4.10 Phase synchronization during supply system switching
Damage to the machine may be caused when switching to another supply system with different
phasing.
● The phasing must be synchronized during switching. Use appropriate means to
synchronize the phasing.
4.11 System-inherent frequencies
Excessively high vibration levels and system resonances can damage the machine set.
● Configure and match the system consisting of the foundation and machine set in such a
way that no system resonances can arise and result in the permissible vibration levels being
exceeded.
● The vibration limit values according to DIN ISO 10816-3 must not be exceeded.
4.12 Torsional loading of the shaft assembly
In the event of faults in the electrical connection, such as line switching operations with a
residual field or short circuit at the terminals, excessive air gap torques can occur. These
excessive air gap torques can lead to additional mechanical torsional loads on the shaft
assembly.
If the configuration does not correctly recognize the mechanical torsional loadings of the shaft
assembly, this can lead to serious damage to the machine. This can result in death, serious
injury or material damage.
● When planning the system, make due allowance for the maximum air gap torques that can
occur. This data can be found in the "Electrical data".
The system planner is responsible for the entire drive train.
4.13 Switching high-voltage motors
If vacuum circuit breakers and vacuum contactors are used, then what are known as multiple
restrikes can occur when the machine is switched off. This depends on various factors, such
as:
● Arc-extinguishing principle of the switch
● Machine size
● Length of the power supply cable
● System capacitance, etc.
A surge suppressor to ground is installed in the switchgear between the circuit breaker and
the cable termination for each of the three conductors. The level of protection for the machine
windings is sufficient when the limiter is correctly selected (machine rated voltage / response
voltage).
Preparations for use
4.10 Phase synchronization during supply system switching
SIMOTICS HV M 1RN76308PR900CG0-Z
26 Operating Instructions 07/2018
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