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Unidrive M Regen Design Guide 105
Issue Number: 4
6 Electrical Installation
Many cable management features have been incorporated into the product and accessories, this chapter shows how to optimize them. Key features
include:
• Internal EMC filter (MUST BE REMOVED)
• EMC compliance with shielding / grounding accessories
• Product rating, fusing and cabling information
STOP function
The STOP function does not remove dangerous voltages from the drive, the motor or any external option units.
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 connections
• Output cables and connections
• Many internal parts of the drive, and external option units
Unless otherwise indicated, control terminals are single insulated and must not be touched.
Isolation device
The AC 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.
Stored charge
The drive contains capacitors that remain charged to a potentially lethal voltage after the AC supply has been disconnected. If the drive
has been energized, the AC 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. If the drive has failed in a manner
that causes the display to go blank immediately, it is possible the capacitors will not be discharged. In this case, consult the supplier of the
drive or their authorised distributor.
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.
Safe Torque Off function
The Safe Torque Off function does not remove dangerous voltages from the drive, the motor or any external option units.
Fusing as specified must be provided.
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