Danfoss VLT FC 102 User Manual page 8

Safety
WARNING
LEAKAGE CURRENT HAZARD (>3.5 mA)
2 2
Leakage currents exceed 3.5 mA. Failure to ground the
drive system properly can result in death or serious
injury. Follow national and local codes regarding
protective earthing of equipment with a leakage current
>3.5 mA. Frequency converter technology used in the
drive system implies high frequency switching at high
power. This switching generates a leakage current in the
ground connection. A fault current in the drive system at
the output power terminals sometimes contains a DC
component, which can charge the filter capacitors and
cause a transient ground current. The ground leakage
current depends on various system configurations
including RFI filtering, shielded motor cables, and drive
system power.
If the leakage current exceeds 3.5 mA, EN/IEC61800-5-1
(Power Drive System Product Standard) requires special
care. Grounding must be reinforced in 1 of the following
ways:
•
Ensure the correct grounding of the equipment
by a certified electrical installer.
•
Ground wire of at least 10 mm
•
Two separate ground wires, both complying
with the dimensioning rules.
See EN 60364-5-54 § 543.7 for further information.
WARNING
EQUIPMENT HAZARD
Contact with rotating shafts and electrical equipment
can result in death or serious injury.
•
Ensure that only trained and qualified personnel
are allowed to perform startup or maintenance.
•
Ensure that electrical work conforms to national
and local electrical codes.
•
Follow the procedures in this manual.
CAUTION
INTERNAL FAILURE HAZARD
Missing or incorrectly placed safety covers in the drive
system can result in serious injury.
•
Ensure that all safety covers are in place and
securely fastened before applying power.
6
®
VLT Parallel Drive Modules
UNINTENDED MOTOR ROTATION
WINDMILLING
Unintended rotation of permanent magnet motors
creates voltage and can charge the capacitors in the
drive system, resulting in death, serious injury, or
equipment damage.
•
DISCONNECT POWER BEFORE SERVICING
Sometimes during installation, AC mains power is
applied but then must be disconnected to change the
line connections. In that case, disconnect the drive
system from the AC mains, 230 V supply, and motor
lines. After the lines have been disconnected, wait 30
minutes for the capacitors to discharge. Failure to follow
these steps can result in death or serious injury.
2 (7 AWG).
Danfoss A/S © 08/2017 All rights reserved.
WARNING
Ensure that permanent magnet motors are
blocked to prevent unintended rotation.
WARNING
MG37L202