10
Manual – MOVIAXIS® MMD60B - Functional Safety
2
Restrictions
Integrated Safety Technology
2.4
Restrictions
• The brake controller integrated in MOVIAXIS
®
MMD60B and the standard brake
integrated in brakemotors is not safety-related and therefore not part of the safety
functions mentioned above. If the brake controller and/or the motor brake fails, the
drive can coast for much longer depending on the application (i.e. 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 in
a risk assessment of the system/machine. Additional safety measures might have to
be implemented (e.g. safety brake system).
→
MOVIAXIS
®
MMD60B 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 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.
• A system/machine-specific risk assessment must be carried out through the
system/machine manufacturer and taken into account for the use of the drive system
with MOVIAXIS
®
MMD60B.
WARNING
The safety concept is only suitable for performing mechanical work on the system/
machine components.
When the 24 V power supply is disconnected, the line voltage is still present at the
frequency inverter DC link.
Severe or fatal injuries from electric shock.
• Before working on the electric part of the drive system, disconnect it from the
supply system using an appropriate external disconnecting device and secure it
against unintentional reconnection to the power supply.
