ABB 5SHY3545L0020 SCR control unit module
• The Prevention of unexpected start-up function (option +Q950) does not
remove the voltage from the main and auxiliary circuits.
• The Safe torque off function (option +Q967) does not remove the voltage from
the main and auxiliary circuits.
• At installation sites above 2000 m (6562 ft), the terminals of the RMIO board
and optional modules attached to the board do not fulfill the Protective Extra
Low Voltage (PELV) requirements stated in EN 50178.
WARNING! Ignoring the following instructions can cause physical injury, death,
increased electromagnetic interference and equipment malfunction:
• Ground the drive, motor and adjoining equipment to ensure personnel safety in
all circumstances, and to reduce electromagnetic emission and interference.
• Make sure that grounding conductors are adequately sized as required by
safety regulations.
• In a multiple-drive installation, connect each drive separately to protective
earth (PE).
• In the first environment, make a 360° high frequency grounding of motor cable
entries at the cabinet lead-through.
Note:
• Power cable shields are suitable for equipment grounding conductors only
when adequately sized to meet safety regulations.
• As the normal leakage current of the drive is higher than 3.5 mA AC or 10 mA
DC (stated by EN 50178, 5.2.11.1), a fixed protective earth connection is
required. In addition, we recommend that you use:
• a cross-section of the protective earthing conductor of at least 10 mm2 Cu or
16 mm2 Al,
or
• automatic disconnection of the supply in case of discontinuity of the
protective earthing conductor,
or
• a second protective earthing conductor of the same cross-sectional area as
the original protective earthing conductor.

Mechanical installation and maintenance
These instructions are intended for all who install and service the drive.
WARNING! Ignoring the following instructions can cause physical injury or death,
or damage to the equipment:
• Handle the unit carefully.
• The drive is heavy. Lift the drive by the lifting lugs only. Do not tilt the unit. The
unit will overturn from a tilt of about 6 degrees. Use extreme caution when
manoeuvring a drive that runs on wheels. An overturning unit can cause
physical injury.
• Beware of hot surfaces. Some parts, such as heatsinks of power
semiconductors, remain hot for a while after disconnection of the electrical
supply.
• Make sure that dust from borings and grindings does not enter the drive when
installing. Electrically conductive dust inside the unit may cause damage or
malfunctioning.
• Ensure sufficient cooling.
• Do not fasten the drive by riveting or welding.