TDK-Lambda 203, Operator'S Manual, Page: 22 / 60

INSTALLATION
83489011 Rev A
4-16
AC INPUT
VOLTAGE
MODE
RECCOMENDED AC INPUT CABLE SIZE
MODEL 203 MODEL 303
432-528 VAC,
50-60 Hz, 3

Cap Charging 5 AWG 4 AWG
Continuous DC 4 AWG 3 AWG
360-440 VAC,
50-60 Hz, 3

Cap Charging 5 AWG 4 AWG
Continuous DC 4 AWG 3 AWG
180-264 VAC,
50-60 Hz, 3

Cap Charging 3 AWG Not Available
Continuous DC 3 AWG Not Available
Table 4-1 Recommended AC Input Cable
The AC input rating is marked on the rear terminal of the power supply. The rating is al-
so part of the unit’s model description shown in Table 1-1.
4.6 CONNECTING THE HIGH VOLTAGE OUTPUT
Voltage reversal at the output of this power supply can potentially cause
damage to the high voltage section if reverse current is not limited. Refer to
Application Note 517 (available from the factory or at www.us.tdk-
lambda.com/hp) for more information.
Ensure that the power supply is off and disconnected
from the AC input power and that all load capacitors are
discharged and shorted to ground before making any
connections. Never handle the HV cable while the supply
is operating. Never operate the supply without a load
capacitor connected.
Always use the HV connector and cable provided with the power supply or an equivalent
substitute provided by TDK-Lambda Americas. Fully insert the connector end of the HV
cable and tighten the locking nut only "hand tight".
When operating above 20kV and 200Hz rep rate a silicone grease (such as Dow Corn-
ing DC-4) must be applied to the HV cable before insertion into the HV connector. The
grease is used to displace air in the connector and reduce long-term corona effects. A
cable greasing procedure is available for download from the TDK-Lambda Americas
web site.
The load ground must be connected to the chassis ground through a separate safety
ground cable with a suggested minimum wire size of 6 AWG in addition to the H.V. out-
put cable shield (see Figure 4-4).
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-