Connecting
5.2 Permissible line system types
SIMOTICS S-1FG1 servo geared motor
108
Operating Instructions, 07/2019, A5E47360747B AA
WARNING
Danger to life as a result of hazardous voltages when connected to inadequately grounded
line supplies
Connecting a motor to an inadequately grounded line supply can result in death, severe
injury and damage to the motor if a fault occurs.
•
Connect motors, as part of the drive system, to TN and TT line supplies with a grounded
neutral point or to IT line supplies.
•
Ensure that the SINAMICS devices and motors are compatible with the residual current
device according to EN 61800-5-1 before you connect the devices and motors to the
line supply using residual current devices (RCDs).
•
For line supplies with grounded line conductor, e.g. TT line supplies, use an isolating
transformer with grounded neutral point (on the secondary side) between the line supply
and the drive system, so that the motor insulation is not overstressed.
•
When connected to IT line supplies, a monitoring device must signal the first fault
between an active part and ground. Eliminate this fault immediately.
5.2
Permissible line system types
In combination with the drive system, the motors are generally approved for operation on TN
and TT systems with grounded neutral and on IT systems.
In operation on IT systems, the occurrence of a first fault between an active part and ground
must be signaled by a monitoring device. According to IEC 60364-4-41, it is recommended
that the first fault is removed as quickly as is practically possible.
In systems with a grounded external conductor, an isolating transformer with grounded
neutral (secondary side) must be connected between the line supply and the drive system to
protect the motor insulation from excessive stress. The majority of TT systems have a
grounded external conductor, so in this case an isolating transformer must be used.
5.3
Circuit diagram
The circuit diagram contains information about wiring and connecting the motor winding.
Figure 5-1
Circuit diagram
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