SAFETY
vacon • 5
24-hour s358 (0)201 212 575 • Email: [email protected]
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1.2
Safety instructions
NOTE!
If a fault protection relay is used , it must be of at least type B, preferably B+ ( according to
EN 50178) , with a trip level of 300 mA. This is for fire protection, not for touch protection in
grounded systems.
1.3
Earthing and earth fault protection
The Vacon NX frequency converter must always be earthed with an earthing conductor connected
to the PE bar in the lower front side of the cabinet.
The earth fault protection inside the frequency converter protects only the converter itself against
earth faults in the motor or the motor cable. It is not intended for personal safety.
NOTE!
Due to the high capacitive currents present in the frequency converter, fault current
protective switches may not function properly.
The components of the power unit of the frequency converter and all cabinet
mounted devices are potentially live when Vacon NX is connected to mains potential.
Coming into contact with this voltage is extremely dangerous and may cause death or
severe injury.
The motor terminals U, V, W and the DC-link/brake resistor terminals –/+ and all
other mains devices are potentially live when Vacon NX is connected to mains, even if
the motor is not running.
After disconnecting the frequency converter from the mains, wait until the fan stops
and the indicators on the keypad go out (if no keypad is attached see the indicators on
the cover). Wait 5 more minutes before doing any work on Vacon NX connections. Do
not even open the cabinet door before this time has expired.
The control I/O-terminals are isolated from the mains potential. However, the relay
outputs and other I/O-terminals may have a dangerous control voltage present even
when Vacon NX is disconnected from mains.
Before connecting the frequency converter to mains make sure that the Vacon NX
front and cable covers as well as the cabinet doors are closed.
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