Ransburg MGS Multi-Gun Source 76789, 77046 - Manual (Page 20)

CP-99-01
MGS Multi-Gun Source - Maintenance
Line voltage (90-264 VAC) is applied to input
terminals 8PL-1 and 8PL-3 of power supply 1SUP
through the user supplied exhaust fan and
conveyor interlocks, fuse 1FU and ON/OFF switch
ISW.
The output of power supply 1SUP, through Control
Unit PC board fuse F2, provides the DC voltage
which powers the Control Unit PC board regulators
and the AC power ON indicator. The Control Unit
PC board contains an oscillator circuit, the DC
input of which is obtained from high voltage adjust
potentiometer 1POT (when the Independent Gun
Control [IGC] board toggle switch is OFF) or from
the respective potentiometer on the IGC board
(when the IGC board toggle switch is ON). The
oscillator circuit outputs a low voltage, high
frequency signal to the high voltage multiplier
located in the spraygun (MGS 2001) or high voltage
module (MGS 2000C). The high voltage multiplier
rectifies the AC voltage to DC and steps it up to
provide rated kV. The high voltage adjust knob or
IGC board potentiometers control 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 spraygun is achieved.
When a gun trigger is pulled, the corresponding
reed switch (MGS 2001) or air flow switch (MGS
2000C) is activated. If the IGC board toggle
switch is ON, the IGC board potentiometer for that
gun is also activated. In addition, the door mounted
Control Unit PC board is energized. The
microcontroller on the MGS PC board determines
which gun trigger has been pulled and directs the
output from the door mounted control unit to that
gun. The microcontroller also locks out all other
guns so that high voltage cannot be activated on
another gun until the trigger on the present gun is
released. In this manner, high voltage output exist
at only one gun at a given time.
> The Troubleshooting Guide section requires
measurement of voltage potentials that can
cause SERIOUS BODILY INJURY
SERIOUS BODILY INJURY SERIOUS BODILY INJURY SERIOUS BODILY INJURY SERIOUS BODILY INJURY if prop-
er measuring procedures are not followed. For
this reason, proper troubleshooting should
ONLY
ONLY ONLY ONLY ONLY be accomplished with specific test
equipment by qualified-electronics technicians
or authorized ITW Ransburg representatives.
Before troubleshooting, ensure that the MGS unit
is plugged into a live outlet of the appropriate
voltage. All electrical measurements stated in the
Troubleshooting Guide section are nominal and
may vary as much as
+ /- 10% depending on the
test conditions and the test equipment used. Refer
to Figure 8 for location of parts called out in the
Troubleshooting Guide section.
THEOR THEOR THEOR THEOR THEORY Y Y Y Y OF OPERA OF OPERA OF OPERA OF OPERA OF OPERATION TION TION TION TION
See Figure 8 See Figure 8 See Figure 8 See Figure 8 See Figure 8
If improper operation is obtained, refer to the
Troubleshooting Guide section to locate the
specific problem. Proper troubleshooting should
ONLY be accomplished with specific test
equipment by qualified electronics technicians or
authorized ITW Ransburg representatives.
BENCH TESTING BENCH TESTING BENCH TESTING BENCH TESTING BENCH TESTING
Equipment Required: Equipment Required: Equipment Required: Equipment Required: Equipment Required:
Volt/Ohmeter Volt/Ohmeter Volt/Ohmeter Volt/Ohmeter Volt/Ohmeter
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