Siemens 6SN1123-1AA00-0DA2 Configuration Manual page 286

02.03 02.03
05.01
Drives, off
Using pushbutton –S24 EMERGENCY STOP or –S22 Off, the drives, assuming
that they have still not been stopped via the NC program, are braked and
stopped as quickly as possible at the selected current limit of the drive modules.
Terminal 64, drive enable, is inhibited and braking is initiated using the instanta-
neous contact of contactor –K22. After braking has been completed, the line
contactor is opened using a safely overlapping shutdown time via the off delay
contact of –K23 in a safety–relevant way through two channels via terminal 48
and NS1–NS2 of the line contactor; the drive inhibit functions are activated by
inhibiting terminals 663. Fault signals of the drive system, interlocked using the
PLC logic can be used, depending on the application, to brake along the current
limit or for controlled braking along a setpoint ramp. The Off button also acts on
PLC I22. This means PLC logic can be used to determine which switch–off
command caused the drive group to be shutdown. The drive group can also be
powered down via the PLC, logically combined, independent of the ready signal
of the NE module using contactor –K25.
Holding brake
The holding brake is controlled, coordinated as far as the timing is concerned by
the PLC logic through PLC O27. When the drives are stopped, the brake is ad-
ditionally safely shutdown per hardware using an off delay contact of contactor
–K23. This means that a PLC fault, when the drive is stationary, cannot cause
the brake to be incorrectly controlled.
Temperature sensor
If the temperature monitoring is tripped because of overtemperature of a drive
module and/or a motor, the 5.1–5.3 relay contact on the NE module activates
the PLC–E12 input. Using the logical interlocking in the PLC, the drives must,
depending on the application, be shutdown either instantaneously or delayed,
e.g. using PLC O25 and contactor –K25.
Circuit example =3 "Drives start/stop/safe standstill"
Application
This control is used where one or several drives must be selectively shut down
from an operational drive group using safety–relevant technology. The drive can
be shutdown in a safety–relevant way from the drive group using a two–channel
key–operated switch or, e.g. using light barriers or limit switches. Beforehand,
the drive must have been safely stopped by the NC control. The "safe standstill"
condition is achieved using the start inhibit function.
Functions
Drives, start
The 2–channel stop circuit in front of safety relay –K11 must be closed using the
key–operated switch –S11 and the EMERGENCY STOP circuit contactor
=2–K22. Contactor –K11 is closed with "monitored start" and latches using but-
ton –S12 – start – and the closed feedback circuit. Terminal 65, controller
enable, and terminal 663, pulse enable, are energized.
The drive is moved and stopped in a controlled way using the NC program.
© Siemens AG 2012 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
8 Important Circuit Information
8.7 Circuit examples =1 to =9 with SIMODRIVE 611
8
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