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83-493-001 Rev. K
11
3.5 CONNECTING HIGH VOLTAGE OUTPUT
POTENTIAL LETHAL VOLTAGE
Ensure that the power supply is off and disconnected from the input power and never
operate the power supply without a load capacitor. Make sure that all load capacitors are
discharged and shorted to ground before making any connections. TDK-Lambda
Americas Inc. recommends the use of safety dump switches in high voltage discharge
circuits.
Never handle the HV cable during operation.
This power supply is designed to operate with a capacitive load. Operation of the power
supply without an external load capacitor may result in damage to internal circuitry.
Always use the HV connector and cable provided with the power supply or an equivalent
substitute provided by TDK-Lambda Americas Inc. Fully insert the connector end of the
HV cable and tighten the locking nut only “hand tight”.
NOTE: When operating above 20kV and/or 200 Hz rep. rate, ensure that silicone
grease (such as Dow Corning DC-4) is applied to the HV cable before insertion into the
HV connector. This displaces the air in the connector and reduces long term corona
effect.
Keep the minimum HV cable bend radius greater than 4 inches (101.6mm) to minimize
stress on the insulation. Keep the HV cable as distant as possible from the input power
and the input control signals.
Some peak current will flow out of the power supply during discharge and return through
the HV return and system chassis. This current comes from voltage reversal in under
damped systems and from normal discharge of filter and cable capacitance. The path for
this current should not parallel control signal returns since the resulting voltages could
interfere with normal system operation. The currents developed with voltage reversal at
high rep. rates, could damage the power supply. A resistor in series with the HV output
can be added to limit this current to an acceptable level. Refer to Section 5.2, Page 16
for more information.
The oil-filled HV assembly should not be opened. The oil and components have been
specially cleaned and vacuum impregnated at the factory and the assembly hermetically
sealed. Opening the assembly will compromise performance and void the warranty.
Tanks must only be serviced at TDK-Lambda Americas Inc.