G340 TERMINAL WIRING:

IMPORTANT: When first testing the G320, connect ERR/RES (term. 5) to ENC+ (term. 7).
Please follow the next steps in the sequence they are given. 

STEP 1: ENCODER HOOK-UP

The encoder must be at minimum a 25 line-count digital quadrature encoder and must operate on a single +5VDC power 
supply. If the encoder supply current is more than 50 mA, use an external +5VDC supply. It may have an INDEX output, 
which will not be used. If it has differential outputs, use only the “+” phase outputs. 
IMPORTANT: Connect a 470-ohm 
resistor from TERM. 6 to TERM. 7 if an external power supply is used for the encoder.

(TERM. 6) ENC-  Connect the encoder power supply ground to this terminal. 
(TERM. 7) ENC+ Connect the encoder +5VDC to this terminal 
(TERM. 8) PHASE A Connect the encoder phase “A” to this terminal 
(TERM. 9) PHASE B Connect the encoder phase “B” to this terminal 

STEP 2: POWER SUPPLY HOOK-UP

Keep the power supply leads short and use the largest wire gauge that will fit in the terminals. If the lead length is more 
than 18” use a 1000 uF capacitor across the G340 power supply terminals. Make sure your power supply can provide the 
peak current the motor may draw. The power supply voltage must be between 18 VDC and 80 VDC. The actual voltage 
should not be more than 5 volts higher than the motor’s rated voltage. 

(TERM. 1) POWER GROUND Connect the power supply ground to this terminal. 
(TERM. 2) +18 TO 80 VDC Connect the power supply “+” to this terminal 

STEP 3: TESTING THE ENCODER

At this point the encoder should be tested for functionality. If you wish to monitor the POSITION ERROR test point with a 
voltmeter or oscilloscope, then remove the cover of the drive now. If you have a choice, pick the oscilloscope. 

The POSITION ERROR test point shows the difference between the command position and the actual motor position. 
When both are the same, the voltage will be +5VDC. For every count the motor is clockwise of the command position, the 
voltage will decrease by 0.04 volts. When it drops to 0.4 volts, the protection circuit takes over and resets the drive for 3 
seconds. While reset, the FAULT light is on. 

For counter-clockwise position errors the voltage will increase by 0.04 volts for every count until it reaches 9.6 volts when 
again the protection circuit takes over as before. 

VOLTMETER MONITORING: Place the red lead on the test point and the black lead on the large blue capacitor lead 
(GND) furthest from the main connector. Turn on the power supply. The FAULT light should be on for 3 seconds and then