Shellab SCO2W-2 - Manual (Page 17)

17
TROUBLESHOOTING
CAUTION: Extreme caution must be exercised any time access is made into areas housing electrical
components. Repair, replacement or adjustment of components in these areas must only be done by qualified
technicians familiar with electrical circuitry and the operation of the chamber.
Always make a visual inspection of the incubator and control console when troubleshooting. Look for loose or
disconnected wires or tubing, which may be the source of the trouble.
NOTE: IF BREAKERS TRIP REPEATEDLY, OR FUSES BLOW REPEATEDLY, CALL QUALIFIED SERVICE
PERSONNEL.
TEMPERATURE
Temperature too high
1/ controller set too high-see section 5.3
2/ controller failed on
– call Customer Service
3/ wiring error – call Customer Service
Display reads "HI" or "400"+
probe is unplugged, is broken or wire to sensor is broken – trace wire from
display to probe; move wire and watch display to see intermittent problems
Chamber temp spikes over set point
and then settles to set point
recalibrate – see section 5.4
Temperature too low
1/ OTP too low – see section 5.8.E
2/ controller set too low – see section 5.3
3/ unit not recovered from door opening – wait for display to stop changing
4/ unit not recovered from power failure or being turned off – incubators will
need 24 hours to warm up and stabilize
5/ element failure
– see if heating light is on; compare current draw to data
plate
6/ controller failure
– confirm with front panel lights that controller is calling
for heat
7/ OTP failure
– confirm with front panel lights that it is operating correctly
8/ wiring problem – check all functions and compare wiring to diagram in
section 10.0, especially around any areas recently worked on
9/ loose connection
– check shadow box for loose connections
Display reads "LO"
1/ sensor is plugged in backwards – reverse sensor wires to controller
2/ if ambient room temperature is lower than range of unit – compare set
points and ambient temperature to rated specifications in section 9.0
Unit will not heat over a temperature
that is below set point
1/ confirm that fan is moving and that amperage and voltage match data
plate
– check fan motor motion in shadow box and feel for air movement in
chamber
2/ confirm that set point is set high enough ,turn OTP counterclockwise and
see if heating light or safety light comes on
3/ check connections to sensor
4/ check calibration
– using independent certified reference thermometer,
follow instructions in sections 5.4 and 5.8
Unit will not heat up at all
Section
9