2. Safety instructions for electrical drives and controllers
16 Festo P.BE-CMMS-AS-HW-EN en 0708NH
Safety of machines – basic concepts, general
guidelines
Safety of machines – guidelines for risk evaluation
Safety of machines – avoiding unintentional start-
ing
Safety-relevant parts of controllers
2.4.2 Safety instructions for assembly and maintenance
For assembling and maintaining the system, the relevant DIN, VDE, EN and IEC regulations,
as well as all national and local safety and accident prevention regulations must always be
observed. The system manufacturer or the user is responsible for ensuring that these regu-
lations are observed.
Warning
The operation, maintenance and/or commissioning of the motor
controller may only be carried out by trained qualified personnel
and with electrical appliances suited for this work.
Avoiding accidents, bodily injury and/or material damage:
Warning
The series-supplied motor holding brake or an external motor-
holding brake controlled by the drive controller alone is not suit-
able for protecting human beings.
Vertical axes must be additionally secured against falling or
sliding down when the motor is switched off with e.g.
- mechanical locking of the vertical axis,
- external braking, safety catch or clamping devices or
- sufficient weight compensation of the axis.
Warning
The internal brake resistance can cause dangerous intermediate
circuit voltage during operation and up to several minutes after the
motor controller is switched off. If touched, this can lead to fatal or
serious injuries.
Before carrying out maintenance work, make sure that the
power supply is switched off and locked and that the intermedi-
ate circuit is discharged.
Switch the electrical equipment free of voltage via the main
switch and make sure that it cannot be switched on again. Wait
until the intermediate circuit is discharged after
- maintenance work and repairs
- cleaning
- long periods out of use
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