14
Chapter 2.  Installation and Wiring
Connection with model AUD300C/500C
Connect to the AUD300C or AUD500C as shown.
This device
14 15 16 17
WhiteWhite
Yellow  
(G)
Blue 
(F)
  Handling Precautions
•  AUD300C and 500C signal wires (blue and yellow) have polarity. Connect the 
blue wire to terminal 14 (F), and the yellow wire to terminal 15 (G). A reversed 
connection will damage the tube unit and cause a malfunction.
•  To extend the wiring, use 1.25 mm
2
 600 V PVC-insulated cable (IEC 60227-3), 
and keep the wiring no longer than 200 m.
Check of wiring between this device and model AUD300C or AUD500C
Necessary  tools:   tester 
Input impedance of 100 kΩ or more
To check that wiring to this device is correct, remove the tube unit from the 
AUD300C or AUD500C and measure the DC voltage between terminals F and G 
with the tester as shown below.
Connect the + tester probe (red) to terminal G (yellow lead wire) and the − tester 
probe (black) to terminal F (blue lead wire).
>> 
If the reading is between 160 and 220V DC, the leads are connected correctly. If 
a negative voltage is measured, terminals F and G are reversed.
Terminal G (yellow lead wire)
Terminal F 
(blue lead wire)
− tester probe (black)
+ tester probe (red)
Terminal Tester probe Voltage
F − (black) 160 to 220 V DC
G + (red)