Safety
2 Safety
2
2
2.1 Safety Symbols
The following symbols are used in this document:
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, installation,
operation, and maintenance are required for the trouble-
free and safe operation of the frequency converter. Only
qualified personnel are allowed to install or operate this
equipment.
Qualified personnel are defined as trained staff, who are
authorised to install, commission, and maintain equipment,
systems, and circuits in accordance with pertinent laws and
regulations. Additionally, the qualified personnel must be
familiar with the instructions and safety measures
described in this document.
2.3 Safety Precautions
WARNING
HIGH VOLTAGE
Frequency converters contain high voltage when
connected to AC mains input, DC power supply, or load
sharing. Failure to perform installation, start-up, and
maintenance by qualified personnel can result in death
or serious injury.
•
Installation, start-up, and maintenance must be
performed by qualified personnel only.
4
Installation Guide
UNINTENDED START
When the frequency converter is connected to AC mains,
DC power supply, or load sharing, the motor may start at
any time. Unintended start during programming, service
or repair work can result in death, serious injury, or
property damage. The motor can start by means of an
external switch, a serial bus command, an input
reference signal from the LCP or LOP, via remote
operation using MCT 10 software, or after a cleared fault
condition.
To prevent unintended motor start:
DISCHARGE TIME
The frequency converter contains DC-link capacitors,
which can remain charged even when the frequency
converter is not powered. Failure to wait the specified
time after power has been removed before performing
service or repair work, can result in death or serious
injury.
Danfoss A/S © Rev. 07/2014 All rights reserved.
WARNING
•
Disconnect the frequency converter from mains.
•
Press [Off/Reset] on the LCP, before
programming parameters.
•
The frequency converter, motor, and any driven
equipment must be fully wired and assembled
when the frequency converter is connected to
AC mains, DC power supply, or load sharing.
WARNING
•
Stop motor.
•
Disconnect AC mains and remote DC-link power
supplies, including battery back-ups, UPS, and
DC-link connections to other frequency
converters.
•
Disconnect or lock PM motor.
•
Wait for the capacitors to discharge fully, before
performing any service or repair work. The
duration of waiting time is specified in the
relevant frequency converter Operating
Instructions, Chapter 2 Safety.
MG90U402
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