AKD-C Installation | 7 Technical description and data
7.16 Shock-hazard Protection
7.16.1 Leakage current
Leakage current via the PE conductor results from the combination of equipment and cable
leakage currents. The leakage current frequency pattern includes a number of frequencies,
whereby the residual-current circuit breakers definitively evaluate the 50 Hz current. For this
reason, the leakage current cannot be measured using a conventional multimeter.
Since the leakage current to PE is more than 3.5 mA, in compliance with IEC61800-5-1 the
PE connection must either be doubled or a connecting cable with a cross-section >10 mm²
must be used. Deviating measures according to regional standards might be possible
7.16.2 Residual current protective device (RCD)
AKD-C with connected AKD-N can cause a d.c. current in the protective earthing conductor.
Where a residual current-operated protective (RCD) or monitoring (RCM) device is used for
protection in case of direct or indirect contact, only an RCD or RCM of Type B is allowed on
the supply side of AKD-C.
In conformity with IEC 60364-4-41 – Regulations for installation and IEC 60204 – Electrical
equipment of machinery, residual current protective devices (RCDs) can be used provided
the requisite regulations are complied with.
The AKD-C is a 3-phase system with a B6 bridge. Therefore, RCDs which are sensitive to all
currents must be used in order to detect any DC fault current.
Rated residual currents in the RCDs:
10 to 30 mA
Protection against "indirect contact" (personal fire protection) for stationary
and mobile equipment, as well as for "direct contact".
50 to 300 mA
Protection against "indirect contact" (personal fire protection) for stationary
equipment
If you use a selective RCD, the more intelligent evaluation process will prevent spurious trip-
ping of the RCD.
7.16.3 Isolating transformers
When protection against indirect contact is absolutely essential despite a higher leakage cur-
rent, or when an alternative form of shock-hazard protection is sought, the AKD can also be
operated via an isolating transformer (schematic connection (
# 61). A ground-leakage mon-
itor can be used to monitor for short circuits.
Keep the length of wiring between the transformer and the drive as short as possible.
7.17 LED Display
The LED seven-segment display indicates the status
of the drive after the 24 V supply is switched on. If the
service connection to the PC or to the PAC doesn't
work, then the LED display is the only way to get
information.AKD fault codes or warning codes are dis-
played constantly if present. Fault messages are
coded with "F" or "E", warnings are coded with "n".
The IP address can be flashed across the LED dis-
play if the B1 button is pressed.
The local fieldbus status LEDs are described in (
46
Kollmorgen | kdn.kollmorgen.com | February 2018
