4
Installation
Installation notes
14
Operating Instructions Basic Unit – MOVITRAC
®
B
Shielding and
earthing
•
Shield the control cables and use the shield clamps.
•
Connect the shield by the shortest possible route and make sure it is earthed over a wide area
at both ends.
•
You can ground one end of the shield via a suppression capacitor (220 nF / 50 V) to avoid
ground loops.
•
If using double-shielded cables, ground the outer shield on the inverter end and the inner shield
on the other end.
•
Provide high frequency compatible earthing for MOVITRAC
®
B and all additional units
(wide area metal-on-metal contact between the heat sink and ground with unpainted switch
cabinet mounting panel).
•
Any crossovers of control cable and power cables must be at a right angle.
•
You can also use earthed sheet-metal ducts or metal pipes to shield the cables.
IT systems
•
SEW recommends using
earth-leakage monitors with pulse code measuring
in voltage
supply systems with a non-earthed star point (IT systems). Use of such devices prevents the
earth-leakage monitor mis-tripping due to the earth capacitance of the inverter.
•
For size 0, SEW recommends deactivating the interference suppressor filter using the
enclosed insulation discs (see next section).
Contactor
•
Only use contactors in utilization category AC-3 (EN 60947-4-1).
Cross-sections
•
Supply system lead:
Cross-section according to rated input current
I
Mains
at rated load.
Motor cable:
Cross-section according to rated output current
I
N
.
Electronics cables:
Maximum 1.5 mm
2
(AWG16) without conductor end sleeves
Maximum 1.0 mm
2
(AWG17) with conductor end sleeves
Cable lengths for
individual drives
The line lengths depend on the PWM frequency. The permitted motor line lengths are listed in the
"Project Planning" section of the MOVITRAC
®
B System Manual.
Unit output
•
Only connect an
ohmic/inductive load (motor)
; do not connect a capacitive load!
Braking resistor
connection
•
Cut the lines to the required length.
•
Use
2 tightly twisted leads or a 2-core shielded power cable
. Cross-section according to
the rated output current of the inverter.
•
Protect the braking resistor with a
bimetallic relay
with trip class 10 or 10A (wiring diagram).
Set the
trip current
according to the
technical data of the braking resistor
.
•
For braking resistors in the
BW..-T
series, you can connect the
integrated thermostat using
a 2-core, shielded cable
as an
alternative
to a bimetallic relay.
•
The
flat-design braking resistors
have internal thermal overload protection (fuse cannot be
replaced). Install the
flat-design braking resistors
together with the appropriate
touch guard
.
Binary outputs
•
Binary outputs
are
short-circuit proof
and
interference-voltage-proof
up to 30 V.
Higher external voltages can destroy the binary outputs.
Interference
emission
•
Use shielded motor lines for an EMC compliant installation.
Switched
inductances
•
Use suppressors to suppress interference on contactors, relays, solenoid valves, etc.
•
The minimum distance to the inverter must be 150 mm.
