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3.5
First commissioning
WARNING!
The machine may only be placed into operation after proper installation.
If the milling machine is operated initially by inexperienced personnel, you endanger
people and the machine. We cannot accept liability for damages caused by incorrectly
performed operation.
ATTENTION!
Before initially operating the machine, check all screws, fixtures and/or safety devices
and tighten up the screws if necessary!
WARNING!
Risk by using improper tool holders or operating them at inadmissible speeds.
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 of the manufacturer of the clamping devices.
Qualification of personnel on page 11
3.6
Electrical connection
CAUTION!
Install the connection cable of the machine in such a way that people will not stumble
over it.
Please verify if the type of current, voltage and protection fuse correspond to the values speci-
fied. A protective earth ground wire connection must be available. Main Fuse 16A. With an
internal EMC filter the leakage current is greater than 3.5 mA. We ask for due attention while
executing machine tests within the framework of industrial safety guidelines.
3.6.1
Current in the Protective Earth Ground Wire
The degree of the leakage current in the protective earthing conductor depends on whether the
internal EMC filter in the Emerson M200 frequency converter is used for spindle rotation speed
control or not. The standard frequency converter is fitted with an internal EMC filter. Instructions
on how to remove the internal filter is in the converter manual.
With the EMC filter, the leakage current is 15.4 mA AC 230V 50Hz (1 phase supply, phase-
neutral power supply, neutral point earthed).
Without an EMC filter, the leakage current is <1.9 mA (phase-neutral power supply, neutral
point earthed).
Therefore, a fixed earth connection is required and the minimum cross section of the protective
earthing conductor must conform to 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 the power supply cord or greater. To
simplify this, the converter is provided with two earth terminals. Both earthing connections are
required to comply with the standard EN 61800-5-1.
Since a direct current may be caused by the frequency converter in the protective earthing con-
ductor, if an upstream residual current device (ELCB / RCD) is required in the network, the fol-
lowing guidelines must be followed:
There are three common types of FI (ELCB / RCD):
AC - to detect AC fault currents
EN
MH25SV
24
Translation of original operating manual
Version 1.0.4 - 2020-12-15
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