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Damage to property possible
If this information is not observed, the frequency converter could be damaged and destroyed during
subsequent commissioning!
Observe the following instructions during operation:
The motor parameters, especially the I2T settings, must be configured correctly to provide proper
motor overload protection.
The frequency converter features an internal motor overload protection. Motor overload protec-
tion can also be ensured via an external PTC/bimetallic switch.
The frequency converter must not be used as an "emergency stop device" (see DIN EN 60204-
1; VDE 0113-1:2007-06).
1.7.5 Maintenance and inspection
Frequency converters may only be maintained and inspected by trained electricians. Unless explicitly stated
in these instructions, modifications of hardware and software may only be carried out by persons authorised
by Gebrüder BECKER GmbH.
1.7.5.1
Cleaning of frequency converters
Frequency converters are maintenance-free if operated as intended. If the air contains dust, the cooling
fins of the motor and frequency converter must be cleaned regularly.
1.7.5.2
Measuring the insulation resistance at the control terminals
An insulation test on the control board's input terminals is not permitted.
1.7.5.3
Measuring the insulation resistance at the power terminals
The power component of the VAU is tested with 1.9 kV during series testing.
Should the insulation resistance need to be measured during a system test, this can be done under the
following conditions:
An insulation test may only be carried out for the power component.
To avoid excessively high voltages, all the connection cables of the VAU must be disconnected before
testing,
A 500 V DC insulation tester should be used.
Fig. 4: Insulation test at the power component