OPTIMUM
M A S C H I N E N - G E R M A N Y
Assembly and commissioning
Version 1.0.1 dated 2016-02-23
Page 32
Original operating instructions
MZ4
│
MZ4V
GB
Due to the design, 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.
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.
ATTENTION!
When delivered the machine is equipped with a plug for electrical connection. It only
serves for acceptance and test purposes. In order to operate the machine it is necessary
to remove this plug and to connect the machine directly with a power supply.
Firmly connect the machine to the terminal box. It is not allowed to connect the machine using a
standard 16A CEE plug, since the stray current of the frequency converter is exceeding the
admissible value of 3.5mA (refer to EN 50178 / VDE 5.2.11.1).
ATTENTION!
Depending on the quality of the network, there is a risk of machine malfunctions under
extreme conditions. If necessary and in order to exclude retroactive effects on the
internal power supply system, the operator should install a line filter on the machine.
Therefore, at workplaces with lots of powerful consumers, it might also be necessary to
use a system for network compensation. Please consult your electricity supplier
regarding this.
ATTENTION!
Frequency converters (drive regulators) might trigger the Fl circuit breaker of your
electrical supply. In order to avoid malfunction, an Fl circuit breaker switch sensitive to
pulse current or to universal current may be required.
3.5.4 Current in the Protective Earth Ground Wire
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
A - to detect AC fault currents and pulsating DC fault currents (provided the DC current
reaches zero at least once every half cycle).
B - to detect AC fault currents, pulsating DC fault currents and smooth DC residual currents.
Type AC should never be used in converters.
Type A can only be used for single-phase converters.
Type B must be used for 3-phase converters.
When using an external EMC filter, to avoid false error shutdowns, a time delay of at least 50
ms is required. The leakage current can exceed the threshold trigger value for an error shut-
down if the phases are not switched on at the same time.
Line systems
The machine is designed for TN and TT line systems with a grounded neutral point.
Prohibited operation
Operation on TN line systems with grounded external conductors is prohibited.
Operation on TT line systems without grounded neutral points is prohibited.
