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Safety
2 Safety
2
2
2.1 Safety Symbols
The following symbols are used in this manual:
WARNING
Indicates a potentially hazardous situation that could
result in death or serious injury.
CAUTION
Indicates a potentially hazardous situation that could
result in minor or moderate injury. It can also be used to
alert against unsafe practices.
NOTICE
Indicates important information, including situations that
can result in damage to equipment or property.
2.2 Qualified Personnel
Correct and reliable transport, storage, and installation are
required for the trouble-free and safe operation of the
®
VLT
Parallel Drive Modules. Only qualified personnel are
allowed to install this equipment.
Qualified personnel are defined as trained staff, who are
authorized to install equipment, systems, and circuits in
accordance with pertinent laws and regulations. Also, the
personnel must be familiar with the instructions and safety
measures described in this manual.
2.3 Safety Precautions
WARNING
HIGH VOLTAGE
The drive system contains high voltage when connected
to AC mains input. Failure to ensure that only qualified
personnel install the drive system can result in death or
serious injury.
6
®
VLT
Parallel Drive Modules
DISCHARGE TIME
The drive module contains DC-link capacitors. Once
mains power has been applied to the drive, these
capacitors can remain charged even after the power has
been removed. High voltage can be present even when
the warning indicator lights are off. Failure to wait 20
minutes after power has been removed before
performing service or repair work can result in death or
serious injury.
1.
2.
3.
4.
LEAKAGE CURRENT HAZARD (>3.5 mA)
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 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 contain 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/IEC 61800-5-1
(Power Drive System Product Standard) requires special
care.
Grounding must be reinforced in 1 of the following ways:
•
•
•
See EN 60364-5-54 § 543.7 for further information.
Danfoss A/S © 6/2016 All rights reserved.
WARNING
Stop the motor.
Disconnect AC mains and remote DC-link
supplies, including battery back-ups, UPS, and
DC-link connections to other drives.
Disconnect or lock the PM motor.
Wait 20 minutes for the capacitors to discharge
fully before performing any service or repair
work.
WARNING
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.
2
(6 AWG).
MG37N102
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