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Description
3.5 Description of the components
3.5.3
Terminal Modules
The Terminal Modules are the central interface for digital and analog inputs and outputs. You
can optionally expand the interface to include additional Terminal Modules.
3.5.4
Precharging
To prevent overcurrents and temporary overvoltages in the DC link when the line voltage is
connected, the DC-link capacitors must be precharged. The DC link is precharged via the
auxiliary supply.
The precharging circuit comprises the following components:
● Precharging transformer
● Diode bridge
● Precharging resistors
● Contactor for switching on and off
● Circuit-breaker
Detailed information about interconnecting the precharging components is provided in the
circuit manual. The component mounting locations are provided in the layout diagram.
Designation
Precharging time
Precharging current in three-phase 400 V supply
with 4.16 kV parallel connection and 6 kV
with 2.3 kV; 3.3 kV; and 4.16 kV single connection
Discharging time of the DC link T
1)
3.5.5
Electromechanical door interlock system
The electromechanical door interlock system is designed to protect personnel, and is an
integral part of the safety concept. During operation and when the make-proof grounding switch
is open, all the doors are interlocked (with the exception of the door for the control section).
The electromechanical door interlock system ensures that the doors for the power unit cannot
be opened when the DC link voltage is above a defined threshold value. The control only
releases the door interlocking once the circuit breaker is safely open and the grounding switch
is closed. You can open the doors once released by the control.
The device cannot be switched on again until all the doors are closed. The doors remain
interlocked if the auxiliary voltage fails. For more information, refer to the Chapter
"Maintenance"
36
1)
The precharging time can vary depending on the system
1)
DISCH
Operating Instructions Rev.201910281332 EXAMPLE
SINAMICS GM150 6SL3810-2LN31-8AA2
Value
25 s
30 A
20 A
≈ 300 s
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