Motor Power Company DUET_FL 48/10, User Manual

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Page 187
EMERGENCY OFF (stop category 0):
In an EMERGENCY OFF situation, the safety chain is activated. Depending on the actual machine, the
safety chain comprises various elements, e.g. EMERGENCY OFF buttons, key-operated switches,
start buttons etc. The ECS also checks the safety chain for faults, such as line breaks, short-circuits
etc. In the event of an error or if the chain is open, it ensures that K1 is switched off safely. The mains
power supply for the 48 V power supply unit will be interrupted.
The connection example shown may differ from the actual connection depending on the required
safety category:
The connection example shown in Figure 44
→
fulfils the requirements of EN 954, safety category 1
The connection example shown in Figure 44 may be extended by a second power contactor and an
ECS unit in accordance with EN 954, safety category 3
→
fulfils the requirements of EN 954, safety
category 3.
After the disconnection of the mains power supply, there is still some residual energy in
the intermediate circuit capacitors of the 48 V power supply unit and of the DUET_FL.
The elimination of this energy by internal discharging resistors in the DUET_FL and in the
power supply unit takes some time (duration: > 5 minutes).
With U
DC bus
= 50 V, the electrical energy per DUET_FL unit is: P
C, DC bus
≈
0.7 Ws
In applications where this is not acceptable, the intermediate circuit has to be quickly
discharged with the help of an additional contact connected to K1 and a suitably rated
discharging resistor.
EMERGENCY STOP (stop category 1):
An additional contact set in the ECS also disconnects the controller enabling signal from the DUET_FL.
The drives decelerate along the quick-stop ramp to zero speed. Then the DUET_FL switches the
output stage off.
The connection example shown may differ from the actual connection depending on the required
safety category:
The connection example shown in Figure 44
→
fulfils the requirements of EN 954, safety category 1
The connection example shown in Figure 44 as well as drives with a holding brake, delayed
disconnection of the 24 V logic supply of the DUET_FL through the ECS. ECS in accordance with EN
954, safety category 3
→
fulfils the requirements of EN 954, safety category 3.
DANGER !
The EMERGENCY OFF and EMERGENCY STOP wiring described herein is only one
possible realization example. Depending on the application, broader or completely
different regulations concerning the design of these functions may apply.
The machine manufacturer or the project manager has to gather all the necessary
information concerning the actual safety requirements, work out a safety concept for the
system and then select the connection and the components accordingly.
User Manual DUET_FL „DUET_FL 48/10“ Version 1.1 Motor Power Company