Safety
2 Safety
2.1 Safety Symbols
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
The products may only be assembled, installed,
programmed, commissioned, maintained, and decommis-
sioned by persons with proven skills. Persons with proven
skills
•
are qualified electrical engineers, or persons who
have received training from qualified electrical
engineers and are suitably experienced to
operate devices, systems, plant and machinery in
accordance with the general standards and
guidelines for safety technology
•
are familiar with the basic regulations concerning
health and safety/accident prevention
•
have read and understood the safety guidelines
given in this manual and also the instructions
given in the Operating Instructions of the
frequency converter.
•
have a good knowledge of the generic and
specialist standards applicable to the specific
application
Users of PDS(SR)s are responsible for
•
hazard and risk analysis of the application
•
identifying safety functions required and
allocating SIL or PLr to each of the functions
•
other subsystems and the validity of signals and
commands from them
•
designing appropriate safety-related control
systems (hardware, software, parameterisation,
etc.)
®
VLT
Frequency Converters - Safe Torque Off Operating Instructions
Protective Measures
•
•
•
•
2.3 Safety Precautions
See the Safety Chapter in the relevant Operating
Instructions for general safety precautions.
CAUTION
After installation of STO, a commissioning test as
specified in chapter 4.5 Safe Torque Off Commissioning
Test must be performed. A passed commissioning test is
mandatory after first installation and after each change
to the safety installation.
WARNING
If external forces act on the motor e.g. in case of vertical
axis (suspended loads) - and an unwanted movement,
for example caused by gravity, could cause a hazard, the
motor must be equipped with additional measures for
fall protection. For example, mechanical brakes must be
installed additionally. Risk of death and serious injury.
WARNING
Safe Torque Off (i.e. removal of 24 V DC voltage supply
to terminal 37) does not provide electrical safety. The
Safe Torque Off function itself is not sufficient to
implement the Emergency-Off function as defined by EN
60204-1. Emergency-Off requires measures of electrical
isolation, e.g. by switching off mains via an additional
contactor. Risk of death and serious injury.
MG37D102 - Rev. 2013-11-15
Safety engineering systems may only be installed
and commissioned by qualified and skilled
personnel
Install the frequency converter in an IP54 cabinet
as per IEC 60529 or in an equivalent environment.
In special applications a higher IP degree may be
necessary
Ensure short-circuit protection of the cable
between terminal 37 and the external safety
device according to ISO 13849-2 table D.4
When external forces influence the motor axis
(e.g. suspended loads), additional measures (e.g.,
a safety holding brake) are required to eliminate
hazards
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