Class II Biological Safety Cabinets
Cause Corrective Action
Defective ECMS
motor speed
controller
• Check Voltage supply to the ECMS, check from DC supply that one pin must be 12
volt.
• If there is no voltage supplied to the ECMS, check the cable conection.
• If cable conection is fine, check voltage output of the DC power supply.
• If there is no DC Power supply output, the DC power supply is faulty and needs
replacement.
• If there is voltage supplied to ECMS, proceed to the next step.
• Check the display of ECMS whether or not there is any reading.
• If ECMS displays any value, try to turn the potentio to maximum and minimum to
check for response.
• If ECMS responds to the adjustment, check PWM output with the multimeter.
• If ECMS produces PWM output, ECMS is likely not defective.
• If ECMS does not produce PWM output, ECMS is defective and needs replacement.
• If ECMS does not respond after adjustment attempt with the potentio, ECMS is
defective and needs replacement.
• If ECMS does not display any value, ECMS is defective and needs replacement.
• When the standby mode is turned on, the ECM blower should work at a lower
speed. If the ECM blower increases in speed (measured or through displayed value)
or drops lower than low than the expected speed, the ECMS is defective and need
to be replaced.
Figure 4-5
Figure 4-3
Figure 4-6. ECMS
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