9 Interfaces
Installation manual for PMC tendo DD5/PMCprimo Drive3 Page 85
9.20 Personnel safe restart lock -AS-
A frequently required application task is the protection of personnel against the restarting of
drives. This can be achieved by an electronic inhibit or with mechanical elements (positively
driven relay contacts).
When positively driven relay contacts where used, either the net contactor in the mains supply
circuit switched off or the motor was disconnected from the servo amplifier by an additional
contactor.
The disadvantages of this method are
:
• the DC bus link has to be charged up again at restart
• wear on the contacts of the contactors, caused by switching under load
• extensive wiring required, with additional switching components
The restart lock -AS- avoids these disadvantages.
The conceptual examination of the function "safe stop" (called restart lock AS in the following)
was accomplished by the BG-Institute for Occupational Safety and Health and the classification
in category 3 according to EN 954-1 was confirmed.
Advantages of the restart lock -AS- :
• the DC bus link remains charged up, since the mains supply line remains active
• only low voltages are switched, so there is no contact wear
• very little wiring is required
• the functionality and the personnel safety when using the circuit recommendations in this
documentation have been approved by the Trade Liability Association
9.20.1 Technical data and pinning
Input voltage
20V..30V
Input current
40mA – 75mA (Ieff)
Peak current
220mA (Is)
9.20.2 Environment
Since the servo amplifier meets enclosure IP20, you must select the environment ensuring a
safe operation of the servo amplifier. The environment must meet enclosure IP54 at least.
9.20.3 Wiring
If the wiring leads outside the demanded enclosure (IP54), the cables must be laid durably
(firmly), protected from outside damage (e.g. laying in a cable duct), in different sheathed
cables or protected individually by grounding connection.
If wiring remains within the demanded enclosure, then it has to meet the requirements of the
standard EN 60204-1, section 14-3.
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