ABB ACS255 - 2. Safety; Safety in installation and maintenance; Safety in start-up and operation

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2. Safety
What this chapter contains
This chapter contains the safety instructions which you must follow when installing, operating and servicing the drive. If ignored,
physical injury or death may follow, or damage may occur to the drive, motor or driven equipment. Read the safety instructions before
you work on the unit.
Use of warnings
Warnings caution you about conditions which can result in serious injury or death and/or damage to the equipment and advice on how
to avoid the danger. The following warning symbols are used in this manual:
Electricity warning warns of hazards from electricity which can cause physical injury and/or damage to
the equipment.
General warning warns about conditions, other than those caused by electricity, which can result in
physical injury and/or damage to the equipment.
Safety in installation and maintenance
These warnings are intended for all who work on the drive, motor cable or motor.
Electricity safety
 Never work on the drive, motor cable or motor when input power is applied. After disconnecting the input power, always
wait for 10 minutes to let the intermediate circuit capacitors discharge before you start working on the drive, motor or motor
cable.
Always ensure by measuring with a multimeter (impedance at least 1 Mohm) that:
1. There is no voltage between the drive input phases L1, L2 and L3 and the ground.
2. There is no voltage between terminals + and BR and the ground.
 Do not work on the control cables when power is applied to the drive or to the external control circuits. Externally supplied
control circuits may carry dangerous voltage even when the input power of the drive is switched off.
 Do not make any insulation or voltage withstand tests on the drive.
 Be sure the system is properly grounded before applying power. Do not apply AC power before you ensure that all grounding
instructions have been followed. Electrical shock can cause serious or fatal injury
Note:
Even when the motor is stopped, dangerous voltage is present at the power circuit terminals L1, L2, L3 and U, V, W and + and BR.
WARNING! Ignoring the instructions can cause physical injury or death, or damage to the equipment.
Only qualified electricians are allowed to install and maintain the drive!