9
05.01
9.7 Circuit examples =1 to =10 with SIMODRIVE 611 analog
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Siemens AG 2001 All rights reserved
SIMODRIVE 611 Planning Guide (PJU) – 05.01 Edition
Start inhibit monitoring
The start inhibit monitoring, terminals 37–38 acts in the EMERGENCY STOP
circuit in front of contactor –K21. Under standard operating conditions, when the
drives stop, the NC contact AS1–AS2 of the drive inhibit relay in the drive modu-
les must first be closed before the NO contacts of contactors –K33 and –K36
open. To realize this, the coils of these contactors must be provided with a diode
to extend the contactor drop–out delay. If the start inhibit is erroneous, the moni-
toring circuit opens, the EMERGENCY STOP contactor –K21 drops out and
powers down the complete drive group via the line contactor. The start inhibits
are cyclically and actively monitored after each stopping operation.
Drives off
S The drives are braked to a standstill as fast as possible along the current
limit via pushbutton EMERGENCY STOP –S24 or Off –S22. The function is
similar to circuit =2. After the spindle drive braking time has expired, the
drive group is shut down via contactors –K31/–K32, i.e. the line contactor
drops out and the start inhibit functions become active.
Holding brake
The control is similar to circuit =2
Temperature monitoring
The function similar to circuit =2.
The temperature monitoring of the spindle drive must additionally evaluated via
PLC–E13 and –E14.
Circuit example =5 “Drives, automatic/setting–up
operating mode with enable”
Application
For most machines/plants, the operating mode changeover is used, in order,
e.g. to be able to traverse drives with a monitored, reduced speed in the setting
up machine mode. In this operating mode, other sub–areas must be shut down
in a safety–related fashion due to potential hazards. The operator must enable
drive operation in the setting up mode with reduced speed. This enable signal
can come, e.g. depending on the risk assessment, from a secure location out-
side the machine hazardous zone or from a handheld terminal with additional
EMERGENCY STOP pushbutton in the machine working zone.
Notice
The user must carefully observe special technological and machine–specific
regulations and standards to remain in compliance with personnel and machi-
nery protection legislation. Furthermore, the residual risks must be evaluated,
e.g. as a result of vertical axes.
9 Important Circuit Information
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