GB - 8
Automatic
Restart
Conditionally
Short-Circuit
Proof
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):
-
3-phase inverters 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 Instructions
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.
The R4-S-regenerative unit may be set, dependent on type, to restart
automatically following a fault stoppage (e.g. Undervoltage Error), when the fault
conditions clear. System design must take this into account, if appropriate, and
additional monitoring or protective features added where necessary.
The R4-S-regenerative units are conditionelly short-circuit proof (EN 50178/
VDE 0160). After resetting the internal protection devices, the function as directed
is guaranteed. Exceptions:
• If an earth-leakage fault or short-circuit often occurs at the output, this can
lead to a defect in the unit.
• If a short-circuit occurs during regenerative operation, this can lead to a defect
in the unit.
Safety Instructions
