21
ServoA
Operation Manual
Electrical installation
ID no.: LDS-O-SA-EN-202103
3.6 Electrical isolation method
The control electronics, with its logic (μP), the encoder terminals and the inputs and outputs,
are electrically isolated from the power section (power supply/DC-link). All control terminals are
designed as safety extra-low voltage/protective extra-low voltage (SELV/PELV) circuits and must
only be operated with such SELV/PELV voltages, as per the relevant specification. This provides
reliable protection against electric shock on the control side.
A separate control supply, compliant with the requirements of a SELV/PELV, is therefore needed.
The opposite overview shows the potential supplies for the individual terminals in detail.
This concept also delivers higher operational safety and reliability of the drive controller.
SELV = Safety Extra Low Voltage
PELV = Protective Extra Low Voltage
3.5 Protective conductor connection
Step
Action
PE-mains connection
to DIN EN 61800-5-1
1.
Ground each of the drive controllers!
Connect terminal in star configura-
tion and across a wide area to the PE
rail (main ground) in the switch cabinet.
Rules for the PE terminal as leakage
current >3.5 mA):
Use protective conductors with the
same cross-section as the mains
power cables, though at least 10
mm
2
.
Also comply with local and na-
tional regulations and conditions
for equipment with high leakage
current. The minimum cross-section
of the protective earth conductor
must comply with the local safety
requirements for protective earth
conductors for equipment with high
leakage current.
2.
Also connect the protective conduc-
tor terminals of all other components,
such as line reactors, filters etc. in star
configuration and across a wide area on
the PE rail (main ground) in the switch
cabinet.
Figure 3.8 Star configuration layout of the PE conductor
W 1
V 2
W 2
U 2
U 1
V 1
W 1
V 2
W 2
U 2
U 1
V 1
W 1
V 2
W 2
U 2
U 1
V 1
PE
Содержание ServoA SA52.0100
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