Danfoss VLT AutomationDrive FC 301 Series Design Manual page 155

Electrical Installation
9.8 Safety
9.8.1 High Voltage Test
Carry out a high voltage test by short-circuiting terminals
U, V, W, L , L and L . Energize maximum 2.15 kV DC for
1 2 3
380–500 V adjustable frequency drives and 2.525 kV DC for
525–690 V adjustable frequency drives for one second
between this short-circuit and the chassis.
WARNING
When running high voltage tests of the entire instal-
lation, interrupt the line power and motor connection if
the leakage currents are too high.
9.8.2 EMC Grounding
Proper EMC grounding practice
•
Respect safety grounding.
•
Keeping the ground connection as short as
possible results in the best EMC performance.
•
Wires with greater square have a lower
impedance and better EMC grounding.
•
In cases where multiple devices with metal
cabinets are used, mount them on common
metal mounting plate to improve EMC
performance.
NOTICE!
If necessary, use washers for fastening bolts, e.g., in case
of painted parts.
CAUTION
POTENTIAL HAZARD IN THE EVENT OF INTERNAL
FAILURE
Risk of personal injury when the adjustable frequency
drive is not properly closed.
•
Before applying power, ensure all safety covers
are in place and securely fastened.
MG33BF22
Design Guide
Rev. 2014-04-04 All rights reserved.
9 9
153