InstallatIon
HPR400XD Auto Gas  –  806160  3-33
Examples of input circuits
Output from 
CNC/PLC
External relay 
(AC or DC)
1. Relay interface
+24 VDC (See note 4 on page 3-31)
HPR
Power 
ground
2. Optocoupler interface
CNC/PLC
+24 VDC
HPR
Power 
ground
Transistor-output 
optocoupler
12V-24 VDC
CNC/PLC
+24 VDC
HPR
Power 
ground Power 
ground
Active-high drive
3. Amplified-output interface
Note:   The external relay’s life may be improved by adding a 
metallized-polyester capacitor (0.022µF 100 V or higher) 
inparallel with the relay contacts.