NORD Drivesystems BU0700 - Manual (Page 6)

NORDAC SK 700E Operating Manual
6 Subject to technical alterations BU 0700 GB-1411
1.4 Safety and installation information
NORDAC SK 700E frequency inverters are equipment for use in industrial high voltage systems and are operated at voltages
that could lead to severe injuries or death if they are touched.

Installation and other work may only be carried out by qualified electricians and when the device is
disconnected. The manual must always be available for these persons and must be complied with.

Local regulations for the installation of electrical equipment as well as for accident prevention must be
complied with.

The equipment continues to carry hazardous voltages for up to 5 minutes after being switched off at the
mains. The equipment may only be opened or the cover or control element removed 5 minutes after the
equipment has been disconnected from the power supply. All covers must be put back in place before the line
voltage is switched back on again.

Even during motor standstill (e.g. caused by a release block, blocked drive or output terminal short circuit), the
line connection terminals, motor terminals and braking resistor terminals may still conduct hazardous voltages.
A motor standstill is not identical to galvanic isolation from the mains.

Attention, even parts of the control card and, in particular, the connection plug for the removable technology
units can conduct hazardous voltages. The control terminals are mains voltage free.

Warning, under certain settings the frequency inverter can start automatically after the mains are switched on.

The circuit boards contain highly-sensitive MOS semiconductor components that are particularly sensitive to
static electricity. Avoid touching circuit tracks and components with the hand or metallic objects. Only the
terminal strip screws may be touched with insulated screwdrivers when connecting the cables.

The frequency inverter is only intended for permanent connection and may not be operated without effective
earthing connections that comply with local regulations for large leak currents (> 3.5mA). VDE 0160 requires
the installation of a second earthing conductor or an earthing conductor cross-section of at least 10 mm
2
.

Normal FI-circuit breakers are not suitable as the sole protection in three-phase frequency inverters when
local regulations do not permit a possible DC proportion in the fault current. The standard FI circuit breaker
must comply with the new design as per VDE 0664.

The inverter must be mounted in a switch cabinet that is suitable for its immediate surroundings. In particular it
must be protected from excess humidity, corrosive gases and dirt.

In normal use, NORDAC SK 700E frequency inverters are maintenance free. The cooling surfaces must be
regularly cleaned with compressed air if the ambient air is dusty.
ATTENTION! DANGER TO LIFE!
The power unit can continue to carry voltages for up to 5 minutes after being switched off at the mains.
Inverter terminals, motor cables and motor terminals may carry voltage!
Touching open or free terminals, cables and equipment components can lead to severe injury or death!