SEW-Eurodrive MOVIFIT MC, Manual, Page: 7 / 32

2
MOVIFIT
®
MC safety concept
Functional description
Manual – Functional Safety
7
2 MOVIFIT
®
MC safety concept
The described safety technology of the MOVIFIT
®
device has been developed and
tested in accordance with performance level d to EN ISO 13849‑1:2015.
This was certified by TÜV Nord. Copies of the TÜV certificate and the corresponding
report are available from SEW‑EURODRIVE on request.
2.1 Functional description
The MC design of the MOVIFIT
®
acts as a power distributor and communication inter-
face for controlling up to 3 MOVIMOT
®
drives. MOVIFIT
®
MC allows for the connection
of an external safety controller (or an external safety relay). If the connected emer-
gency stop device (e.g. emergency off button with latching function) is activated, the
safety controller disconnects the 24 V supply voltage that is required for creating a ro-
tating field for the connected MOVIMOT
®
drive.
The 24V_P supply voltage (safety-related 24 V supply voltage) is connected in the
ABOX at the X29 terminal and fed to the EBOX via a plug strip. The EBOX houses
electronic components, such as a short-circuit protection, voltage monitor, RS485
transceiver and coupler. The safety-related 24V_P supply voltage is routed through a
polarity protection diode at the input of the EBOX. A switch-mode power supply
(SMPS) generates 5 V voltage from the safety-related 24 V voltage for the RS485
transceiver and the coupler. Short-circuit protection of the positive pole of the safety-
related 24 V voltage protects the contactor tracks of the MOVIFIT
®
and the hybrid
cables connected to the MOVIFIT
®
. In the ABOX, the safety-related 24 V voltage is
distributed to the terminal strips X71, X81, and X91 or the plug connectors X7, X8, and
X9. The terminal strips of plug connectors serve to connect the respective MOVIMOT
®
drives. Further, the RS+, RS- signals and the supply system cables L1, L2, L3 are for-
warded to the MOVIMOT
®
drives.
For the connection between the terminal strips X71, X81, and X91 or the plug con-
nectors X7, X8, and X9 and the MOVIMOT
®
drives, SEW‑EURODRIVE recommends
prefabricated hybrid cables that have been designed and shielded especially for this
purpose.
The connected MOVIMOT
®
inverters can de-energize all active elements that are re-
quired for creating pulse trains at the power output stage (IGBT) if the safety-related
24 V supply voltage is disconnected. This ensures that the MOVIMOT
®
inverter no
longer supplies power to the motor for generating torque.
External connection via a controller that
• Is approved for at least PL d according to EN ISO 13849-1
• Disconnects with at least PL d according to EN ISO 13849-1
MOVIFIT
®
MC devices can be used with:
• Safe Torque Off according to EN 61800‑5‑2
• Safe Stop 1 according to EN 61800-5-2
• Restart inhibit in accordance with EN ISO 14118
• In compliance with performance level d according to EN ISO 13849-1.
MOVIFIT
®
MC supports stop categories 0 and 1 according to EN 60204-1.
29157056/EN – 09/2019