moog
MSD Servo Drive DC-AC Operation Manual
24
Id.-No.: CA97554-001 Date: 06/2012
3.4 Protective conductor connection
Step
Action
PE mains connection
to DIN EN 61800-5-1
1.
Ground every servo drive!
When operating with power supply
unit:
•
Interconnect the PE terminals of the
DC-AC servo drives (up to and including
Size 5) and the power supply unit by the
ready made-up cables.
•
Connect the PE terminal of the power
supply unit and DC-AC servo drive Size 6A
directly to the PE rail (main ground) in the
switch cabinet.
When operating with AC-AC servo
drive as supply:
•
Interconnect the PE terminals of the
DC-AC servo drives by the ready made-up
cables.
•
Do NOT connect the PE terminal of the
DC-AC servo drive to a PE terminal of the
supplying single-axis drive, but directly
to the PE rail (main ground) in the switch
cabinet.
•
Connect the supplying single-axis drive
likewise directly to the PE rail (main
ground) in the switch cabinet.
Rules for the PE terminal (as leak-
age current >3.5 mA):
Use protective conductors with the
same cross-section as the mains
power cables, though at least
10 mm² copper.
Also comply with local and na-
tional regulations and conditions.
2.
Connect the protective conductor terminals
of all other components, such as mains filter*
etc., in a
star configuration
to the PE rail
(main ground) in the switch cabinet.
*) Components are only required
for the MSD Power Ssupply Unit.
You will find a wiring diagram, also showing the protective conductor terminals, on
page 28.
3.5 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.
You therefore need a separate control supply, compliant with the requirements of a
SELV/PELV.
The opposite overview shows the potential supplies for the individual terminals in detail.
This concept also delivers higher operational safety and reliability of the servo drive.
ATTENTION!
A special case with regard to insulation and isolation is terminal
X5 (motor PTC). In this regard refer to the notes in section 3.13 "Motor con-
nection“ startting on page 35.
!
