KEPCO JQE 150-1.5MVPY-26956 Half Rack - Manual (Page 23)

JQE SPECIAL SVC 081111
2-5/(2-6 Blank)
increase of the output voltage up to E
O
nominal. Verify that when the VOLTAGE control is
fully clockwise, the DVM voltage reads E
O
nominal (±0.1% E
O
nominal).
6. Check the "crowbar" action of the overvoltage protection by adjusting the output voltage to
E
O
nominal using the front panel VOLTAGE control. Through the access hole in the top
cover, slowly adjust the OVP ADJ pot counterclockwise until the input circuit breaker trips.
Turn the OVP ADJ pot 1/4 turn clockwise. Turn AC POWER circuit breaker "on" and verify
that the unit stays on.
7. Turn AC POWER circuit breaker "off." Place a precison 4-terminal shunt across the output.
Connect the DVM to the shunt’s sensing terminals (DVM return to the sensing terminal of the
shunt that is connected to –V power terminal at TB501). Turn CURRENT LIMIT CONTROL
"A" fully clockwise and CURRENT LIMIT CONTROL "B" fully counterclockwise.
8. Turn AC POWER circuit breaker "on." Slowly turn front panel CURRENT LIMIT CONTROL
"B" clockwise and observe the gradual increase in output current at the front pannel amme-
ter. Check that at the full clockwise position of the CURRENT LIMIT CONTROL "B" the DVM
reads 1.05 x I
O
nominal "B" value (± 0.5% I
O
nominal "B" value).
NOTE: Use the following formula to obtain output current I
O
from the DVM voltage readings:
2.6 INSTALLATION (REFER TO FIGURE 1-1, OUTLINE DRAWING)
The JQE specials may be used as a bench-operated instrument. A retractable "bail" is provided
to lift the power supply front to a convenient viewing and operating angle. If the supply is to be
rack-mounted, the bail, the two rear feet and the side handles must be removed.
For all installations into confined spaces, care must be taken that the temperature immediately
surrounding the unit does not exceed the maximum specified ambient temperature (71°C).
2.7 GROUNDING
AC GROUND. The power supply is equipped with a 3-wire safety line cord and polarized plug.
The third (green) wire in the line cord is connected to the chassis and the case of the unit.
WARNING
For safe operation It is recommended that the rear panel stud marked be
connected to the appropriate earth ground.
DC GROUND. The DC output is isolated from the AC power line and from any direct connection
to chassis or ground. The maximum voltage that can be supported between either output termi-
nal and ground or chassis is 500V DC plus the maximum output voltage of the power supply.
Either side of the output may be grounded. A convenient grounding terminal is provided at the
rear terminal block TB501 GND terminal.
IO (Amperes)
VDVM (Volts)
RSHUNT (Ohms)
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