Nordson Mesa Fulfill, Customer Product Manual

Page: 35 / 66

Fulfill

Retrofit for Mesa Melters
31
Part 1121938_02
2013 Nordson Corporation
Refill PCA Troubleshooting Diagnostic Instructions
NOTE: Refer to Appendix A, Retrofit Refill System With Nordson Level Sensor, for updated
information.
Perform the following steps, in order, to either isolate the problem within the
PCA board or to eliminate the PCA board as a cause. These tests should
only be performed by personnel qualified to work on high voltage circuits.
1. Verify input power is reaching the PCA. Measure line voltage across the
input side (side of the fuse closest to the input connectors J1 and J2) of
fuses F1 and F2. The input voltage should be between 100 − 240 VAC.
If input voltage not present, correct input power.
2. Verify that the 24 VDC power supply on the Refill PCA board is working
by measuring the voltage between XT1 pin ”24V” and XT1 pin ”COM”. It
should be 24 VDC (
+
/
−
5%). If not 24 VDC, verify fuses are not blown. If
fuses have been blown, replace fuses. If fuses blow again, replace
Refill PCA. If fuses OK but 24 VDC not present, replace Refill PCA.
3. Check to make sure the DIP switch settings have not been changed.
SW1 DIP switch settings: M1 should be OFF; M2 should be ON.
4. Make sure the timer potentiometers are set as expected:
FAULT potentiometer adjustment range: 5 to 115 seconds (60
seconds at 12:00 position),
DELAY potentiometer adjustment range: 1 to 119 seconds (60
seconds at 12:00 position),
AIR (optional pre‐vibrator) potentiometer adjustment range: 0 to 20
seconds (10 seconds at 12:00 position).
5. Make sure the Refill PCA is enabled by verifying that the ”ENA” LED
close to the membrane panel connector (X1) is illuminated. If not, press
the ENABLE button on the membrane panel to enable the Refill PCA. If
the ”ENA” LED does not turn on with the membrane panel, the
membrane panel or PCA may be bad. With a piece of wire, briefly touch
X1 pin 1 to X1 pin 2 (the membrane tail will need to be unplugged to
perform this test). If the ”ENA” LED illuminates after this test, replace
the membrane panel. If not, then replace the Refill PCA.
6. To ensure that the level sensor signal is getting to the Refill PCA with the
level sensor calling for adhesive, verify that there is 24 VDC (
+
/
−
5%)
between XT1 pin ”SIG” and XT1 pin ”COM”. If not, repair the level
sensor cable, recalibrate level sensor, or replace level sensor.
7. To ensure that the Refill PCA fill output is working correctly with the level
sensor calling for adhesive and after waiting the DELAY time duration,
verify that 24 VDC (
+
/
−
5%) is applied to the fill control output (XT2 pin
”FILL” measured to any ”COM” pin). Verify with the level sensor is NOT
calling for adhesive that the fill control output is 0 to 0.5V.
If the problem has not be isolated to this point, replace the Refill PCA and/or
membrane panel.