2
Integrated safety technology
Limitations
Manual – MOVIGEAR
®
B
11
2.4
Limitations
WARNING
The safety concept is only suitable for performing mechanical work on driven sys-
tem/machine components.
When the STO signal is disconnected, the line voltage is still present at the DC link
of the MOVIGEAR
®
drive unit.
•
Before working on the electric part of the drive system, disconnect it from the
supply voltage using an appropriate external disconnecting device and secure it
against unintentional reconnection to the voltage supply.
•
MOVIGEAR
®
has no mechanical brake. This means coasting of the drive depends
on the application (subject to friction and mass moment of inertia of the system). In
case of regenerative loads, the drive can even accelerate. This must be taken into
account in a risk assessment of the system/machine. Additional safety measures
might have to be implemented (e.g. safety brake system).
→ MOVIGEAR
®
cannot be used without an additional brake system for applica-
tion-specific safety functions that require active deceleration (braking) of the dan-
gerous movement.
•
When using the SS1(c) function as described in chapter "Safety functions", the
brake ramp of the drive is not monitored with respect to safety. In case of a fault,
the drive might not be decelerated after the delay time, or it might be accelerated
in the worst case. In this case, the STO function (see chapter "Safety functions") is
only activated after the set time delay has elapsed. The resulting danger must be
taken into account in the risk assessment of the system/machine. Additional safety
measures might have to be implemented.
22746250/EN – 12/2016
