Skov DOL 38, Техническое руководство пользователя

Страница: 9 / 36

DOL 38 Frequency Converter
Technical User Guide 9
4 Installation guide
4.1 Electrical connection
Wait 10 minutes for the capacitors to discharge to a safe voltage level before servicing and trou-
bleshooting.
Failure to observe this precaution could result in serious injury or loss of life.
Installation, servicing and troubleshooting of all electrical equipment must be carried out by quali-
fied personnel in compliance with the applicable national and international standard EN 60204-1
and any other EU standards that are applicable in Europe.
The installation of a power supply isolator is required for each motor and power supply to facilitate
voltage-free work on the electrical equipment. The power supply isolator is not included.
4.1.1 Disclaimer at retrofitting fans
In the case of retrofitting fans in an existing house, regardless of ON/OFF fans, LPC fans or frequency convert-
ers SKOV recommends that a local expert is involved in checking the electrical installations. The focus should
be on cable dimensions, overload protections, local transformers, etc. It is of outmost importance to take the fan
specifications into account and, at the same time, ensure that local requirements are fulfilled.
4.1.2 Mains supply dimensioning regarding harmonic distortion
LPC motor controllers and frequency converters function like any other electronic power converter by converting
AC to DC. As this conversion produces a non-sinusoidal current, the mains supply for the controller is affected
by harmonic distortion.
The electrician or the user of the equipment must ensure, possibly through contact with the supply company,
that the equipment is connected to a properly sized mains supply.
4.1.3 Overvoltage protection
SKOV A/S equipment are protected for high level of surge transient, but in some cases, specially in areas with
frequent lightning strikes and power outage, additional protection is necessary. To reduce the risk of damaging
the electronic equipment by large surge overvoltage, it is therefore recommended, always to install Surge Pro-
tection Devices (SPD) in the mains supply.
As a minimum a Type 2/Class II device should be installed in each livestock house wiring box. A device of
8/20us - 40kA/phase or higher is recommended.
In areas with a high amount of surge overvoltage a Type 1/Class I device is reccomended to be installed at the
transformer/ATS as the first protection device, together with Type 2 in each livestock house wiring box as sec-
ond protection device. A Type 1 device of 10/350us - 25kA/phase or higher is are recommended.
Local electrical engineers must be consulted for correct dimensioning and installation of the SPD device.
Figure 1: Example of installation of SPD