KEB COMBIVERT M4 Instruction Manual page 45

A trouble-free and safe operation of the frequency inverter is only guaranteed
Prevent
when the connection instructions below are strictly followed. Incorrect operation
Disturbances
or damage may result from incorrect installation.
– Note mains voltage and rated motor voltage.
– Install power cables and control cables separately (> 15cm separation).
– Use shielded/twisted control lines. Connect shield to PE at inverter only.
– Only use suitable circuit elements to control the logic and analog inputs, whose
contacts are rated for extra-low voltages.
– Make sure inverter and motor housing are well grounded. The screen of the
cable between the inverter and the motor must be directly and securely attached
to both the inverter PE terminal and the motor ground terminal. Remove paint
finish where necessary.
– Connect the braking module/ braking resistor with shielded/twisted cables
(install shield on one side of the inverter).
– Ground the cabinet or the system earth star point with the shortest connection
to mains earth (avoid earth loops).
If personnel protection is required during installation of the system the frequency
RCD
inverters must be protected according to EN 50178 (VDE 0160):
(FI-Protective
– 1-phase inverters by RCD type A (pulse-current sensitive FI's) or type B (all-
Switch)
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.
Operating Instuctions
Before starting, all respective enclosures must be secured again, as well as the
terminals and screws must be checked to see that they are securely fixed.
Inverters/servo drives may be set, dependent on type, to restart automatically
Automatic
following a fault stoppage (e.g. Undervoltage Error), when the fault conditions
Restart
clear. System design must take this into account, if appropriate, and additional
monitoring or protective features added where necessary.
The frequency inverters/servo drives are conditionally short-circuit proof (EN
Conditionally
50178). After resetting the internal protection devices, the function as directed
Short-Circuit
is guaranteed.
Proof
Exceptions:
– If an earth-leakage fault or short-circuit often occurs at the output, it can lead
to a defect in the unit.
– If a short-circuit occurs during regenerative operation (2nd or 4th quadrant,
feedback into the intermediate circuit), it can lead to a defect in the unit.
Safety and Application Instructions
GB - 7