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5.3 OTHER FAULTS
5.3.1 Ground Fault Interrupt (GFI) Trip
Description – A GFI measures the difference in
current flow between the hot and neutral lines of a
circuit. Normally both are identical; however, if there
is current leakage to ground from the hot line, the GFI
senses the imbalance and trips.
The typical trip point of a GFI is 4 to 6 mA, and since
this is a very small level of imbalance, it will require
component isolation to locate the cause.
Establish if the GFI trips as soon as the unit turns on,
or if it occurs in cycle. If trip occurs when turned on, it
may be necessary to isolate components one at a time.
When doing so, turn the unit ON to see if the GFI trips.
If trip occurs in cycle, the trip may be occurring when
a specific component is energized; if so, use the service
mode/hand terminal to manually activate individual
components until the source of trip is located.
Action:
1. Verify proper operation of GFI using ground fault
tester – if OK, continue with component isolation,
otherwise, replace GFI.
2. If trip occurs in cycle – use service mode/hand
terminal to operate components individually until
trip source is located.
3. If trip occurs when powered up – isolate individual
components manually until fault is located.
5.3.2 Water Spills from SYSTEM 1E Processor
Action:
Check the following items.
1. Drip pan full of water?
2. Is chamber filling?
a. Faulty LS3 – repair.
b. SOL5 or SOL7 leaking – repair.
c. Are instruments loaded incorrectly – reload.
d. Is water pressure >60 psi – reduce.
e. Back pressure in the drain – repair.
f. Faulty CK2, CK3 – repair.
g. Header block – replace lid.
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