Basic Working Techniques; Variable Speed Drives/Frequency Converters - Husqvarna PG 680 Operator's Manual

Basic working techniques

General
The Husqvarna PG 680/820 floor surfacing machines are
designed for wet or dry grinding of marble, terrazzo,
granite and concrete. Their applications range from rough
grinding through to a polished finish.
It is highly recommended to use the Husqvarna DC 6000
dust extraction system for complete dust control.
Variable speed drives/frequency
converters
WARNING! The Speed drive/Frequency
!
converter may only be used by
authorized personnel. Risk of electric
shock!
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:
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.
20 – English
OPERATING
Keypad/Display
Each variable speed drive or frequency converter has a
keypad which will appear as illustrated below when the
machine has power connected to it.
2
3
4
5
6
1 Run direction (fwd or rev)
2 Indicates if unit is either stopped or running
3 Up key
4 Reset button
5 Left key
6 Select button
7 Down key
8 Enter button
9 Right key
10 Stopping
11 Starting
12 Output mode (Hertz in this example)
13 Output value
14 Stand by ready indicator
14
1
READY
STOP
I/O term
Hz
ready run
fault
START
reset
STOP
select
enter
7
13
12
11
10
9
8