ST Series Power Supply Instruction Manual TROUBLESHOOTING
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An Arc Counter Fault will occur when there are too many continuous arcing events
detected within a specified amount of time as set by the factory.
Possible causes for this fault include:
Process arcing inside the chamber.
Intermittent shorting of HV to Ground.
7.1.5 Rail Current Fault
This is a “Latched Fault” and will shut down HV operation.
A Rail Current Fault will occur when the ST Power Supply detects too much current
passing through the DC Rails (and/or the Neutral line in 400V models) and onto the HV
power switches.
Possible causes for this fault include:
Input voltage to the ST Power Supply is too low during power on or has become
low during operation.
Emitter shorted to Ground.
Damaged or degraded components on the Inverter PCB regulating the
production of HV.
7.1.6 Step Start Fault
This is a “Latched Fault” and will shut down HV operation.
The Step Start Fault will occur when the DC Rail cannot be charged when attempting to
turn on High Voltage.
Possible causes for this fault include:
Blown input fuse on the Inverter PCB.
Damaged or degraded DC Rail capacitors.
DC Rails shorted (or shorted to Neutral, 400V models only)
Component failure in the Step Start charging circuit.
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