Ransburg 9040 Service Manual page 32

9040 Low Voltage Control Unit Kit- Maintenance
The DC input to the oscillator is interlocked with
2PL terminals 1 and 2, such that the oscillator
will not function unless terminals 1 and 2 of 2PL
are connected together. In this manner, high
voltage to the applicator is controlled as follows:
1. When pressure signals are supplied to
the pressure switches, the switch
contacts close connecting 2PL-1 and 2
together, thereby providing voltage to
automatic applicators.
2. Contact closure of a programmable
controller output, robot output, or some
other user supplied device connected to
terminals 2PL-1 and 2 will activate high
voltage at the applicator.
3. For testing and troubleshooting, board
jumper JP4 connects 2PL-1 and 2
together, thereby providing high voltage
output (see "PC Board Test Jumper"
previously discussed in this section).
Bench Testing
Before going through the trouble of a
>
complete bench test, jumper JP4 on the
main PC board to trigger the high voltage
and see if the suspected problem goes
away. If it does, replace the high voltage
trigger device (flow switch, pressure
switch, PC contact, etc.) or repair the
internal wiring of the control unit connect-
ed to the trigger device, and test again. If
the problem does not go away then pro-
ceed with a bench test.
29
NOTE
Equipment Required: Volt/
Ohmmeter
This section provides
troubleshooting the control unit when improper
operation is obtained and the problem has been
traced to the control unit. Proper troubleshooting
should ONLY be accomplished with specific test
equipment, by qualified electronics technicians, or
authorized Ransburg representatives.
! W A R N I N G
> The troubleshooting procedure outlined
in "Troubleshooting Flow Charts" requires
measurement of voltage potentials that
can cause SERIOUS BODILY INJURY if
proper measuring procedures are not
followed. For this
troubleshooting should
accomplished with specific test equipment
by qualified electronics technicians or
authorized Ransburg representatives.
Before troubleshooting, ensure that the control
unit is plugged into a live outlet of the appropriate
voltage. All electrical measurements in the
"Troubleshooting Flowchart" are nominal and may
vary as much as +/- 10% depending on the test
conditions and the test equipment used. Refer to
"Figure 4 - Main PC Board" and "Figure 9 -
Troubleshooting Diagram" for location of parts
called out in "Troubleshooting Flowcharts".
For bench testing, jumper JP4 should be used to
trigger the high voltage output (see "PC Board Test
Jumper" previously discussed in this section).
a flow chart for
reason, proper
ONLY be
CP-11-01