Quincy Compressor 50093-103 - Manual (Page 39)

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! 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.
Auto/Demand - Optional
The QSVI 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 Dual 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 shutdown on time delay as
determined by the Demand-A-Matic controller.
Electrical System
A wiring diagram is included in the control panel on all
Quincy QSVI 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
controller.
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 QSVI 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 safety switch, solenoid and 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.
Indicators and Gauges
Main Power on Light - Indicates when power from the
main disconnect switch has been turned on and there is
live power at the vacuum pump control panel. This light
will remain on as long as there is power to the unit,
regardless of the position of the control selector switch.
! WARNING !
Always check power supply disconnect. The
Power-on light may be inoperable.
High Air Temperature Light - Indicates when the unit
has sensed an unusually high temperature in the
discharge air/fluid mixture. Unit has shut down. NEVER
turn the unit back on until the problem has been corrected.
Hourmeter - Indicates actual hours of operation. Used to
determine maintenance intervals.
Vacuum Gauge - Indicates the system vacuum in inches
of mercury (In. HgV) below atmospheric pressure
surrounding the vacuum pump.
Air Outlet Temperature Gauge - Indicates the
temperature of the air/fluid mixture as it discharges from
the vacuum pump. Normal reading is 180
°
F to 220
°
F.