High-Voltage Test; Voltage Limiting - Siemens SIMOTICS M-1FE1 Configuration Manual

Electrical connection
8.3 System integration
8.3.1.6

High-voltage test

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.
8.3.2

Voltage limiting

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
If the power fails (line voltage) at a speed > n
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.
114
DANGER
of the motor, or the converter pulses
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SIMOTICS M-1FE1 synchronous built-in motors
Configuration Manual, 09/2019, A5E47872980B AA
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