Siemens SIMOTICS M-1FE2, Configuration Manual

Page: 121 / 162

Connecting
8.2 Electrical connection
SIMOTICS M-1FE2 built-in motors
Configuration Manual, 05/2021, A5E50494252B AB
119
8.2.1.7 High-voltage test
DANGER
Lethal voltage hazards
A dangerous voltage is present at the motor during a high-voltage test. Death or serious
injury can result when live parts are touched.
•
Do not touch any live parts.
• Adhere to the fundamental safety instructions.
NOTICE
Destruction of electronic components and damage to the insulation
A high-voltage test on the motor can damage the insulation of the motor and destroy
electronic components, e.g. temperature sensors.
•
Use maximum 80% of the test voltage in accordance with EN 60034-1.
• Prior to the test, short-circuit the cable ends of the temperature sensors.
Before being shipped, the stators of the built-in motors are subject to a high-voltage test in
compliance with EN 60034-1.
However, the Standards Commission recommends that when electrical components (such as
built-in motors) are installed, a new high-voltage test according to EN 60034-1 should be
performed after the final assembly has been completed.
8.2.2 Voltage limitation (applies to synchronous motors only)
Note
EMF (Electro Motive Force) > 820 V
In a fault situation, a voltage limitation of the DC-link voltage on the converter is required.
The voltage limit depends on the maximum EMF (induced phase-to-phase voltage peak
> 820 V).
Voltage limiting is required if you operate the motor with a speed n > n
max inv
.
If the power fails (line voltage) at a speed > n
max inv
of the motor, or the converter pulses are
canceled as a result of the power failure, then the synchronous motor feeds a high voltage
back into the DC link. The voltage protection detects a DC link voltage that is too high
(DC > 820 V) and short-circuits the 3 motor feeder cables. The energy remaining in the motor
is converted into heat as a result of the short-circuit and causes the motor to quickly brake.
The VPM (Voltage Protection Module) is used as voltage limiter for SINAMICS S120.