Safety Integrated - Industry - Siemens

Ex. No. Protective door monitoring with automatic start Category 2
3.3
acc. to EN 954-1 with ET200S Safety Motorstarter Solution Local
Function
Description of the functionality
This Safety Functional Example describes a mechanically isolating
protective mechanism in the form of a protective door.
The most frequently used solution for plants and machines to
secure hazardous areas is mechanically isolating protective
equipment or access hatches. In this case, the function is to
monitor unauthorized entry into plant and system areas as
well as to prevent potentially hazardous machine functions if
the protective equipment - in this case protective door - is not
closed.
The protective door is monitored by a SIRIUS position switch
with positively-opening contacts using a PM-D-F2 safety module
according to Category 2 in compliance with EN 954-1. If
this protective door is opened, the PM-D-F2 safety module
shuts down the motor starter assigned to it according to Stop
Category 0 acc. to EN 60204-1. In this particular example, a
drive is stopped. If the protective door is closed, after the position
switch is checked, the motor automatically starts.
This example only discusses the safety function. The motor
starter is operationally switched using a standard PLC and is
not considered any further here.
Advantages/customer benefits
■ Pure hardware engineering without having to configure/program
software for the safety-relevant technology
■ Extensive Profibus diagnostics of the motor starter and the
PM-D-F2 safety module.
■ As a result of the lower time/costs involved with materials
and wiring, the mounting space in the cabinet is reduced
and therefore the overall dimensions of the plants/system.
Contactor contacts welded signal
Using this circuit example, Category 2 according to EN 954-1
can only be fulfilled if, when the actuator fails, an alarm is automatically
output or the machine control initiates a safe condition.
If this is not the case, a second shutdown path is required.
This signal can be generated using the process image of the
motor starter.
58 Functional Example No. CD-FE-I-027-V10-EN
ET200S Standard ET200S HF
PAE 0.0 Ready 0.0 Ready (automatic)
0.1 Close contactor 0.1 Start motor (current
measurement)
0.2 Circuit-breaker 0.2 Group fault
tripped
0.3 Group alarm
0.4 Input 1
0.5 Input 2
0.6 Input 3
0.7 Input 4
1.0-1.5 Motor current Iact 1.6 Mode H-V-O
1.7 Ramp mode (only
DSS1e-x)
PAA 0.0 Motor clockwise 0.0 Motor clockwise
0.1 Motor counter-clockwise
0.2 Brake 0.2 Release brake
0.3 Trip reset
0.4 Emergency start
0.5 Self-test
Netzwork 1:Time delay of the protective door signal
Comments:
#Protective door
T1
& SE
Network 2:Feedback signal, contactor contacts welded, standard motor starter
Comments:
#Contactor_closed
T1
S5T#500MS
&
#Contactor_welded
&
Typical block: Signal, contactor contacts welded for motor starter
standard
Using the standard output "contactor welded" an indicator
light can be controlled. As a result of this signal, a second
shutdown path is no longer required.
Note
The position switches must be arranged so that they are
not damaged when they are approached and passed.
This is the reason that they may not be used as mechanical
endstop.
TW
G_FB_XX_069