the necessary time has elapsed before
commencing repair work.
Warning against unintended start
1.
The motor can be stopped with digital
commands, bus commands, references or a local
stop, while the frequency converter is connected
to mains. If personal safety considerations (e.g.
risk of personal injury caused by contact with
moving parts following an unintentional start)
make it necessary to ensure that no unintended
start occurs, these stop functions are not
sufficient. In such cases, disconnect the mains
supply.
2.
The motor may start while setting the
parameters. If this means that personal safety
may be compromised, motor starting must be
prevented, for instance by secure disconnection
of the motor connection.
3.
A motor that has been stopped with the mains
supply connected, may start if faults occur in the
electronics of the frequency converter, through
temporary overload or if a fault in the power
supply grid or motor connection is remedied. If
unintended start must be prevented for personal
safety reasons, the normal stop functions of the
frequency converter are not sufficient. In such
cases, disconnect the mains supply.
4.
In rare cases, control signals from, or internally
within, the frequency converter may be activated
in error, be delayed, or fail to occur entirely.
When used in situations where safety is critical,
e.g. when controlling the electromagnetic brake
function of a hoist application, do not rely on
these control signals exclusively.
WARNING
High Voltage
Touching the electrical parts may be fatal–even after the
equipment has been disconnected from mains.
Make sure that all voltage inputs have been discon-
nected, including load sharing (linkage of DC
intermediate circuit), as well as motor connection for
kinetic back up.
Systems where frequency converters are installed must,
if necessary, be equipped with additional monitoring
and protective devices according to valid safety
regulations, such as laws on mechanical tools,
regulations for the prevention of accidents, etc. Modifi-
cations to the frequency converters via the operating
software are allowed.
NOTICE
Hazardous situations shall be identified by the machine
builder/integrator responsible for considering necessary
preventive means. Additional monitoring and protective
devices may be included, always according to valid
national safety regulations, such as laws on mechanical
tools and regulations for the prevention of accidents.
WARNING
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, could result in death or serious
injury.
1.
Stop the motor.
2.
Disconnect AC mains, permanent magnet type
motors, and remote DC-link power supplies,
including battery back-ups, UPS, and DC-link
connections to other frequency converters.
3.
Wait for the capacitors to discharge fully, before
performing any service or repair work. The
duration of waiting time is specified in
Voltage [V]
Minimum waiting time (minutes)
4
15
380–480
0.37–7.5 kW
11–75 kW
High voltage may be present even when the warning LEDs are
off.
Table 1.2 Discharge Time
1.4 Disposal Instruction
Equipment containing electrical
components may not be disposed of
together with domestic waste.
It must be collected separately with
electrical and electronic waste according
to local and currently valid legislation.
1.5 Document and Software Version
This manual is regularly reviewed and updated. All
suggestions for improvement are welcome.
Edition
Remarks
Software version
MG06B4xx
Replaces MG06B3xx
1.4x
Introduction
Design Guide
MG06B402
Danfoss A/S © 09/2014 All rights reserved.
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