Quincy QMB Series, Instruction Manual

1 

QMB/T

®

 Control Operations 

 
This manual describes the microprocessor control for the QMB/T series of Air Compressors. 
 
The decal at the right shows the control 
layout for the electronic control panel. 
 
The primary controls are on the right 
hand side of the panel, with the selected 
item being displayed on the LED digits 
in the top window. 
 
The LED lamps in a vertical column, 
show the selected display parameter 
and/or any alarm conditions. 
 
On applying system power the LED 
status lights will blink and the numeric 
display will show the version number of 
the software code installed.  The system 
will be ready to run with the 'POWER' 
lamp on (showing that the control board  
has power) and the 'SYSTEM PRESSURE' LED will be lit showing the pressure on the numeric display. 
 
NOTE: A flashing '----' on the digit display, accompanied with an LED on the left, signifies a faulty 
sensor, either the pressure transducer or the temperature probe. 
 
A 

FAST 

blinking LED indicates that the labeled function has been tripped; an over-pressure condition or 

motor overload or High Air Temperature (HAT) trip. 
 
A 

SLOW 

blinking LED indicates that the Separator Differential Pressure (D.P.) switch has been tripped.  

A 

STEADY 

LED, along with a message blinking on the display, indicates a service time-out.  The 

controller is programmed with recommended service intervals on the fluid filter and the air filter.  These 
filters should be checked and serviced when convenient.