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Check the voltage and motor current, they
should be within the specifications for the
motor. Standard motors have a 1.15 S.F.
(Service Factor).
Note:
This test should also be performed
under normal system operating conditions.
DANGER: HIGH VOLTAGE!
Lethal shock hazard present.
USE EXTREME CAUTION!
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After 15-30 minutes of operation, check pump
operating temperature, which should be in the
140° to 185° F range. Some smaller units may
run cooler.
SHUT DOWN PROCEDURE
To stop the pump system follow the procedure as lined out below.
Push the STOP button, or turn switch to the OFF position. The inlet check valve will prevent fluid from the
system being sucked back into the inlet manifold.
Note: If inlet piping could be under vacuum for an extended period of time without the pump
running, inlet piping should be vented to atmosphere.
Note: Close the seal fluid isolation valve and the pump inlet isolation valve during extended periods
of storage or when transporting. Open valves before starting system.
SEQUENCE OF OPERATION
The following sequence of operation is a description of how the
Vmax
oil-sealed vacuum pump system
should operate. The description is general to cover simplex to multiplex (more than one pump) systems. It
is assumed that all start-up procedures have been followed. Ensure that pump reservoirs are filled with oil
(See “Start-up Procedures”, page 5). Make sure that the seal fluid isolation valve is in the open position. If
unsure about the function of one of the electrical controls mentioned below, see the "Electrical Controls"
section (page 10) for a description of the component. If any of the below do not occur, see the "Trouble-
shooting " section (page 12).
Once the power connection to the system has been made, the following should occur:
♦
If disconnects or circuit breakers are installed on the control panel, and are turned to the ON position,
the system will be energized. If POWER ON indicating lights are installed on the panel, the lights will be
illuminated.
♦
If any other lights are illuminated, see the "Trouble-shooting" section (page 12).
♦
If HAND-OFF-AUTO selector switches are installed and are turned to the HAND mode, the pump(s) will
immediately start. If PUMP ON light(s) are installed on the panel, they should light up to indicate pump
operation. We suggest that each pump be tested ("bump started") in the HAND mode initially to check
rotation of the pump. When facing the drive end of the pump, the correct rotation is clockwise. When in
HAND mode, the pumps will run continuously unless an alarm condition is triggered. If such a condition
occurs, see the "Trouble-shooting " section.
♦
When the HAND-OFF-AUTO selector switch is placed in the AUTO mode, the pumps will operate from
vacuum switches (if installed). In multiplex pump systems, each vacuum switch is set with a differential
as well as an offset relative to the next switch. The switches should not be set identically. The
differential is usually between 3 to 6” Hg. For details on setting the vacuum switches, see the
“Accessories and Protective Devices” section on page 11. Below is an example for a duplex system.
The differential for each switch is 4"Hg, the offset between the two switches is 2"Hg.
PUMP
PUMP ON
PUMP OFF
Pump 1 (lead pump)
@ 21"Hg
@ 25"Hg
Pump 2 (lag pump)
@ 19"Hg
@ 23"Hg
Dekker Vacuum Technologies, Inc. – Vmax/13
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