♦
The switches are set in this manner so that if pump 1 (lead pump) cannot satisfy demand and the
vacuum level drops below 21"Hg, the lag pump (2) will start-up when the vacuum level reaches 19"Hg
and stops at 23” Hg.
♦
All multiplex systems are supplied with "Automatic alternation" and "Frequent stop/start protection"
unless otherwise specified.
♦
"
Automatic alternation
" allows the pumps to operate equally (even run time) by alternating each pump
whenever the pump(s) shut down. When alternation occurs, the "lead" pump becomes the "lag" pump
and the "lag" pump becomes the "lead" pump.
♦
"
Frequent stop/start protection
" is used to allow the pump(s) to operate a minimum amount of time.
The time period is factory-set at 10 minutes. This allows the pump(s) to warm up and eliminate frequent
starting of the pump(s) which can cause premature coupling failure and breakdown of electrical
components. The pump(s) will continue to operate after the vacuum level has been satisfied. If the
possibility exists that the pump could work with a closed suction, a relief valve must be installed to
prevent cavitation.
♦
If the pump(s) are not alternating and/or are frequent starting, one of the electrical components may be
defective. Contact the factory for more information.
SYSTEM ALARM CONDITIONS
The following is a description of how alarm conditions will affect the operation of the system.
♦
If
a
"Lag pump in operation"
alarm is installed in the panel, observe the following. Such an alarm is
usually only supplied with medical packages. The alarm consists of a warning light and an audible
alarm. The alarm will trigger when the "lag" pump starts up. The alarm will not affect the operation of
the system. The light will illuminate and the alarm will sound. The audible alarm can only be silenced by
physically (or remotely) pushing the ALARM SILENCE button. This will not stop the LAG PUMP ON
light from illuminating. The light can be reset by physically (or remotely) pressing the ALARM RESET
button.
Note: If the lag pump is still operating when the ALARM SILENCE or ALARM RESET buttons are
pressed, the alarm will continue to sound. The alarm will only reset if the lag pump is not running.
♦
"Transformer failure"
light (optional). Only installed if more than one control voltage transformer is
supplied. If the TRANSFORMER FAILURE light is illuminated, one of the transformers has
malfunctioned and the second one has picked up. As long as a back-up transformer is available, the
above alarm will not affect the operation of the system. If both transformers fail, the system will shut
down.
♦
"High temperature"
light. If the HIGH TEMPERATURE light illuminates, the affected pump will shut
down unless otherwise specified at time of purchase of the equipment. The back-up pump(s) will
continue to operate unless a high temperature (or other) alarm occurs in those pump(s).
♦
"Low level"
light (optional). If the LOW OIL LEVEL light is illuminated, the affected pump will shut
down. The back-up pump(s) will continue to operate unless a similar condition occurs in those pump(s).
MAINTENANCE
As you proceed in reading this section, it will become clear that the “Maintenance Schedule” for DVT
Vmax
oil-sealed liquid ring vacuum pump systems is quite minimal. The use of the service gauges will alert you
when service is required.
WARNING: Before attempting any maintenance such as changing the fluid, disconnect all power
from the system by switching off the main breaker or disconnect switch. This will prevent the
system from automatically starting from a vacuum switch.
Bearing Lubrication - Pump
The .25 – 20 HP Titan-series single-stage liquid ring vacuum pumps are installed with sealed bearings that
require no field lubrication.
The 25 – 40 HP Titan-series single-stage liquid ring vacuum pumps which are belt-driven, the 50 – 100 HP
Titan-series single-stage pumps and the 2 – 60 HP two-stage Titan-series pumps require lubricating every
3000 hours. Extreme operating conditions may require more frequent lubricating. Grease fittings are
located on the top of each bearing housing.
For Titan-series two-stage pumps 100 HP and up, please consult Factory.
Dekker Vacuum Technologies, Inc. – Vmax/13
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