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absolute measurements, or relative measurements read directly as the line or load is
varied. In the same manner, an oscilloscope return can be biased for accurate peak
measurements during pulsing.
5.5 DETERMINING AC LINE CURRENT
I
=
L
√3
EX: An LC1202 operating from 208V - 10% and delivering 12000W average.
I
When charging very large capacitor banks requiring many seconds or minutes to reach
end-of-charge, the power supply will display a load fault and go into a 50% duty cycle
protection mode. If this feature is defeated and the power supply is allowed to charge for
an extended period, then the peak output power rather than the average must be used
to determine line current.
5.6 OPERATION AS A DC POWER SUPPLY
The LC1202 can provide a regulated voltage to a DC load such as an electron beam.
The output current will be preset at the factory in order to limit the average output power
to 12000W, while making full rated HV steady state. The voltage ripple can be easily fil-
tered to any desired level with an external capacitor across the load.
For more details refer to App Note 505 available from TDK-Lambda web site
(http://us.tdk-lambda.com/hp/).
5.7 OPERATION WITH REMOTE VOLTAGE SENSE
Only factory configured LC1202 power supplies with the "RS" option will operate with an
external voltage sense. The Remote Voltage Sense is connected to the LC1202 supply
via the "REM FEED BACK" BNC connector on the rear panel (Figure 8). The signal
must be a linear scaled voltage signal provided by the system with a range of 0 to 200
VDC equal to 0-100% of the supplies' rated voltage. The input impedance characteristic
of the REM FEED BACK connection is 1M Ohm at 750pf.
83494001 Rev H
P
I
= Line current
L
P = Average output power
V
P
L
F
V
= Line voltage
L
P
= Power factor (0.9 min)
F
= Efficiency (0.9min)
12000
=
L
√3
(.9x208)(0.9)(0.9)
= 45.7A
Page 19 of 27
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