2 Safety
2.1 Safety
The following symbols are used in this document:
WARNING
Indicates a potentially hazardous situation which could
result in death or serious injury.
CAUTION
Indicates a potentially hazardous situation which could
result in minor or moderate injury. It may also be used
to alert against unsafe practices.
NOTICE!
Indicates important information, including situations that
may result in damage to equipment or property.
2.2 Qualified Personnel
Correct and reliable transport, storage, installation,
operation and maintenance are required for the safe
operation of the frequency converter. Only qualified
personnel are allowed to install or operate this equipment.
Qualified personnel is defined as trained staff, who are
authorised to install, commission, and maintain equipment,
systems and circuits in accordance with pertinent laws and
regulations. Additionally, qualified personnel are familiar
with the instructions and safety measures described in this
document.
2.3 Safety Precautions
WARNING
HIGH VOLTAGE
Adjustable frequency drives contain high voltage when
connected to AC line input power. Qualified personnel
only should perform installation, start-up, and
maintenance. Failure to have qualified personnel perform
installation, start-up, and maintenance could result in
death or serious injury.
WARNING
UNINTENDED START
When the adjustable frequency drive is connected to AC
line power, the motor may start at any time. The
adjustable frequency drive, motor, and any driven
equipment must be in operational readiness. Failure to
be in operational readiness when the adjustable
frequency drive is connected to AC line power could
result in death, serious injury, equipment, or property
damage.
WARNING
DISCHARGE TIME
Adjustable frequency drives contain DC link capacitors
that can remain charged even when the adjustable
frequency drive is not powered. To avoid electrical
hazards, disconnect AC line power, any permanent
magnet type motors, and any remote DC link power
supplies, including battery backups, UPS and DC link
connections to other adjustable frequency drives. Wait
for the capacitors to fully discharge before performing
any service or repair work. The wait time required is
listed in the
Discharge Time
table. Failure to wait the
specified time after power has been removed before
doing service or repair could result in death or serious
injury.
Voltage [V] Power range (hp [kW])
Minimum waiting time
(min)
380–500
175–350 [132–250 kW]*
20
425–850 [315–630 kW]
40
Table 2.1 Discharge Times
*Power ranges are for normal overload operation.
Safety
VLT
®
AutomationDrive FC 302 Low Harmonic Drive
132–630 kW
20
Danfoss A/S © Rev. 04/2015 All rights reserved.
MG37A322
2
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