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2.6 Mechanical Installation Precautions
W A R N I N G
EXPLOSIVE ATMOSPHERE
Installing the drive in a potentially explosive atmosphere can lead to death, personal injury, or property damage.
Install the unit in a cabinet outside of the potentially explosive area.
Use a motor with an appropriate ATEX protection class.
Install a PTC temperature sensor to an ATEX PTC-Thermistor device to monitor the motor temperature.
Install short motor cables.
Use sine-wave output filters when shielded motor cables are not used.
2.7 Electrical Installation Precautions
Before you do electrical work on the drive, lock out and tag out all power sources to the drive.
W A R N I N G
INDUCED VOLTAGE
Induced voltage from output motor cables that run together can charge equipment capacitors, even with the equipment turned
off and locked out/tagged out. Failure to run output motor cables separately or to use shielded cables could result in death or
serious injury.
Run output motor cables separately or use shielded cables.
Simultaneously lock out/tag out all the drives.
Protective earth connection and RCD requirements
A properly dimensioned protective earth (PE) setup is essential for the safety of the drive system protecting the user against electri-
cal shock. The PE connections of the drive installation ensure that the drive system remains safe preventing that the single fault
currents will generate any hazardous voltages on accessible conductive part, for example, conductive enclosure parts.
The VLT® AutomationDrive EZ FC 321 shall be installed according to the requirement for PE connection and supplementary protec-
tive bonding as specified in IEC/EN 60364-5-54 cl. 543 and 544.
For the automatic disconnection, if there is a fault at the motor side, it shall also be ensured that the impedance of the PE connec-
tion between drive and motor is sufficiently low to ensure compliance with IEC/EN 60364-4-41 cl. 411 or 415. The impedance is
verified by initial and periodic test according to IEC 60364-4-41.
In some regions, extra local requirements apply and must be adhered to.
The suitability for connection of PE and protective bonding of accessible conductive parts according to IEN/EN 60364-5-54 to the
drive is ensured by following the design according to IEC/EN 61800-5-1.
Where the FC 321 is used as a component inside specific applications, special requirement for proper connection to the PE may
apply, for example, IEC/EN 60204 and IEC/EN 61349-1.
AN354546796134en-000201 / 130R0954 | 7
Danfoss A/S © 2021.05
Safety Instructions
VLT®AutomationDrive EZ FC 321
Installation Guide
