Installation, Wiring,
and Specifications
2–3
Installation, Wiring, and Specifications
The first level of fault detection is ideally
the PLC control program, which can
identify machine problems. You must
analyze your application and identify any
shutdown sequences that must be
performed. These types of problems are
usually things such as jammed parts, etc.
that do not pose a risk of personal injury
or equipment damage.
WARNING: The control program must
not be the only form of protection for any
problems that may result in a risk of
personal injury or equipment damage.
Turn off
Saw
Jam
Detect
RST
RST
Retract
Arm
You should also use electromechanical devices, such as master control relays
and/or limit switches, to prevent accidental equipment startup at an unexpected
time. These devices should be installed in such a manner to prevent any machine
operations from occurring.
For example, if the machine has a jammed part the PLC control program can turn off
the saw blade and retract the arbor. However, since the operator must open the
guard to remove the part, you should also include a bypass switch that disconnects
all system power any time the guard is opened.
The machinery must provide a quick manual method of disconnecting all system
power. The disconnect device or switch must be clearly labeled “Emergency Stop”.
To disconnect PLC
output circuitry
Saw
Arbor
E STOP
Master
Relay
Master Relay Contacts
To disconnect
PLC Power
Emergency
Stop
Power On
Master Relay Contacts
Use EĆStop and Master Relay
Guard
Limit
Guard Limit Switch
After an Emergency shutdown or any other type of power interruption, there may be
requirements that must be met before the PLC control program can be restarted. For
example, there may be specific register values that must be established (or
maintained from the state prior to the shutdown) before operations can resume. In
this case, you may want to use retentive memory locations, or include constants in
the control program to ensure a known starting point.
Orderly System
Shutdown
System Power
Disconnect
Emergency Stop
Содержание DL05
Страница 1: ...DL05 User Manual Automationdirect com ...
Страница 2: ...DL05 User Manual Automationdirect com ...
Страница 436: ...1B DL05 Error Codes In This Appendix Ċ Error Code Table ...
Страница 443: ...1C Instruction Execution Times In This Appendix Ċ Introduction Ċ Instruction Execution Times ...
Страница 459: ...1D Special Relays In This Appendix Ċ DL05 PLC Special Relays ...
Страница 464: ...1E DL05 Product Weights In This Appendix Ċ Product Weight Table ...
Страница 466: ...1F European Union Directives CE In This Appendix Ċ European Union EU Directives Ċ Basic EMC Installation Guidelines ...