KEB COMBIVERT F4-S/1.2, Applications Manual, Page: 7 / 96

Installation and Connection
7
ANTRIEBSTECHNIK
2 Connection
2.1 Connection Instructions
A trouble-free and safe operation of the frequecy inverter is only guaranteed when the
following connection instructions are observed. When deviated from malfunctions and
damages may occur in isolated cases.
•
KEB COMBIVERT is only intended for a stationary connection
(discharge current > 3.5mA).
•
Protective conductor cross section must be at least 10mm
2
copper or a 2nd
conductor must be electrically parallel to the protective conductor on separate
terminals (VDE 0160).
• Install electric power cable and control cable separately.
• Do not connect/disconnect the electric power cable and control cable when the
frequency inverter is energized.
•
Observe mains voltage and motor rated voltage.
•
Use shielded/drilled control lines. Shield on PE.
•
Connection of the control cables is only possible on switch and adjustment
elements (relay, switch, potentiometer), which are suited for low voltages.
• Use shielded motor cables. Lay extensive shield on the motor housing.
•
Connection of the braking module/braking resistor with shielded/drilled cables.
•
Ground frequency inverter (asteroid; avoid earth circuits; shortest connection
to main earth).
All control wires should be included in further protective measures (e.g. doubly
insulated or shielded, grounded and insulated), since this deals with voltages in
accordance with VDE 0160, which are not securely separated from the mains circuit,
because basic insulation is used.
2.2 RCD (FI-Protective Switch)
If personnel protection is required during installation of the system the frequency
inverters must be protected according to EN 50178 (VDE 0160):
– 1-phase inverters by RCD type A (pulse-current sensitive FI’s) or type B (all-current
sensitive FI’s)
– 3-phase inverters (with B6 bridge-connected rectifier) by RCMA’s with separation
(used privileged) or RCD’s type B (all-current sensitive FI’s)
The tripping current should be 300mA or more, in order to avoid a premature triggering
of the inverter by discharge currents (about 200mA).
Dependent on the load, the length of the motor cable and the use of a radio
interference filter, substantially higher leakage current can occur.
The connection instructions from the manufacturer and the valid local reqirements
must be observed.
Dependent on the available mains form (TN, IT, TT) further protective measures are
necessary in accordance with VDE Part 410 (Part 4; Chapter 41). For example, with
TN-mains this protection is made with overcurrent protective devices. With IT-mains it
is insulation monitoring with a pulse-code measuring method. A protective separation
can be used with all mains forms as long as the required power and cable lengths
permit this.