ST Series Power Supply Instruction Manual TROUBLESHOOTING
telemark.com 55 of 64 Rev 1.0.0
7 TROUBLESHOOTING
7.1 BASIC TROUBLESHOOTING
Whenever the ST Power Supply enters a latched fault condition, one of the several fault
condition LEDs on the front panel of the HVPS, as well as the red Fault LED on the ST
Controller, will light up.
High Voltage operation will be shut off and the red Fault LED will remain active until the
fault is cleared.
The fault condition can normally be cleared by pressing the HV OFF pushbutton on the
ST Controller if the condition for the fault is no longer present. Otherwise, the unit will
re-enter the fault condition and the fault LED will remain active.
7.1.1 HV Overvoltage Fault
This is a “Latched Fault” and will shut down HV operation.
An HV Overvoltage Fault will occur when the HVPS detects the HV output voltage has
exceeded 5% above the maximum factory calibration setpoint for the Power Supply.
Possible causes for this fault include:
Emitter assembly malfunction inside the vacuum chamber resulting in a heavy
arc condition or emitter short.
Component failure inside the HVPS resulting in loss of calibration.
7.1.2 HV Overcurrent Fault
This is a “Latched Fault” and will shut down HV operation.
An HV Overcurrent Fault will occur when the HVPS detects the HV output emission
current has exceeded 5% above the maximum factory calibration setpoint for the Power
Supply.
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