3. Verify absence of operating voltage.
4. Ground and short-circuit.
5. Provide protection against adjacent live parts.
To energize the system, apply the measures in reverse order.
2.4
Safe handling
Danger as a result of high voltages from external supplies
Even if the circuit breaker is open, parts of the converter can be under voltage (live) as a result
of the auxiliary voltage at the premagnetization, precharging or demagnetization transformers.
This danger is not limited to the converter, but can also occur with components that are
electrically connected to the converter (e.g. circuit breakers or isolators). Touching live parts
can result in death, serious injury, and damage to property.
● Isolate all components that can feed voltage to the converter before commencing work.
Danger due to high voltage in operation
When operating this equipment very high voltages develop. Even after switching off the mains
voltage, or while the connected machine is still turning, high voltages can remain for a
prolonged length of time. High voltages can cause death or serious injury if the safety rules are
not observed or if the equipment is handled incorrectly.
● Operate the converter properly.
● Always observe the "The five safety rules (Page 15)" when carrying out any work.
● Only remove the covers using the methods described by these operating instructions.
● Maintain the converter regularly and correctly.
● After you have switched off the supply voltage, do not carry out any maintenance or repair
work until the one minute discharge time for the RC snubber circuit capacitor has elapsed.
Danger as a result of induced voltage
Rotating machinery can induce dangerous high voltages and synchronous motors that are not
de-excited immediately can also pose a hazard. If the connection to the motor is not isolated or
grounded, these voltages can also remain. Touching live parts can result in death or serious
injury.
● Before opening the doors, wait until the connected machine has come to a standstill.
Safety information
2.4 Safe handling
SINAMICS GL150 6SL38502UM114PA0Z
16
Operating Instructions Rev.201910281441 EXAMPLE
