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6Digitax ST User Guide
Issue: 5
1 Safety Information
1.1 Warnings, Cautions and Notes
A Note contains information which helps to ensure correct operation of
the product.
1.2 Electrical safety - general warning
The voltages used in the drive can cause severe electrical shock and/or
burns, and could be lethal. Extreme care is necessary at all times when
working with or adjacent to the drive.
Specific warnings are given at the relevant places in this guide.
1.3 System design and safety of personnel
The drive is intended as a component for professional incorporation into
complete equipment or a system. If installed incorrectly, the drive may
present a safety hazard.
The drive uses high voltages and currents, carries a high level of stored
electrical energy, and is used to control equipment which can cause
injury.
Close attention is required to the electrical installation and the system
design to avoid hazards either in normal operation or in the event of
equipment malfunction. System design, installation, set-up and
maintenance must be carried out by personnel who have the necessary
training and experience. They must read this safety information and this
guide carefully.
The STOP and Safe Torque Off functions of the drive do not isolate
dangerous voltages from the output of the drive or from any external
option unit. The supply must be disconnected by an approved electrical
isolation device before gaining access to the electrical connections.
With the sole exception of the Safe Torque Off function, none of the
drive functions must be used to ensure safety of personnel, i.e.
they must not be used for safety-related functions.
Careful consideration must be given to the functions of the drive which
might result in a hazard, either through their intended behavior or
through incorrect operation due to a fault. In any application where a
malfunction of the drive or its control system could lead to or allow
damage, loss or injury, a risk analysis must be carried out, and where
necessary, further measures taken to reduce the risk - for example, an
over-speed protection device in case of failure of the speed control, or a
fail-safe mechanical brake in case of loss of motor braking.
The Safe Torque Off function has been approved by IFA as meeting the
requirements of the following standards, for the prevention of
unexpected starting of the drive:
EN 61800-5-2:2007 SIL 3
EN ISO 13849-1:2006 PL e
EN 954-1:1997 Category 3 (This standard is withdrawn and
should not be used for new designs, information provided for legacy
applications only).
The Safe Torque Off function may be used in a safety-related
application. The system designer is responsible for ensuring that the
complete system is safe and designed correctly according to the
relevant safety standards.
1.4 Environmental limits
Instructions regarding transport, storage, installation and use of the drive
must be complied with, including the specified environmental limits.
Drives must not be subjected to excessive physical force.
1.5 Access
Access must be restricted to authorized personnel only. Safety
regulations which apply at the place of use must be complied with.
1.6 Fire protection
The drive enclosure is not classified as a fire enclosure. A separate fire
enclosure must be provided. For details regarding fire protection please
refer to section 3.2.5 Fire protection on page 15.
1.7 Compliance with regulations
The installer is responsible for complying with all relevant regulations,
such as national wiring regulations, accident prevention regulations and
electromagnetic compatibility (EMC) regulations. Particular attention
must be given to the cross-sectional areas of conductors, the selection
of fuses or other protection, and protective ground (earth) connections.
Within the European Union, all machinery in which this product is used
must comply with the following directives:
2006/42/EC: Safety of machinery.
2004/108/EC: Electromagnetic Compatibility.
1.8 Motor
Ensure the motor is installed in accordance with the manufacturer’s
recommendations. Ensure the motor shaft is not exposed.
The values of the motor parameters set in the drive affect the protection
of the motor. The default values in the drive should not be relied upon.
It is essential that the correct value is entered in Pr 0.46 motor rated
current. This affects the thermal protection of the motor.
1.9 Mechanical brake control
The brake control functions are provided to allow well co-ordinated
operation of an external brake with the drive. While both hardware and
software are designed to high standards of quality and robustness, they
are not intended for use as safety functions, i.e. where a fault or failure
would result in a risk of injury. In any application where the incorrect
operation of the brake release mechanism could result in injury,
independent protection devices of proven integrity must also be
incorporated.
1.10 Adjusting parameters
Some parameters have a profound effect on the operation of the drive.
They must not be altered without careful consideration of the impact on
the controlled system. Measures must be taken to prevent unwanted
changes due to error or tampering.
1.11 Electrical installation
1.11.1 Electric shock risk
The voltages present in the following locations can cause severe electric
shock and may be lethal:
• AC supply cables and connections
• DC bus, dynamic brake cables and connections
• Output cables and connections
• Many internal parts of the drive, and external option units
Unless otherwise indicated, control terminals are single insulated and
must not be touched.
1.11.2 Isolation device
The AC supply must be disconnected from the drive using an approved
isolation device before any cover is removed from the drive or before
any servicing work is performed.
1.11.3 STOP function
The STOP function does not remove dangerous voltages from the drive,
the motor or any external option units.
A Warning contains information which is essential for
avoiding a safety hazard.
A Caution contains information which is necessary for
avoiding a risk of damage to the product or other equipment.
