/REV). The only application where direction settings must be in the same directions and also direction
specific is when using the PIRANHA™ scraper tools. In this particular application the setting must be in the REV/REV
direction.

Variable speed drives/frequency converters

Each Husqvarna PG820 RC is equipped with 2 variable speed drive or frequency converter. This unit is incorporated
into the machine for the following reasons:
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).
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. running 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 essential for an operator
to intimately know every feature of the variable speed drives or frequency converters, it is useful to be familiar with both
the fault codes as well as some of the monitoring menus.
30 – English
OPERATING
Direction control Speed control for
for planetary head planetary head
rotation
FWD
FWD
FWD
FWD
FWD
FWD
FWD
REW
FWD
Direction of rotation
of grinding discs
rotation
6-7
5-7
5-10
7-10
7-8
5-7
10
3-5
8-10
Speed setting for
grinding discs
FWD 8-10
FWD 8-10
FWD 8-10
FWD 8-10
FWD 8-10
FWD 8-10
FWD 8-10
REW 3-5
FWD 3-5