KEPCO JQE 150-1.5MVPY-26956 Half Rack - Manual (Page 31)

JQE SPECIAL SVC 081111 3-7
Since E
r
/R
r
=I
b
(2), it follows that E
O
= I
b
R
VC
(3).
Referring to Equation (3), since I
b
is 1mA (precisely adjusted as shown in PAR. 4.5.5), for every
Volt of output, 1000 Ohms control resistance must be provided.
1. Determine value of programming resistor(s) for output voltage desired.
2. Using two-wire, shielded cable, connect the chosen resistors to terminals RPV1 and
RPV2 at terminal block TB501 on the rear panel. Connect the shield to the GND termi-
nal of TB501.
3. The output voltage (Volts) will be 1mA x R
VC
, (where R
VC
is in KOhms).
FIGURE 3-5. REMOTE RESISTANCE PROGRAMMING (VOLTAGE MODE)
3.7 CONSTANT CURRENT OPERATION
JQE special power supplies will deliver constant current depending on the output voltage and
output current limit settings as well as the load value. In constant current operating mode, the
voltage comparison bridge is interconnected with the internal current sensing resistor, R
S
, and a
current control, R
CC
(as shown in Figure 3-6) to maintain a constant voltage drop across R
S
. In
this way, an adjustable constant load current is obtained. Characteristic of the constant current
supply is ability to change its output voltage automatically in order to maintain a constant current
through a range of possible load resistances. The range of output voltage that the supply can