Tweco N7500 - Manual (Page 53)

Manual 89250890 8-5 TROUBLESHOOTING GUIDE
TROUBLESHOOTING GUIDE N7500
8.05 Control Box
Control Box
Problem Possible Cause Possible Remedy
No AC power
to Control Box
110/220VAC power to Control Box
NOT turned ON
Check connections and turn power ON. See "Table
3-2: Control Box Features" on page 3-2.
Disconnected AC Power Cable Connect AC Power cable
Defective AC Power cable
Repair/replace cable. See "9.04 110V Power Supply
Cable Assembly" on page 9-4.
Tripped ON/OFF Switch circuit
breaker
Turn AC power OFF, check for and repair fault, then
reset.
No DC “+”
power to Con-
trol Box
Power Supply Comm Cable not
connected or improperly connected
Connect Power Supply Comm Cable to Power Supply.
Review "Table 4-11: Standard Wiring Connections" on
page 4-6 and "Figure 4-10: Power Supply Comm.
Cable Pin Configuration" on page 4-5 for proper wir-
ing points.
No output
from Travel
System Power
Connection on
Control Box
Circuit breaker tripped
Check for and repair fault. Reset. See "Table 3-2:
Control Box Features" on page 3-2.
Defective power cable Check for fault. Repair or replace cable.
Defective power outlet on Control
Box
Replace outlet. See "Figure 9-1: Control Box PARTS"
on page 9-1.
No air flow
through
Control Box
when system
is activated
Shop compressed air is OFF,
regulator is closed or improperly
adjusted
Check shop air, check regulator at Control Box Air
In inlet. Turn shop air ON and adjust regulator to
operating psi.
WARNING
Do not exceed N7500 system max air pres-
sure.
Air solenoid is faulty
Replace air solenoid. See "Figure 9-1: Control Box
PARTS" on page 9-1.
Power Sup-
ply In/Out
Busbars cor-
roded, arcing,
overheating
DC cable connection is NOT
wrench tight
Tighten busbar connection wrench tight.
Table 8-6: Control Box Troubleshooting
AC POWER SUPPLY CABLE
PIN COLOR VOLTAGE
A WHT NEUTRAL
B GN GROUND
C BK LINE
Table 8-7: AC Power Supply Cable Pin Identification