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Engineering
01/02 AWB8230-1415GB
16
Protection of persons and domestic animals with residual-
current protective devices
Residual-current circuit breakers (RCCBs; also called earth-leakage
circuit breakers or ELCBs). Universal current sensitive RCCBs
according to EN 50178 and IEC 755.
The frequency inverter has a built-in mains rectifier. When a frame
fault occurs, a DC fault current can block the trip of the alternating
current sensitive or pulse current sensitive residual-current circuit
breaker, thereby preventing its protective function. We therefore
recommend the use of:
• Universal RCCBs with a rated fault current
f
300 mA.
The approximate fault current values of the DV6 frequency inver-
ters and their assigned radio interference filters are listed in the
appendix, Section “Radio interference filters“, Page 197.
Spurious tripping of a residual-current circuit breaker can be
caused by the following:
• capacitive compensation currents in the cable screens, particu-
larly with long, screened motor cables,
• simultaneous connection of multiple frequency inverters to the
mains supply,
• the use of additional chokes and filters (radio interference
filters, line filters).
Mains contactor
The mains contactor is connected to the mains side input cables
L1, L2, L3 and allows the DV6 frequency inverter on the supplying
network to be switched on and off during operation and to be
disconnected in the event of a fault.
Mains contactors and their assignment to the DV6 frequency
inverters are listed in the appendix, Section “Mains contactors“,
Page 195.
Current peaks
In the following cases, a relatively high peak current can occur on
the primary side of the frequency inverter (i.e. on the supply
voltage side), which, under certain conditions, can destroy the
input rectifier of the frequency inverter:
• Imbalance of the voltage supply greater than 3 %.
• The maximum power output of the point of supply must be at
least 10 times greater than the maximum frequency inverter
rating.
• If sudden voltage dips in the supply voltage are to be expected,
e.g. :
– a number of frequency inverters are operated on a common
supply voltage
– a thyristor system and a frequency inverter are operated on a
common supply voltage
– power factor correction devices are switched on or off
In these cases, a mains choke with about 3 % voltage drop at
rated operation should be installed.
Identification on the residual-current circuit-breakers
Logo
Mode
l
Alternating
current sensitive
(RCCB, Type AC)
Pulse current
sensitive
(RCCB, Type A)
Universal current
sensitive
(RCCB, Type B)
Caution!
Residual-current circuit breakers must be installed only on
the primary side between the incoming supply and the
frequency inverter.
Warning!
To prevent the risk of fire, use only cables, residual-
current circuit breakers and contactors with the specified
rating.
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