SAFETY vacon • 7
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
1
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 grounding and earth fault protection
The VACON
®
NX AC drive must always be earthed with an grounding conductor connected to the PE
bar in the lower front side of the cabinet.
The earth fault protection inside the AC drive 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 AC drive, fault current protective switches
may not function properly.
The components of the power unit of the AC drive 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 AC drive 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 AC drive to mains make sure that the VACON
®
NX front and
cable covers as well as the cabinet doors are closed.
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