TM 10-4610-241-24
TO 40W4-13-42
Table 3-1. Direct Support Troubleshooting - continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
BACKWASH PUMP ASSEMBLY - continued
WARNING
High voltages in this equipment can cause serious injury or death. When applying power
during a test, take proper measures to ensure safety of personnel. Never work on
electrical equipment unless there is another person nearby who is familiar with the
operation and hazards of the equipment.
Step 6. Disconnect cable assembly from pump motor and check it for continuity (Paragraph 2-16).
a.
If cable is open, repair cable assembly. Refer to Paragraph 3-7.
b.
If cable is not open, repair centrifugal pump pump. Refer to Paragraph 3-8.
Step 7. Check for continuity through control circuit. Make additional point-to-point continuity checks as required
to isolate fault to a specific component:
NOTE
To check continuity through K2 contacts, it is necessary to close contacts by holding
handle on side of relay to the UP position.
J10(C)
-
J8(P)
J9(P)
-
J9(L)
P9(P)
-
P8(P)
P9(L)
-
P8(L)
P9(C)
-
P8(C)
P9(W)
-
P8(W)
TB5(7)
-
TB-1 (Timer)
J8(W)
-
K2(A2)
TB-5 (Timer)
-
J9(W)
J8(L)
-
J8(C)
J1(N)
-
A1
J1O(N)
-
A1
K1(A1)
-
K1(A2)
(Required value is 90-120 ohms)
TB-4
-
J9(C)
3-92
