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Safety Technology
14.1.4 Safety Notes
DANGER
If external force influences are to be expected with the safety function "Safe Tor-
que Off", e.g. in case of a vertical axis, this motion has to be safely prevented by
additional measures, e.g. a mechanical brake or a weight compensation.
DANGER
The STO function does not disconnect the voltage of the main and auxiliary cir-
cuits from the drive. Therefore maintenance work on electrical parts of the drive
or the motor can only be carried out after isolating the drive system from the
main supply.
WARNING
Even if the control unit has been safely locked, momentary axis motion, depend-
ing on the number of poles of the motor, can be triggered, when two errors are
occurring simultaneously in the power section with the voltage DC bus being ac-
tive:
Breakdown of a power semiconductor and
●
Breakdown of another semiconductor
●
In this case, two of six semiconductors are affected in such a way that the motor
shaft is aligning.
CAUTION
It is not recommended to stop the drive using the STO function. If a running
drive is stopped with STO, the drive will trip and stop by coasting. If this is not
acceptable, the drive and machinery must be stopped using the appropriate
stopping mode before using STO.
Bosch Rexroth AG R912005854_Edition 09
Rexroth Frequency Converter EFC x610
Lethal injury and / or property damage caused
by unintended axis motion!
High electrical voltage! Danger to life, risk of in-
jury due to electric shock!
Injury and / or property damage caused by devi-
ation from standstill position!
Risk of injury and material damage due to im-
proper operation!
Series
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