Steris SYSTEM 1E, Maintenance Manual

Page: 46 / 179

3-8
764333-675
below 14.5 mA, an abort is called (Alarm: "UV LAMP
BELOW 14.5 mA". ).
Event 2 – Printer starts to print header, COMP1 and
SOL1 are energized.
Event 3 – Test #1, A/D Converter Test: If power
supplied to control is within limits, cycle continues
to
Event 4 . If test fails, an alarm occurs and cycle
aborts (Alarm: " A/D CONVERTER FAULT" ).
Event 4 – Test #2, Inlet Water Temperature Test:
Control energizes SOL4, closing V5 and SOL5,
diverting incoming water past TC3 directly to drain.
This test runs for a minimum of 20 seconds and up
to a maximum of 240 seconds. If temperature exceeds
43°C, cycle progresses to
Test #3 . If temperature
measured is <43°C, the test fails and an alarm occurs
(Alarm:
"INLET TEMP. <43 DEG" ) and cycle aborts.
The printout indicates the water temperature in the
event of a failure.
Test #3, UV Intensity Test: Once the water
temperature reaches 43°C, the control checks the UV
intensity. If the intensity is greater than 15.0 mA, the
cycle progresses to
Event 5 . If the intensity is less the
15.0 mA, the control continues to monitor water for
up to 10 minutes. If intensity remains below 15.0 mA
following monitoring time, the control aborts the
cycle. (Alarm:
"UV INTENSITY TIMEOUT". )
Intensity is monitored for the duration of the cycle.
If intensity drops below 14.5 mA the control aborts
the cycle (Alarm:
"UV LAMP BELOW 14.5 mA" ).
Event 5 – Test #4, Fill Time Test: SOL4 remains
energized, keeping V5 closed. SOL5 is de-energized
while SOL7 is energized, thus allowing water to fill
the chamber. During the first 20 seconds of fill, PT1
is monitored; the water pressure is stored as the FP
(Fill Pressure) variable.
The chamber continues to fill until LS3 reads open or
until 300 seconds has elapsed. SOL7 is then
de-energized. If the fill time exceeds 300 seconds, the
test fails, an alarm occurs (Alarm:
"FILL TIME >
5 MIN." ) and the cycle aborts. If the test passes, the
cycle continues to Event 6 .
Event 6 – Test #5, Pressure Transducer Test: SOL4 is
de-energized for one second, then re-energized. P1
energized (turned ON) for four seconds, then
de-energized (turned OFF). For 25 seconds, chamber
pressure is allowed to stabilize. PT1 is then
monitored for 60 seconds. The average value is stored
as the FZ (Fill Zero) variable. Note that the pressure
should be greater than 0 since the PT1 is reading the
head pressure due to the water level in the unit.
After the 60 seconds has elapsed, the software looks
at the FZ and FP values. If FP <5.85 psi or FZ > 1.95
psi, the test fails and an alarm occurs (Alarm:
"PRESSURE XDUCER FAULT" ), and the cycle
aborts. The printout indicates the pressure
transducer reading in psi in the event of a failure. If
test passes, the cycle continues to
Event 7 .
Event 7 – Test #6, Circulation Pressure Test: The
control energizes P1. After 30 seconds, the P1 pump
continues to run and the control monitors the
pressure transducer for a full 60 seconds. The values
measured are averaged and stored as CP (Circulation
Pressure).
The control makes a calculation using variables CP
and FZ, such that, CP<FZ + 1.073 psi, the test fails
and an alarm occurs (Alarm:
"CIRCULATION
PRES. LOW" ) and the cycle aborts. The printout
indicates the value for CP in the event of a failure. If
test passes, cycle continues to
Event 8 .
Event 8 – Test #7, Thermocouple Test: The
temperatures read by TC1 and TC2 are compared. If
within 3°C of each other, cycle continues to
Event 9 ;
if >3° C, test fails, and an alarm occurs (Alarm:
"THERMOCOUPLE FAILED" ) and the cycle aborts.
The printout indicates the values for TC1 and TC2 in
the event of a failure.
Event 9 – Test #8, Circulation Valve Test: The control
energizes SOL3, closing V6. If the pinch valve is
working properly, the pressure transducer no longer
sees pressure from the circulation pump.
The control waits 10 seconds, then monitors and
averages the pressure transducer PT1 for 20 seconds
and stored value CZ (Circulation Zero). The values
for CZ and CP are compared. If the difference is
>0.975 psi, cycle continues to
Event 10 . If the
differences are less than values specified, an alarm
occurs (Alarm:
"CIRC. VALVE FAULT" ), and the
cycle aborts. The printout indicates the measured
difference in the event of a failure.
Event 10 – Test #9, Heat Rate Test: The control
de-energizes SOL3, opening the V6 and allows five
seconds for chamber fluid to stabilize. LS3 is checked
for a chamber full condition. If not full, P1
de-energizes and SOL7 energizes until LS3 senses a
chamber condition.
Once full, the control energizes P1 and HTR1, and
de-energizes SOL7. After, TC1 is read and the value
stored in memory. After heating for 60 seconds more,
TC1 is read. If temperature has increased by 1°C,
cycle continues to
Event 11 . Otherwise, the control
heats for up to 120 seconds more, measuring the
temperature increase after 60 seconds and then after
120 seconds. If temperature increases by 1°C per
minute, the cycle continues with
Event 11 ; otherwise,
the test fails and an alarm occurs (Alarm: "HEAT