7 General
Page
28
Installation manual PMCprimo Drive2
7.14 Option
-AS
7.14.1 General
A frequently required application task is the protection of personnel against the restarting of drives.
This can not be achieved by an electronic inhibit, but must be implemented with mechanical
elements (positively driven relay contacts).
To get round this problem, up to now either the main contactor in the mains supply line was
switched off, or another contactor was used to disconnect the motor from the PMCprimo Drive2.
The disadvantages of this method are:
•
the DC-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 -AS- option avoids these disadvantages. A safety relay in the servo amplifier is activated either
by the PLC or manually. Positively driven contacts provide a safe disconnection of the PMCprimo
Drive2, the setpoint input of the PMCprimo Drive2 is inhibited, and a signal is sent to the safety.
The advantages of the Option -AS-:
•
the DC-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
7.14.2 Prescribed
use
The -AS- restart lock is
exclusively
intended to provide safety for personnel, by preventing the
restart of a system.
To achieve this personnel safety, the wiring of the safety circuits must meet the safety requirements
of EN60204, EN292 and VDI 2853.
The -AS- restart lock must
only
be activated,
•
when the motor is no longer rotating (speed = 0 rpm).
Drives with a suspended load must have an additional safe mechanical blocking (e.g. by a
motor-holding brake).
•
when the monitoring contacts (KSO1/2 and BTB/RTO) for all PMCprimo Drives are wired into
the control signal loop (to recognize a cable break).
The -AS- restart lock may
only
be controlled by a CNC if the control of the internal safety relay is
arranged for redundant monitoring
The -AS- restart lock must
not
be used if the drive is to be made inactive for the following reasons:
1.
- cleaning, maintenance and repair operations
- long inoperative periods
In such cases, the entire system should be disconnected from the supply by the personnel,
and secured (main switch).)
2. -
emergency-stop situations
In an emergency-stop situation, the main contactor is switched off (by the emergency-stop
button or the BTB-contact in the safety circuit).)
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