Document: 333D012G
5-18-2007
- 30 -
Troubleshooting
Here are some suggestions based on our experience with the use and misuse of biological safety cabinets.
When a smoke test indicates that there is air flowing from the interior of your cabinet into the surrounding
room-
1.
Make sure that the building exhaust connection is operating at the proper static pressure and exhaust flow.
2.
Verify that cabinet down flow is within specification.
3.
Check to see if anything is blocking part of the intake or rear wall perforated.
4.
Check for room cross drafts caused by vents, open windows, and high traffic through doorways. Eliminate the
source of the cross draft.
5.
The exhaust filter maybe loaded with particulate if the cabinet has been in service for some time.
Decontaminate the cabinet and replace the filter.
When there is low down flow within the work area and through the exhaust filter-
1.
Check the incoming line voltage. Low voltage may cause the blower to operate at a slower-than-designed
speed. You may be able to compensate by adjusting the blower speed control clockwise until proper velocity is
reached. The control is located inside the light canopy on the left side.
2.
The filters maybe loaded with particulate if the cabinet has been in service for some time. If the blower speed
control is turned up to maximum voltage and the airflow is still low, decontaminate the cabinet and replace the
filters.
If there is no down flow within the work area-
1.
Make sure the cabinet is plugged in and the blower switch is turned on. The Green indicator below the button
should be lighted.
2.
Check the wiring connections between the electrical panel and the cabinet to see if they are connected properly.
3.
See if the light is working. If it is, then turn the blower switch off and let the cabinet set for ten minutes. This
allows the motor time to reset itself, if it had overheated.
NOTE: If the motor restarts and there is a whining
sound, the motor bearing maybe causing the motor to overheat.
4.
If these solutions do not correct the problem, or if the blower failed to start after the rest period, then the speed
control, blower motor, or capacitor is defective. A qualified electrician, using the wiring diagram in the
Appendix of this manual, can by-pass the speed control to determine if it is defective.
If one (or both) of the electrical outlets does not function-
1.
Make sure the outlet switch is in the on position. The Blue indicator below the button should be lighted.
2.
Check the reset button on the Ground Fault Circuit Interrupter outlet. If the GFCI has tripped out, press the reset
button. The outlets are also protected by a self-resetting thermal circuit breaker. A qualified electrician, using
the wiring diagram in the Appendix of this manual, can check this breaker.
Summary of Contents for SG403A
Page 35: ...Document 333D012G 5 18 2007 34 Appendix ...
Page 38: ...Document 333D012G 5 18 2007 37 Dimensional Drawing Standard Configuration SG403A ...
Page 39: ...Document 333D012G 5 18 2007 38 Dimensional Drawing Standard Configuration SG603A ...
Page 41: ...Document 333D012G 5 18 2007 40 Interior View Exterior View Cable port plug not shown ...
Page 42: ...Document 333D012G 5 18 2007 41 Ladder Schematic SG403A ...
Page 43: ...Document 333D012G 5 18 2007 42 Ladder Schematic SG603A ...
