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Figure 4A.2 Unit Screens - DOL Systems
Control Circuit Alarm
This will not shut down the pump in question
but instead is a notification that there is a loss of
communication between printed circuit boards
within the control panel. See Appendix A on
Control System for trouble shooting.
4A.4.3 System Alarms
Lag Unit Running Alarm (if enabled)
This alarm will activate if the last available vacuum
pump comes on. Press the alarm silence button
on the main display screen to silence the alarm.
If a lag condition remains, the "Red" indicating
light on the Main screen will remain on. Once the
lag condition is corrected, press the reset button
to turn off alarm light on display screen.
In the case of a duplex system, it will activate
when the second vacuum pump turns on based
on the signal from the vacuum transducer. In
the case of a multiplex system, the lag alarm will
activate when the last available unit is required to
come on. For example, in a quadruplex system,
if all four pumps are set to "AUTOMATIC", then
the lag alarm will trigger when the fourth unit
comes on. If on the same system, three (3) of
the four pumps are set to "AUTOMATIC" and the
other to "OFF " or "MANUAL", then the lag alarm
will activate when the third unit comes on. In the
event the lag alarm is persistent, check to see
if any leaks or valves are open downstream or
reduce the system load.
Lubricated Rotary Vane Laboratory Vacuum Systems
4A-4
Please note that the lag alarm may not be reset
if the lag pump is still running. This can happen
due to the run timer not having expired, even
though the lag vacuum level itself may be above
the alarm setting.
The Lag Alarm will activate if the vacuum
transducer signal circuit is lost or the transducer
malfunctions. Press the alarm silence button
on the main display screen to silence the alarm
(see Troubleshooting Section 5.0). The vacuum
level reading on the main display will read "ERR"
when this alarm occurs. The vacuum system will
continue to run off the backup vacuum switch.
Ambient Temperature Alarm
This alarm will activate when the temperature in
the room exceeds the set point. The touchscreen
will show an active alarm and record it in the
event log. The alarm remains latched until
the alarm condition is reset by the operator.
See Appendix A on Control System for trouble
shooting.
4A.4.4 Service Warnings
Service Due Alarm
The Service intervals and type of service are
preprogrammed into the control system. The
background of the wrench icon on the main
display screen toolbar will turn red when one of
these services are required. See Table 6.1 under
Maintenance.
4A.4.5 Next In Line Alternation (outside
normal function)
•
If the selector switch for one vacuum pump
is in the Automatic position and the other
pumps are not in the Automatic position
(Purge/Off or Manual or Off), the vacuum
pump in Automatic will operate as the lead
pump.
•
If at least two vacuum pumps are in
Automatic and the lead vacuum pump shuts
down due to a motor starter fault, the lead
4107 9021 88.01
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