Low Voltage / Plc Shutdown - LNS QUICK LOAD SERVO S3 Troubleshooting And Spare Parts Manual

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Low Voltage / PLC Shutdown

Description:
The Quick Load Servo S3 uses a LNS PCD2 controller (PLC) to send/receive inputs/outputs. The PLC is powered by a +24VDC input
supplied by a transformer. The input supply voltage must be regulated to ensure proper functioning. The remote control station,
which is used to send/receive data back and forth with the PLC, is powered by the +24VDC on the PLC.
Through the remote control station, the user can command the bar feeder to perform different functions by sending data to the PLC.
The PLC will then transfer data back to the remote control station to either inform the user the status of what the bar feeder is doing or
is waiting for the user to command the next task.
The following chart discusses possible problems, which may be occurring between the PLC and the remote control station:
Problem
SPS No response
No operator action possible on
the remote control station
QUICK LOAD SERVO S3
Possible Cause/s
• The PLC toggle switch is not
in the RUN position
• A sudden drop in the supply
voltage has caused a
communication problem
between the PLC and the
remote control station
• The battery was either
removed or battery voltage
was low while the bar feed
was powered down which
caused the PLC to lose its
program
• The PLC toggle switch is not
in the RUN position
• Low supply voltage on the
PLC
Chapter 2: Common Issues
Solution/s
• Flip the toggle switch on the
PLC to the RUN position
• Check the supply voltage on
the PLC, can be low due to a
low incoming 3 phase
voltage from the lathe
• Check the battery voltage, if
it is low it will need to be
replaced with a 3VDC
Lithium/CD2032 battery and
the program will need to be
restored (refer to)
• Flip the toggle switch on the
PLC to the RUN position
• Check the supply voltage on
the PLC, can be low due to a
low incoming 3 phase
voltage from the lathe