Ransburg Serial Atomizer Module A11925-00 - Manual (Page 20)

LN-9256-07.4
Serial Atomizer Module - Maintenance
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The Serial Atomizer Module has no adjustable
components on the module. With the possible
exception of air leaks, there are no field repairable
items on the module. Troubleshooting a rotator
speed control problem generally consists of
isolating the problem system component and
replacing that component.
During troubleshooting, it is important to recognize
the automatic shutdown modes and consider the
circumstances which might cause them. Some
common system problems which cause the Serial
Atomizer Module to go to automatic shutdown are:
1. Bearing air supply pressure momentarily drops
below the required threshold when the system
air supply cannot maintain pressure during periods
of high air consumption.
2. Paint or solvent contamination in the rotator
causing blockage of the fiber optic speed feedback
signal.
3. Electrical noise on the transceiver output
causing over or under speed indications.
4. Overheating of the transceiver board due to
inadequate air flow of it's environment.
Figure 7 will assist in troubleshooting a majority of
these problems.
Test points 1 and 2 are speed feedback pulses (1)
and ground (2). The pulses should appear as an
evenly spaced square wave whose frequency is
proportional to the rotator speed. At a speed of 39
krpm the waveform frequency is 500 Hz (period of
2 msec.). The amplitude can vary since this test
point signal is 1/2 of a differential pair. It may vary
between 2 to 4 V.
TROUBLESHOOTING TROUBLESHOOTING TROUBLESHOOTING TROUBLESHOOTING TROUBLESHOOTING
Figure 6: Input from Transceiver Card Figure 6: Input from Transceiver Card Figure 6: Input from Transceiver Card Figure 6: Input from Transceiver Card Figure 6: Input from Transceiver Card