Labconco FreeZone 4.5 Liter Freeze Dry Systems 77510 Series - Manual (Page 26)

Chapter 4: Using Your Freeze Dryer
Product Service 1-800-522-7658 22
Alarms
A number of unusual events may occur during a lyophilization procedure that can
adversely effect the operation of the Freeze Dryer. If an event occurs, the alarm
indicator will flash and the beeper will sound.
The beeper will automatically mute itself after one minute. The specific alarm can
be identified by pressing MENU. Pressing MENU multiple times will display
multiple alarms if they have occurred. The following “out of specification”
conditions will initiate an alarm:
Power Failure
If a power failure occurs during a Freeze Dry process, the vacuum control valve
will allow air to bleed into the Freeze Dryer System. If the failure is of a short
duration and the collector does not warm excessively, when power is restored the
Freeze Dryer will restart and resume operation of the refrigeration and vacuum
systems. If the power failure lasts for a longer duration and the collector warms
above safe limits, when the power is restored, the Freeze Dryer will not
automatically restart. This prevents melted sample from being drawn into the
collector and prevents liquid from being sucked into the vacuum pump.
When power is restored, the alarm indicator will flash and the alarm beeper will
sound. When the MENU button is pressed the display will show:
Press and hold SELECT for five seconds until the error message is cleared from
the display.
Line Voltage Out of Range
If the voltage supplied to the Freeze Dryer varies beyond allowable limits, the
alarm will be activated. When an alarm occurs, press MENU and the display will
show:
The alarm will self-cancel when the proper voltage is restored. The high and low
alarm points are preset at the factory to correspond to the normal allowable voltage
variations based on the nominal voltage specified for the freeze dryer. Some
models may be operated outside the normal voltage limits. See Appendix C.
If necessary, the high and low alarm points may be adjusted for these models. See
Chapter 8.
POWER FAIL
HOLD SELECT TO CLEAR IT
LINE VOLTAGE ERROR