NORD Drivesystems BU0540 - Manual (Page 10)

SK 500E – Brief instructions for frequency inverters
10 BU 0540 GB-1013
1.1.2 List of Safety and installation information
DANGER Danger of electric shock
The frequency inverter operates with a dangerous voltage. Touching certain conducting components (connection
terminals, contact rails and supply cables as well as the PCBs) will cause electric shock with possibly fatal
consequences.
Even when the motor is at a standstill (e.g. caused by an electronic block, blocked drive or output terminal short-
circuit), the line connection terminals, motor terminals and braking resistor terminals, contact rails, PCBs and
supply cables may still conduct hazardous voltages. A motor standstill is not identical to electrical isolation from
the mains.
Only carry out installations and work if the device is disconnected from the voltage and wait at least 5
minutes after the mains have been switched off! (The equipment may continue to carry hazardous voltages for
up to 5 minutes after being switched off at the mains).
Follow the 5 Safety Rules (1. Switch off the power, 2. Secure against switching on, 3, Check for no voltage, 4.
Earth and short circuit, 5. Cover or fence off neighbouring live components).
DANGER Danger of electric shock
Even if the drive unit has been disconnected from the mains, a connected motor may rotate and possible
generate a dangerous voltage. Touching electrically conducting components may then cause an electric shock
with possible fatal consequences.
Therefore prevent connected motors from rotating.
WARNING Danger of electric shock
The voltage supply of the frequency inverter may directly or indirectly put it into operation, or touching electrically
conducting components may then cause an electric shock with possible fatal consequences.
Therefore, all poles of the voltage supply must be disconnected. For devices with a 3-phase supply,
L1 / L2 / L3 must be disconnected. For devices with a single phase supply, L1 / N must be disconnected. For
devices with a DC supply, –DC / +B must be disconnected. Also, the motor cables U / V / W must be
disconnected.
WARNING Danger of electric shock
In case of a fault, insufficient earthing may cause an electric shock with possibly fatal consequences if the device
is touched.
Because of this, the frequency inverter is only intended for permanent connection and may not be operated
without effective earthing connections which comply with local regulations for large leakage currents (> 3.5mA).
EN 50178 / VDE 0160 stipulates the installation of a second earthing conductor or an earthing conductor with a
cross-section of at least 10mm
2
.
WARNING Danger of injury if motor starts
With certain setting conditions, the frequency inverter or the motor which is connected to it may start automatically
when the mains are switched on. The machinery which it drives (press / chain hoist / roller / fan etc.) may then
make an unexpected movement. This may cause various injuries, including to third parties.
Before switching on the mains, secure the danger area by warning and removing all persons from the danger
area.