Rcd (Fi-Protective Switch) - KEB COMBIVERT F5 Betriebsanleitung

1.3.2 RCD (FI Protective
Switch)
Diagram of a low-voltage distribution board (principle of protective elements)
Net
To further
distribution lines
Output 1
Output 2
Output 3
Level 1
Level 2
If the protection of individuals is required during the setup of systems the frequency
inverter must be secured in accordance with EN 50178 (VDE 0160) as follows:
• 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 sepa-
rator (to use with preference) or RCD's type B (all-current sensitive FI's)
The tripping current of the RCD should be 300mA or more, in order to avoid prema-
ture triggering of the inverter through discharge currents of the frequency inverter
(about 200mA). Dependent on the load, the length of the motor cable and the use
of a radio interference filter, substantially higher leakage currents can occur. The
connection instructions from the manufacturer and the valid local requirements
must be observed.
Dependent on the available network configuration (TN, IT, TT) further protective
measures are necessary in accordance with VDE 0100 Part 410 (Part 4; Chapter
41). With TN networks this e.g. protection by overcurrent devices, with IT networks
isolation monitoring with pulse-code measuring procedures. A protective separation
can be used with all network configurations as long as the required power and cable
lengths permit this.
Type
A
To further consumers which do not pre-
vent the triggering of the FI.
The KEB COMBIVERT can be connected at outer conductor grounded systems
(e.g. delta systems) with the following restrictions:
• the classification of the control as „save separated circuit" are to be execut-
ed
• the specified measures of „basic insulation" are to be executed
• the max. voltage phase/earth may not exceed absolutely 500 V with this
network configuration
RCD
Type A
RCMA/
sel. T
RCD
Type B
Type
A
To the non-FI compatible
consumers.
Separator
according to
EN 60947-2
7