Troubleshooting
4-8
Part 1618871−01
2020 Nordson Corporation
Power Supplies
See Figure 4-6 and refer to Table 4-3. Use the Power Supply LEDs to help
diagnose problems.
Table 4-3 Power Supply LEDs
LED Function LED
Color
LED State Fault Correction
PS1 − 600 W 24 Vdc
AC OK Power Green Normal: ON
Fault: OFF
Check input power to PS1 blue and brown wire
100−250 Vac 50/60 Hz.
Check fuse L1A and L2A.
Check disconnect switch.
Check input power to controller L1A red and L2A blue
100V−250 Vac 50/60 Hz.
Replace PS1.
DC OK Power Green Normal: ON
Fault: OFF
Check output voltage from PS1 red and black wire
+23.5 V to +24.5 Vdc
Remove connector P4 from backplane. If DC OK LED
turns ON refer to troubleshooting for backplane on
page 4-6.
Remove connector P4 from backplane. If DC OK LED
remains OFF, replace PS1.
PS2 − 120 W 24 Vdc
DC OK Power Green Normal: ON
Fault: OFF
Check input power to PS2 black and white wire
100−250 Vac 50/60 Hz.
Check fuse L1B and L2B.
Check disconnect switch.
Check input power to controller L1B black and L2B
white 100V−250 Vac 50/60 Hz.
Check output voltage on PS2 red and black wire
+23.5 V to +24.5 Vdc.
Remove red wire +24 V from terminal block. If DC OK
LED turns ON, check short in loads.
Return red wire +24 V from terminal block and check
loads.
Open +24 V 4A fuse block. If DC OK LED turns ON,
check P4.
Remove PLC power X6 and UL. If DC OK LED turns
ON, check PLC.
Remove eWON power. If DC OK LED turns ON,
check eWON.
Remove relay board power J7−5. If DC OK LED turns
ON, check relay board.
All loads removed. If DC OK LED remains OFF,
replace PS2.
Return all loads to circuit except the faulted load and
check if DC OK LED turns ON.
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