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Manual – MOVIDRIVE® MDX61B Safety Module Option MOVISAFE® DCS..B
3
Restrictions
Integrated Safety Technology
3.3 Restrictions
INFORMATION
• The system/machine manufacturer must perform a system/machine-specific risk
analysis. Using the MOVIDRIVE
®
B drive system must be considered for this pur-
pose.
• The safety concept is only suitable for performing mechanical work on the sys-
tem/machine components.
Before carrying out work on the electrical section of the drive system, the supply
voltage must be disconnected using an external maintenance switch/main switch.
• When the DC 24 V voltage supply is disconnected, mains voltage is still present on
the drive inverter's DC link.
• When using a thermistor, protection against restart is not guaranteed when the
thermistor is triggered. This must be taken into account during project planning for
the system/machine. Suitable measures might have to be implemented in addition.
• The brake control integrated in MOVIDRIVE
®
B and the standard brake of brake-
motors are not designed to be safety-relevant. They are not part of the above men-
tioned safety functions.
If the brake control and/or the motor brake fails, the drive can coast for much longer
(depending on the friction and inertia of the system). In case of regenerative loads
(e.g. lifting axes, declining conveying lines), the drive can even accelerate. This
must be taken into account for the risk analysis of the system/machine and pre-
vented by safety-relevant additional measures (e.g. safety braking system), if re-
quired.
MOVIDRIVE
®
B cannot be used without an additional brake system for application-
specific safety functions that require active deceleration (braking) of the dangerous
movement.
• When using the above described functions SS1(c)/SS2(c), the deceleration of the
drive is not monitored with respect to safety. In the event of a fault, the drive might
not be braked during the deceleration time, or it might even accelerate.
In this case, the STO function is only activated after the set time delay has passed.
The resulting danger must be taken into account for the risk analysis of the sys-
tem/machine. Additional safety measures have to be implemented if required.
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