Envirco BSC - Manual (Page 17)

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4.1.5 Digital control circuit
(a) The EnvircoBiosafety Cabinet has utilized the latest microprocessor control technology to
control and inspect the Biosafety’s Cabinet’s function. It is simple to operate and is user
friendly while providing a high degree of reliability for diagnostic functions.
(b) Connect the cabinet to the recommended electrical outlet.
(c) Turnthe keyclockwise to power the equipment. The display will illuminate, then go dark and
repeat three times. At the same time, a buzzer will sound off three times.
(d) When you power on, the unit will automatically start a self-check to test its integrity and
safety performance. When the front panel is too high, it will alarm and at the same time the NO
SAFETY on the Vertical Front Display (VFD) will light. At that time, it will be OKAY to adjust
the height of the front panel. If the supply and exhaust filter cannot reach the specified setting,
the equipment will emit an audible-optic alarm. It will notify the user to replace the filter to
protect the user’s safety.
(e) After the unit performs its self-inspection, the equipment will go into a standby mode and
wait for the operator to press the keypad for the desired operation.
(f) After pressing the power button, the default display for supply air differential pressure will
be zero.
(g)The fan motor can be activated by the switch on the control panel. The fan motor mark on
the VFD will light and the motor will start up slowly. It will reach a normal operation speed in
10-15 seconds.
(h) When the stop switch is activated for the fan motor to stop, the fan motor indicator on the
VFD will go dark, the motor will stop running and will be stopped in 10 -15 seconds.
(i) A grounded outlet can be controlled by the corresponding button on the control panel,
allowing the maximum 5A current. If there are two outlets,the switches will control both of
them simultaneously.
(j) The light control is an integrated system. The operator can choose to either turn on the
daylight lamp or the UV light.
NOTE: The UV lamp and the glass door are inter-locked, preventing the UV lamp
from becoming energized.
(k)The digital controller can regulate the overall speed of the fan motor and compensate for
line voltage fluctuation. The equipment can operate normally when the input voltage is
between 100-130 AVC.
(l) The wind volume is shown on the keypad, monitored by the pressure sampling of the
microprocessor. When the air volume is lower than 20% (the normal value), it will buzz three
times every 5 seconds. If the air volume is higher than 20%, it will alarm four times every 5
seconds.