TDK-Lambda 203, Operator'S Manual, Page: 37 / 60

CONTROLS, INDICATORS, CONNECTORS
83489011 Rev A
6-13
6. OPTIONAL FEATURES
The 203/303 series power supplies can be ordered with a number of optional features
which are explained in the following paragraphs.
6.1 LOW ENABLE OPTION (-EN)
All model 203/303 power supplies are equipped with an Enable or HV ON/OFF signal as
part of the remote interface. The standard ENABLE logic is a 12-15V signal turns HV
ON and 0V or open turns HV OFF. The EN option replaces the standard logic levels with
12-15V = HV OFF and 0V or Open = HV ON.
6.2 5V PROGRAMMING OPTION (-5V)
All model 203/303 power supplies are equipped with an Analog output voltage program
signal (V
program
) as part of the remote interface. The program level is 0-10V input is equal
to 0 to 100% of rated output voltage. The -5V option replaces the standard programming
so that 0-5V input delivers 0-100% of rated voltage at the output.
6.3 LATCHING OVERLOAD PROTECTION OPTION (-LP)
Standard model 203 and 303 series capacitor charging supplies are equipped with a
Load Fault or Overload protection circuit. This circuit causes the power supply to shut
down and indicate a LOAD FAULT condition if the output voltage does not reach the
programmed voltage within 500ms. The LOAD FAULT condition automatically clears af-
ter a further 500ms, and the supply continues charging the load in 500ms intervals until
the programmed voltage is reached.
If the LP option is installed, the power supply still shuts down if the output voltage does
not reach the programmed voltage within 500ms, and the unit stays latched OFF indicat-
ing a LOAD FAULT, which requires a reset signal before it will restart.
6.4 CONTINUOUS DC OPTION (-DC)
Model 203 or 303 power supplies equipped with the DC option should not be op-
erated in parallel without first contacting the factory.
The DC option is specified when a 203 or 303 series power supply is used to power a
continuous DC load such as an RF tube, amplifier, DC-DC converter, or similar load
where the output voltage and current is continuously on.
All model 203 and 303 power supplies equipped with the DC option have –DC in the
product description, for example – 303L-50KV-POS-DC, 203L-7KV-POS-DC-400VAC.
203 and 303 -DC supplies are factory modified to have the OVERLOAD function defeat-
ed, the output current adjusted for the appropriate power level (see power ratings in
Section 2.1), and a different final test procedure is employed.
When operating a model 203 or 303 power supply in a DC application, the customer
must add an external filter capacitor to the load circuit to ensure the output ripple is suit-
able for the application. Model 203 and 303-DC power supplies must never be operated
into a resistive or other load without an external filter capacitor, otherwise damage may
occur to the High Voltage Output. For more details on continuous DC operation and filter
capacitor sizing and selection, please refer to our online App Note 505 which can be
downloaded at;
http://www.us.tdk-lambda.com/hp/pdfs/application%20notes/93008505rC.pdf