Siemens 1PH818, Operating Instructions & Installation Instructions

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Commissioning
7
When carrying out any work on the machine, observe the general safety instructions
(Page 13) and the specifications contained in EN 50110‑1 regarding safe operation of electrical
equipment.
WARNING
Dangerous voltage at the motor terminals when the rotor is rotating
There is always a magnetic flux in the motor due to the permanent magnets in the rotor. With
each rotation of the rotor, a voltage occurs at the motor terminals. As a result of this, there is
also a voltage at the converter output terminals via the connecting cable. Contact with them
can cause death, serious injury or material damage.
● When working on the drive system, you must prevent any rotational movement of the
motor shaft.
See also
The five safety rules (Page 13)
WARNING
Driving the motor via the system
When the permanent magnet rotor is a driven, a voltage ("rotor voltage") is induced in the
stator winding, that can be measured at the motor terminals. If a cable or converter short-
circuit occurs, then a short-circuit current is driven by the induced rotor voltage. The motor
can rotate unexpectedly at any time,
which can result in death, serious injury, or material damage.
● If it is possible for the motor to be passively driven during system operation, ensure that
short-circuit-resistant cables are used.
● Optionally, you can use circuit breakers near the motor for protecting the sections of cable
during a short circuit.
WARNING
Dangerous voltage via the converter
As long as the feeding converter is switched on, or the DC link of the converter is not
discharged, there can be a voltage at the motor terminals even when the rotor is not moving.
Depending on the converter type, the voltage is up to 1000 V. When coming into contact, this
can result in death, serious injury, and material damage.
● Maintain the five safety rules (Page 13)at all times when operating the machine.
SIMOTICS M-1PH8 1PH818., 1PH822.
Operating Instructions 07/2016
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