10
7. Auto/Demand - Optional
The QSVB vacuum pump with Auto-Demand controls accommodate external control signals from an optional
Quincy Demand-A-Matic multiple vacuum pump controller. With the selector switch in the “Local” mode, the
vacuum pump will operate exactly as described in the previously mentioned Auto description. In the “Remote”
mode, the vacuum pump’s vacuum switch is bypassed in favor of the Demand-A-Matic multiple vacuum pump
controller. The vacuum pump will start, draw vacuum, unload and shut down on time delay as determined by the
Demand-A-Matic controller.
!
WARNING
Never assume it is safe to work on the unit because it is not operating. It may be in
the automatic stand-by mode and could restart at any time. Follow all safety
instructions in the “Preparing for Maintenance” or “Service” chapters.
8. Electrical System Description
A diagram of the electrical system is shown in the parts manual sent with the vacuum pump. A wiring diagram is
also included in the control panel on all Quincy QSVB vacuum pumps.
NOTE:
Due to continuing product improvements and updates, it is suggested that the wiring diagram included in the
control panel be used when servicing the electrical control.
NOTE:
Standard drive motors are open drip proof with a maximum ambient temperature rating of 104
°
F. They are
not suitable for salt laden, corrosive, dirty, wet or explosive environments.
The QSVB series vacuum pumps utilize 460V incoming power through an across-the-line magnetic starter. A
transformer in the control panel reduces this voltage to 120 VAC for the various controls on the unit. These controls
include the selector switch, vacuum switch, timer, high air temperature probe, solenoid and the various indicator
lights. Other incoming line voltages are available as options. The vacuum pump is provided with a NEMA 1
enclosure. Optional enclosures include NEMA 4.
Summary of Contents for QSVB Series
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