TDK-Lambda 203, Operator'S Manual, Page: 39 / 60

OPERATING INSTRUCTIONS
83489011 Rev A
7-15
7. OPERATING INSTRUCTIONS
The 203/303 power supply is designed for operation in two modes. The first mode is lo-
cal, where the power supply is operated using the front panel controls. Local operation is
only possible with the L model supply. The second mode is remote, where control sig-
nals are passed via the 25pin remote connector. Remote operation is possible with all
203/303 model power supplies (L and S).
7.1 LOCAL OPERATION (203/303L only)
The model 203/303L has full front panel instrumentation and controls for use in labora-
tory, prototype or OEM systems. The front panel controls include power on/off, re-
mote/local keyswitch, HV on/off push-buttons, output voltage adjust, digital voltage and
current meters, and status indicators. An internal AC contactor is included which is con-
trolled by the front panel power switch and the interlock terminals on the rear of the unit.
A BNC connector is provided on the rear panel for easily connecting a pulsed INHIBIT
signal when operating from the front panel. The model 203/303L can be operated as a
"master" unit in parallel with several model 203/303S or "slave" units for increased out-
put power. Refer to Section 7.3 Parallel Operation.
After all external AC input, cooling, and load connections have been correctly made and
the high voltage cable properly terminated at the load, the power supply is ready to op-
erate.
NOTE : The 203/303 series power supplies are not designed to operate into an open cir-
cuit load. Operating the supply with no external load capacitor could result in damage to
the high voltage output section and would void the warranty.
CAUTION
HIGH VOLTAGES MAY POTENTIALLY EXIST FROM
THIS POINT FORWARD
To operate the supply, follow the steps below;
1. Turn "HV Level Adjust" control fully CCW.
2. Ensure key switch is in the OFF position.
3. Turn on AC power, "POWER" switch.
The fan should be running. The front panel LED's will light and reset. The INHIBIT
and HV OFF LEDs should be illuminated. The END OF CHARGE LED may or may
not be on at this time. The INTERLOCK OPEN LED should be extinguished.
4. Turn key switch to the LOCAL position. Push the HV ON button, slowly turn the high
voltage adjust level to the desired output voltage. Note that at any point in stopping
the adjustment, the end of charge light will illuminate.
5. When the desired output voltage is reached, the load switch should now operate and
the power supply will begin charging the load at the rated power level.
After the load has been discharged the AUTOINHIBIT function will inhibit the output cur-
rent for a short time before the load is re-charged. Alternatively an external inhibit signal
can be connected to the rear panel mounted BNC connector.