Digitax HD M75X Series Installation and Technical Guide
47
Issue Number: 5
4 Electrical installation
Electric shock risk
The voltages present in the following locations can cause severe electric shock and may be lethal:
•
AC supply cables and connections
•
DC and brake cables, and connections
•
Output cables and connections
•
Many internal parts of the drive, and external option units
Isolation device
The AC and/or DC power supply must be disconnected from the drive using an approved isolation device before any cover is removed
from the drive or before any servicing work is performed.
STOP function
The STOP function does not remove dangerous voltages from the drive, the motor or any external option units.
Safe Torque Off function
The Safe Torque Off function does not remove dangerous voltages from the drive, the motor or any external option units.
Stored charge
The drive contains capacitors that remain charged to a potentially lethal voltage after the AC and/or DC power supply has been
disconnected. If the drive has been energized, the AC and/or DC power supply must be isolated at least ten minutes before work may
continue. Normally, the capacitors are discharged by an internal resistor. Under certain, unusual fault conditions, it is possible that the
capacitors may fail to discharge, or be prevented from being discharged by a voltage applied to the output terminals.
Equipment supplied by plug and socket
Special attention must be given if the drive is installed in equipment which is connected to the AC supply by a plug and socket. The AC
supply terminals of the drive are connected to the internal capacitors through rectifier diodes which are not intended to give safety isolation.
If the plug terminals can be touched when the plug is disconnected from the socket, a means of automatically isolating the plug from the
drive must be used (e.g. a latching relay).
Permanent magnet motors
Permanent magnet motors generate electrical power if they are rotated, even when the supply to the drive is disconnected. If that happens
then the drive will become energized through its motor terminals. If the motor load is capable of rotating the motor when the supply is
disconnected, then the motor must be isolated from the drive before gaining access to any live parts.
0V control connections on all frame sizes are internally earthed and cannot be disconnected. Ensure that there is adequate equipotential
bonding between parts of a system with interconnected control wiring.
WARNING
WARNING
WARNING
WARNING
WARNING
WARNING
WARNING
WARNING
Summary of Contents for Digitax HD M75 Series
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