3 - 42 Machine Maintenance 704-0212-209 VM Series Maintenance and Safety Manual
Common Problems
Common operator problems are listed below, with potential causes and solutions. These
problems are usually noticeable without the help of error messages, although error
messages may occur. More than one problem can result from a single cause.
Machine operation failures can be a programming or a hardware problem. Hardware
includes electronic components, wiring, and electro-mechanical devices.
Power-on Self Test
When you turn on the machine, the control performs a self test. If an error in the control
circuitry is detected, a pattern of beeps may sound instead of the normal start-up beep. A
screen error message may appear—follow any on-screen instructions.
Machine Voltages
Missing or faulty connections can cause a combination of problems, as listed below.
Table 3–19. Troubleshooting: Missing or Faulty Connections
Fluctuating voltages to the machine may occur when power usage in your region is high
(typically on a very hot or cold day). See the following table.
Table 3–20. Troubleshooting: Power Fluctuation
Connections Description
Missing • Open grounds
• Open neutrals
• Open phase connections
• Missing neutral-to-ground strap at main source
Improper • Phase and neutral reversed
• Phase and ground reversed
• Ground and neutral reversed
• Ground and neutral shorted at panel
Loose • At main panels
•At equipment
• At other equipment in system
• At service entrance
Causes Problems Solutions
Power sag
Fuse blows • Repair faulty in-plant wiring.
• Move any other machines on the circuit to
separate circuits.
Power is lost
Motor(s) overheat
Power spike
Microprocessor
and/or control PC
boards fail
• Move any nearby high current switching
devices (arc welders, inductive motors) away
from the machine.
• Properly ground equipment.
• Install surge protection to insulate against
lightning strikes.
Machine stops
and/or data is lost.
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