WARNING
Warning against unintended start
1.
The motor can be brought to a stop by means of 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 machine parts following an unintentional start) make it necessary to ensure that
no unintended start occurs, these stop functions are not sufficient. In such cases the mains supply must be dis-
connected or the
Safe Stop
function must be activated.
2.
The motor may start while setting the parameters. If this means that personal safety may be compromised (e.g.
personal injury caused by contact with moving machine parts), motor starting must be prevented, for instance by
use of the
Safe Stop
function or 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 (e.g. risk of injury caused by contact
with moving machine parts), the normal stop functions of the frequency converter are not sufficient. In such cases
the mains supply must be disconnected or the
Safe Stop
function must be activated.
Consequently, disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be inadvertently energized. Failure to follow recommendations could
result in death or serious injury.
1. Control signals from, or internally within, the frequency converter may in rare cases 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, these control signals must not be relied on ex-
clusively.
Note
When using the
Safe Stop
function, always follow the instructions in the
Safe Stop
section of the Design Guide.
WARNING
Disconnect all electric power, including remote disconnects. Follow proper lockout/tagout procedures to ensure the
power cannot be inadvertently energized. Verify with an appropriate voltmeter that the unit is discharged. Failure to
disconnect power and ensure unit is discharge before servicing could result in death or serious injury.
Also make sure that other voltage inputs have been disconnected, such as external 24 V DC, load sharing (linkage of
DC intermediate circuit), as well as the 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 the valid safety regulations, e.g law on mechanical tools, regulations for the prevention
of accidents etc. Modifications on the frequency converters by means of the operating software are allowed.
Failure to follow recommendations could result in death or serious injury.
Hoisting applications:
The frequency converter functions for controlling mechanical brakes cannot be considered as a primary safety
circuit. There must always be a redundancy for controlling external brakes.
Introduction
18 TR200 Programming Guide
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