AAON RQ SERIES, Manual

11 

Three Phase Series Variable Speed 
Drives 

Product Description  

The inverter drive has been developed 
specifically for the variable speed 
compressor. The drive will power the 
compressor, control the compressor running 
speed, provide compressor and drive 
protection and communicate with the master 
controller. The drive requires cooling and is 
typically installed in the unit near the 
compressor.  

Theory of Drive Operation  

The primary purpose of the drive is to 
convert the 60 Hz AC input voltage into a 
variable frequency, variable voltage output 
to power the variable speed scroll 
compressor. The drive conditions the AC 
input Voltage through a series of 
conditioning processes to arrive at the 
desired output. The drive first converts the 
AC input voltage into a DC bus. The DC 
voltage is then pulse-width modulated to 
replicate a sinusoidal current at the desired 
frequency and voltage. 

Nomenclature 

The model number of the drive includes the 
power rating and nominal voltage input to 
the drive. Figure 3 provides a complete 
explanation of all of the alpha and numeric 
characters in the drive model number.   

Temperature & Humidity 

Drive operating temperature range: 

 -20°C to 60°C 

 
Drive storage temperature range:  

-40°C to 85°C 

 
Maximum Relative Humidity: 95% 

Power On/Off 

Communication Setting 

The drive is designed to be used in a master-
slave configuration where the master is a 
unit controller.  
 
 

Electric shock hazard. Disconnect and 
lock out power before servicing. 
Discharge all capacitors before 
servicing.  

WARNING

Check the drive carefully before using it. 
Make sure that all wires are correctly 
and tightly connected. Improper 
operation may cause fire or injury to 
persons.   

Caution

The drive should use rated AC power 
supply: 50/60Hz, 380-480V on 
EV20XXM-KX-XXX models and 208- 
240V on EV20XXM-JX-XXX drive 
models. Wrong use of power supply 
voltage levels may cause drive to be 
damaged. User should check the power 
supply, drive model being used before 
powering on the drive When power off 
the drive, make sure to wait at least 10 
minutes to ensure that the drive is 
completely turned off. 

NOTICE