Archive – Ransburg 9040 Cascade LV Control Unit 76580 User Manual

Page 29

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CP-97-04.3

9040 Cascade Low Voltage Control Unit - Maintenance

Control Unit Output T

Control Unit Output Test

est

When a lack of high voltage at the applicator
indicates a problem, perform a Control Unit Output
Test on the control unit to determine whether it is
at fault.

Equipment Required: ITW Ransburg

Equipment Required: ITW Ransburg
L

LTST5000 L

TST5000 L

TST5000 LV Control Unit T

V Control Unit T

V Control Unit Test

est

Assembly

1. Turn control unit power OFF and remove low
voltage cable from control unit.

2. Connect tester cable to control unit.

3. Move switch on tester to FRONT PANEL kV
METER position.

4. Turn control unit ON and adjust control unit
high voltage adjust knob fully clockwise.

5. Read the control unit front panel kV meter.
Reading should be rated kV of applicator ±5 kV.
turn the control unit OFF.

If the voltage read correctly, the problem is not in
the control unit and the low voltage cable and
applicator should be checked for the cause. If
proper readings are not obtained, the problem is
with the control unit. Consult the “Troubleshooting
Flowchart” in this section to locate the specific
problem.

The LTST5000 Test Assembly can

also be used to test the low voltage cable.
Consult the LTST5000 service manual
for further information on using the
LTST5000 Test Assembly.

N O T E

PC Board T

PC Board Test Jumper

est Jumper

To assist in testing and troubleshooting, a jumper
(JP4) has been incorporated on the 9040 PC
board. By covering (shorting) both terminals the
high voltage on relay is triggered. Thus, for testing
and troubleshooting, high voltage output can be
obtained without the need to trigger the applicator
or user supplied control device. Just remember
to reposition the jumper after testing, so that it
covers only one terminal (open) or the high voltage
will stay on all the time. (See “Figure 4 - Main PC
Board” for location of test jumper JP4.)

Theory of Operation

Line voltage (90-264 VAC) is applied to input
terminals 8PL-1 and 8PL-2 of power supply 1 SUP
through the user supplied exhaust fan and
conveyor interlocks, fuse IFU, and ON/OFF
switch 1SW.

The output of power supply 1SUP, through PC
board fuse F2, provides the DC voltage which
powers the PC board regulators and the AC Power
ON LED. The DC input to the oscillator circuit is
obtained from a board regulator through high
voltage adjust knob 1POT. The oscillator circuit
outputs a low voltage, high frequency AC signal
through the low voltage cable socket 3SOC to
the applicator. The high voltage cascade located
in the applicator rectifies the AC voltage to DC
and steps it up to provide rated kV. The high
voltage adjust knob controls the level of output
voltage from the oscillator to the high voltage
cascade. In this manner, complete adjustability
from 0 to maximum kV of the applicator is
achieved.

> If JP4 is left covering (shorting)

If JP4 is left covering (shorting)

bother terminals, high voltage will

bother terminals, high voltage will
be on whenever AC power is

be on whenever AC power is

be on whenever AC power is
turned on. This could be hazard-

turned on. This could be hazard-

turned on. This could be hazard-
ous in some applications.

ous in some applications.

C A U T I O N

!!!!!

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