Computer Drive Installation Instructions

12 Functional Descriptions 04.96
12.20 Extended stop and retract (ESR) (SW 4 and higher)
– Application of internal sources:
- Emergency retraction threshold FA/FS,
- 611D DC link voltage threshold, drive MD 1634,
- 611D generator speed threshold, drive MD 1635
which must initiate a retraction operation.
– Definition of internal reactions to be initiated in the case of a retraction operation:
- Alarm and mode group stop
- Retraction operation as open-loop control function and/or as
- Autonomous drive function
• Drive parameters for the "Extended stop and retract" function (611D)
– DC link voltage threshold, drive MD 1631: If the voltage drops below this limit, a
drive defined as the generator axis switches to generator mode.
– Voltage step, drive MD 1632: This value defines the upper threshold of the two-
position controller for generator operation.
– DC link voltage threshold, drive MD 1633: If the voltage exceeds this limit value,
the drive switches from generator mode back to normal operation.
– DC link voltage threshold, drive MD 1634: If the voltage drops below this limit,
emergency retraction measures can be initiated according to user specifications
(via MD or programming).
– Generator speed threshold, drive MD 1635: If the speed drops below this value,
emergency retraction measures can be initiated according to user specifications
(via MD or programming).
2.) The possibility of controlling the function via the PLC:
• Channel-specific
– To PLC:
- ESR monitoring is active
- ESR reaction is initiated
• Axis/spindle-specific
– From PLC:
- Activate ESR monitoring
- Disable ESR monitoring
- Enable ESR reaction
– To PLC:
- ESR monitoring is active
- ESR reaction is initiated
- ESR reaction is programmed
- 611D ZK2 messages
• If monitoring is switched on from the PLC, it can be switched off from the PLC only.
• If monitoring is switched off from the PLC, it is switched off for all channels.
12–214
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SINUMERIK 840C (IA)