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Operating Instructions – MOVIAXIS® MX Multi-Axis Servo Inverter
4
Electrical Installation
Installation
Connecting brak-
ing resistors
• Protect the braking resistor with an
overload relay
, see figure 47. Set the
trip cur-
rent
according to the
technical data of the braking resistor
, see page 199.
• SEW-EURODRIVE recommends to connect the braking resistor as shown in figure
46. Install switch F16 close to the unit system. If an unshielded cable is used for con-
necting switch F16 with the supply module, keep the length as short as possible.
Preferably use a shielded line cable or drilled individual lines as connecting cable to
the braking resistor. The cross section must be selected depending on the rated cur-
rent of the braking resistor.
Operating brak-
ing resistors
• The connection leads to the braking resistors carry a
high DC voltage of about
900 V
during rated operation.
Binary inputs /
binary outputs
• The
binary inputs
are electrically
isolated
by optocouplers.
Permitted volt-
age supply sys-
tems
• MOVIAXIS
®
is intended for operation on voltage supply systems with a directly
grounded star point (TN and TT power systems). Operation on voltage supply sys-
tems with a non-grounded star point (for example IT power systems) is permitted. In
such a case, SEW-EURODRIVE recommends using earth-leakage monitors em-
ploying pulse-code measurement. Use of such devices prevents the earth-leakage
monitor mis-tripping due to the earth capacitance of the servo drive.
• No EMC limits are specified for interference emission in voltage supply systems with-
out a grounded star point (IT systems). The effectiveness of line filters is severely lim-
ited.
WARNING
The surfaces of the braking resistors will reach temperatures of up to 250° C when the
braking resistors are loaded with P
rated
.
Risk of burns and fire.
• Choose a suitable installation location. Braking resistors are usually mounted on top
of the control cabinet.
• Do not touch any braking resistor.
STOP
The
binary outputs
are
short-circuit proof
but
not interference-voltage-proof
.
Externally applied voltages can damage the binary outputs.
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