SEW MOVITRAC LTE-B series, Operating Instructions Manual

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Operating Instructions – MOVITRAC® LTE-B
23
4
Electrical installation
Installation
4.3.2 Installation
Connect the inverter as shown in the following wiring diagrams. Ensure proper wiring in
the motor terminal box. Two basic connections are distinguished: Star connection and
delta connection. It is essential that you make sure that the motor is connected with the
voltage source in such a way that it is supplied with the proper operating voltage. You
find more information in the figure in section "Connection in the motor terminal box"
(page 24).
It is recommended that you use a 4-core PVC-insulated and shielded cable as the power
cable. Route this cable according to the applicable national regulations of the industry
sector as well as the rules and standards. Conductor end sleeves are required for con-
necting the power cables to the inverter.
The grounding terminal of each MOVITRAC
®
LTE-B inverter must be connected individ-
ually and directly to the ground busbar (mass) of the installation site (via filter, if avail-
able). Do not loop the ground connections of MOVITRAC
®
LTE-B inverters from one in-
verter to the other. Neither route the ground connections to the inverters from other in-
verters. The impedance of the ground circuit must comply with the local safety regula-
tions of the industry sector. To comply with UL regulations, all ground connections must
be designed with UL-listed crimping type ring cable lugs.
Permitted voltage
supply systems • Voltage supply systems with grounded star point
MOVITRAC
®
LTE-B inverters are designed for operation on TN and TT systems with
directly grounded star point.
• Voltage supply systems with non-grounded star point
Operation on voltage supply systems with non-grounded star point (for example IT
systems) is also permitted. For this purpose, SEW-EURODRIVE recommends to use
an earth-leakage monitor according to the pulse-code measurement principle. Using
these devices avoids the earth-leakage monitor from tripping by mistake due to the
missing capacitance to ground of the inverter.
• Outer conductor grounded voltage supply systems
On voltage supply systems, the inverters may only be operated with a maximum
phase-to-ground AC voltage of 300 V.
Line contactors and line fuses
Line contactors
Use only line contactors in utilization category AC-3 (EN 60947-4-1).
It is important that a minimum time interval of 120 seconds is adhered to between two
voltage supply system activations.
Line fuses Fuse types:
• Line protection types in operation classes gL./ gG:
– Nominal fusing voltage ≥ nominal line voltage
– The nominal fusing current must be designed for at least 100% of the nominal in-
verter current depending on the inverter utilization.
• Power circuit breaker with characteristics B, C:
– Nominal circuit breaker voltage ≥ nominal line voltage
– The nominal currents of the power circuit breakers must be 10% higher than the
nominal inverter current.