Operating Instructions

Safety
Residual risks
3
13 |
118
Siemens
A5E36496664A_f
Smart Infrastructure 2021-10-11
3.5 Residual risks
A description is given below of the residual risks potentially posed by variable
speed drives even when they are used for their intended purpose.
Please observe the safety information provided below and safety guidance
contained in other sections of these Operating Instructions in order to reduce the
risk to personnel and property and prevent potentially hazardous situations.
3.5.1 Voltage hazards
DANGER
Danger to life due to live parts and components!
The capacitors and the line and motor terminals may conduct hazardous voltages
even when the device is not in service and is disconnected from the line.
Electric shocks and short-circuits may occur if personnel come into contact with
live parts, spill liquids on them or touch them with objects.
● Only work on electrical devices when you are qualified for this job.
● Avoid any contact with live parts, spilling liquids on them or touching them
with objects.
● After switching off the power supply, wait at least 5 minutes before opening
the device.
● Take additional external measures if there is a risk of short-circuits; for
example, independent limit switches or mechanical interlocks, etc.
● De-energize the connected machine:
- Switch off the machine.
- Wait until the discharge period stated on the warning notices has elapsed.
- Check that it really is in a no-voltage condition, from phase conductor to
phase conductor and phase conductor to protective conductor.
- Check whether the existing auxiliary supply circuits are de-energized.
- Make sure that motors cannot move.
● Isolate or neutralize all hazardous energy sources, e.g. by closing switches,
grounding or short-circuiting.
● Secure the energy sources against switching on again.
DANGER
Danger to life due to
hazardous voltages when an unsuitable power supply
is connected!
Touching live components can cause electric shock and short circuit.
● Only use power supplies that provide SELV (Safety Extra Low Voltage) or
PELV (Protective Extra Low Voltage) output voltages for all connections and
terminals of the electronics modules.