9.3 Opening the device
The drive is equipped with a door interlocking system. Depending on the design, this is an
electromechanical door interlocking system or optionally a safety locking system.
WARNING
High voltages although the door interlocking has been released
Even when the door interlocking is released, high voltages can still be present at the auxiliary
circuits (fans, anti-condensation heating, closed-loop control, etc.). Touching live components
can result in death or serious injury.
● Ensure that work is only carried out by qualified personnel.
● The five safety rules must be observed.
The doors cannot be opened until the following conditions are fulfilled:
● The converter is ready to switch on, or in the "switching on inhibited" state, no ON command
is active.
● The circuit breaker is open (feedback signal, "circuit-breaker OPEN").
● The "zero voltage criterion" in the DC link is fulfilled.
● The "zero voltage criterion" at the phase connection is fulfilled.
● None of the cell controls supplies status information.
The cell electronics no longer operate below a cell voltage of 200 V. As a consequence,
status information is no longer transferred to the control.
● The cell electronics no longer functions.
Up to the residual discharge (<5 V), the system waits for 5x the time constant of the
discharge resistor and cell capacitor. For the components being used, this results in a time
constant of at least 14 minutes.
WARNING
High voltages after shutdown
After shutdown, high voltages are present at the converter and its components. Furthermore,
if the connection to the machine or the line supply is not disconnected and grounded, these
voltages can persist. Touching live components can result in death or serious injury.
● Never force the doors open during operation or while the DC link capacitors are being
discharged.
● The five safety rules must be observed.
If the auxiliary voltage fails, you can only unlock the doors manually. To unlock the doors,
proceed as described in the chapter titled "Preparation for use".
Maintenance
9.3 Opening the device
SINAMICS SM120 6SL38855?B
Operating Instructions 12/2015 95
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