SKC3400220 Emerson

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).

1.11.1 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 bus, dynamic brake cables and 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.

1.11.2 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.

1.11.3 STOP function

The STOP function does not remove dangerous voltages from the drive, the motor or 

any external option units.

1.11.4 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 Control Techniques or their authorized 

distributor.

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