Hypertherm HyPrecision 100D, Instruction Manual

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5.4 System Fault Detection
HyPrecision 100D/150D pumps have a series of fault conditions that are constantly monitored by the
PLC. External stack lights or panel lights will blink to alert the operator that a fault has occurred.
If a fault condition is sensed by the control system, an alarm image will be displayed on the LCD
screen. Each fault condition is classified into one of three categories of severity:
WARNING ,
SHUTDOWN I , and SHUTDOWN II . The following is a list of conditions broken down by category.
For information on troubleshooting these conditions, please refer to the Maintenance and
Troubleshooting section of this manual.
•
Warning conditions: the yellow light blinking and an image will be displayed on the LCD screen.
•
Shutdown I conditions: the red light blinking and intensifier shutdown but the motor is still
running. An image will be displayed on the LCD screen.
•
Shutdown II conditions: the red light blinking and the motor and intensifier shutdown. An image
will be displayed on the LCD screen
Warning Messages
Warning messages are the least severe of the categories. The purpose of the warning is to alert the
operator of conditions that, if ignored, can result in a shutdown condition. The following conditions can
cause a warning to occur.
•
HYDRAULIC OIL TEMP > 130ºF (55ºC)
•
TOO MANY MOTOR STARTS PER HOUR
Hydraulic Oil Temp >130ºF (55ºC)
The probe in the hydraulic oil tank has two temperature switches to monitor conditions. One switch
opens at
130ºF (55ºC) and the other at 150ºF (65ºC). If the lower temperature is exceeded the yellow
light will begin to flash, warning the operator of a potential cooling water problem.
In systems that are cooled with water, the most likely cause of this condition is the cooling water is not
turned on or the inlet cooling water temperature is too high. The water-modulating valve may also be
out of adjustment. Review the
Low-Pressure Water section of this manual to troubleshoot the cooling
water. After correcting the problem, press RESET on the control panel alarm screen to turn off the
Warning light and reset the fault.
Systems equipped with air/oil coolers can trip the overload on the fan starter. If necessary, reset the
starter and set it to the
ON position. Fan cooled systems have a third temperature switch that is used to
determine when the oil has reached a temperature high enough to require cooling. A loose wire or failed
switch could also result in an over-temperature condition.
Too Many Motor Starts per Hour
The motor can be damaged if it is started too frequently. The threshold for this warning is set to six
times in 15 minutes. If this number is exceeded, the yellow light will blink and the message will be
displayed on the LCD screen. Reset the alarm by pressing
RESET on the control panel alarm screen.
Wait 15 minutes before starting the motor to allow time for the windings to cool.
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