Power Supply - Optimum OPTigrind GZ 20C Betriebsanleitung

We do not take any liability for damages caused by incorrectly performed commissioning.
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Qualification of personnel on page 25
3.6.1

Power supply

WARNING!
Check the correct direction of rotation of the grinding wheel by briefly turn on the
machine. The correct direction of rotation is marked with a directional arrow.

Connect the electrical supply cable.

Check the fusing (fuse) of your electrical supply according to the technical instructi-
ons regarding the total connected power of the grinding machine.
3.6.2 Grinding machines with speed regulated drive
Please check that the type of current, voltage and protection fuse correspond to the values specified. A pro-
tective earth ground wire connection must be available. Mains fuse 16A. Due to the design, the leakage cur-
rent is greater than 3,5 mA. We ask for due attention while executing machine tests within the framework of
industrial safety guidelines.
Since a direct current may be caused by the frequency converter in the protective earthing conductor, if an
upstream residual current device (ELCB / RCD) is required in the network, the following guidelines must be
followed:
To avoid an operating fault, you need an AC/DC-sensitive ELCB. Be absolutely sure which leakage current
security is necessary for dangerous body currents, as regulated in DIN VDE 0100 part 410, at your mains
connection.
3.6.3 When the ELCB triggers

Pulse current - sensitive ELCB type A
ELCB type A independent of rated voltage, for triggering when changing fault currents and
pulsing DC fault currents.

AC/DC - sensitive ELCB type B
ELCBs of series type B also accept the detection of smooth AC fault currents as well
as the detection of fault current shapes of type A; they are therefore suitable for all the
circuits mentioned. ELCBs of this series therefore detect all types of fault current according to the trigger-
ing characteristic B, i.e. both smooth DC fault currents and also all AC fault currents of all frequencies
and mixed frequencies up to 1 MHz are detected and switched off reliably in the event of a fault.

Alternating current - sensitive ELCBs of type AC (only alternating current) are unsuitable for
frequency converters. Alternating current - sensitive ELCBs of type AC are not customarily
used and are no longer permitted in Germany.
3.7 Operation

Always before you start grinding, you must check whether the workpiece is free of oil, grease and paint
residues. This makes smudging or soiling of the grinding wheels is prevented.

Pay attention to the condition of the grinding wheels. Are the grinding wheels dirty or muddied, they must
be roughened or replaced.

Grind the workpiece possibly first with the coarse grinding wheel before and afterwards with the fine grin-
ding wheel.
The workpiece support can be adjusted for certain grinding operations. By loosening the clamping screw you
can adjust the workpiece support.

Note that the possible loading absorption of the workpiece support is reduced by the adjustment.

The distance between the grinding wheel and workpiece support must be as low as possible.

Practice only a slight pressure on the workpiece.

Check the state of the grinding wheels. If they are dirty or muddied, they must be scraped clean or
replaced.
EN GZ grinding machines
32 Translation of original instruction Version 1.0.2 - 2021-5-5