First Commissioning; Electrical Connection; Current In The Protective Earth Conductor - Optimum optimill MH25V Betriebsanleitung

OPTIMUM
M A S C H I N E N - G E R M A N Y
3.5

First commissioning

WARNING!
First commissioning may only take place after proper installation.
First commissioned of the milling machine by inexperienced personnel constitute a risk
to personnel and equipment. We do not accept any liability for damages caused by
incorrectly performed commissioning.
ATTENTION!
Before commissioning the machine, all bolts, fastenings and protections must be
checked and retightened as necessary!
WARNING!
The use of improper tool holders or their operation at inadmissible speeds constitutes a
hazard.
Only use the tool holders (e.g. drill chuck) which were delivered with the machine or
which are offered as optional equipment by OPTIMUM.
Only use tool holders in the intended admissible speed range.
Tool holders may only be modified in compliance with the recommendation of OPTIMUM
or the clamping device manufacturer.

"Personnel qualification" on page 51
3.6

Electrical connection

CAUTION!
Position the power lead for the machine in such a manner that people cannot trip over it.
Please check whether the type of current, voltage and protection fuse correspond to the values
specified. A protective earth conductor connection must be available. Mains fuse 16A. With an
internal EMC filter, whether the leakage current is greater than 3.5 mA. We ask for due atten-
tion to industrial safety guidelines while carrying out machine tests.

3.6.1 Current in the protective earth conductor

The magnitude of the leakage current in the protective earth conductor depends on whether the
internal EMC filter in the Emerson M200 frequency converter is used to control the speed of the
milling spindle or not. The standard frequency converter is fitted with an internal EMC filter.
Instructions on how to remove the internal filter can be found in the converter manual.

With the EMC filter, the leakage current is 15.4 mA AC at 230V 50Hz (single phase supply,
phase-neutral power supply, neutral point earthed).

Without an EMC filter, the leakage current is < 1.9 mA (phase-neutral power supply, neu-
tral point earthed).
Therefore, a fixed earth connection is required and the minimum cross section of the protective
earth conductor must comply with local safety regulations for devices with high leakage cur-
rent. This is achieved by providing a permanent fixed earthing connection with two independ-
ent conductors, each having a cross section the same as or greater than that of the mains lead.
To simplify this, the converter is provided with two earth terminals. Both earthing connections
are required to comply with the EN 61800-5-1 standard.
Since the frequency converter can cause a direct current in the protective earthing conductor,
the following guidelines must be followed, if an upstream residual current detector (ELCB/RCD)
is required in the network:
There are three common FI types (ELCB/RCD):

AC - to detect AC fault currents
GB MH25V
Page 64 Original operating instructions Version 1.0.1 dated 2015-12-17