•
•
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3.3.2.2 Vibration and Shock
The drive has been tested according to the following standards:
IEC/EN 60068-2-6: Vibration (sinusoidal) - 1970
IEC/EN 60068-2-64: Vibration, broad-band random
The drive complies with the requirements that exist for units mounted on the walls and floors of production premises, and in panels
bolted to walls or floors.
3.3.3 Aggressive Environments
A drive contains many mechanical and electronic components. All are to some extent vulnerable to environmental effects.
C A U T I O N
INSTALLATION ENVIRONMENTS
Failure to take necessary protective measures increases the risk of stoppages, potentially causing equipment damage and per-
sonnel injury.
Do not install the drive in environments with airborne liquids, particles, or gases that may affect or damage the electronic
components.
Liquids can be carried through the air and condense in the drive and may cause corrosion of components and metal parts. Steam,
oil, and salt water may cause corrosion of components and metal parts. As an extra protection, coated printed circuit boards can be
ordered as an option (standard on some power sizes).
Airborne particles such as dust may cause mechanical, electrical, or thermal failure in the drive. A typical indicator of excessive levels
of airborne particles is dust particles around the drive fan. In dusty environments, use a cabinet for IP20/TYPE 1 equipment.
In environments with high temperatures and humidity, corrosive gases such as sulphur, nitrogen, and chlorine compounds cause
chemical processes on the drive components.
Such chemical reactions rapidly affect and damage the electronic components. In such environments, mount the equipment in a
cabinet with fresh air ventilation, keeping aggressive gases away from the drive. An extra protection in such areas is a coating of the
printed circuit boards, which can be ordered as an option.
Before installing the drive, check the ambient air for liquids, particles, and gases. This is done by observing existing installations in
this environment. Typical indicators of harmful airborne liquids are water or oil on metal parts, or corrosion of metal parts.
Excessive dust particle levels are often found on installation cabinets and existing electrical installations. One indicator of aggressive
airborne gases is blackening of copper rails and cable ends on existing installations.
3.4 General Aspects of EMC
3.4.1 Overview of EMC Emissions
Drives (and other electrical devices) generate electronic or magnetic fields that may interfere with their environment. The electro-
magnetic compatibility (EMC) of these effects depends on the power and the harmonic characteristics of the devices.
Uncontrolled interaction between electrical devices in a system can degrade compatibility and impair reliable operation. Interfer-
ence may take the form of mains harmonics distortion, electrostatic discharges, rapid voltage fluctuations, or high-frequency inter-
ference. Electrical devices generate interference along with being affected by interference from other generated sources.
Electrical interference usually occur at frequencies in the range 150 kHz to 30 MHz. Airborne interference from the drive system in
the range 30 MHz to 1 GHz is generated from the inverter, the motor cable, and the motor.
Capacitive currents in the motor cable coupled with a high dU/dt from the motor voltage generate leakage currents, as shown in
the following illustration.
The use of a shielded motor cable increases the leakage current (see the following illustration) because shielded cables have higher
capacitance to ground than unshielded cables. If the leakage current is not filtered, it causes greater interference on the mains in
the radio frequency range below approximately 5 MHz. Since the leakage current (I
1
) is carried back to the unit through the shield
(I
3
), there is only a small electromagnetic field (I
4
) from the shielded motor cable according to the following illustration.
AJ363928382091en-000101 / 130R0983 | 31
Danfoss A/S © 2021.04
Product Overview
VLT® Flow Drive FC 111
Design Guide