Leviton EZ-MAX - Wiring with an External Power Supply

Z-Max Advanced Programming & Systems Design Guide rac00-sdg
Revision A:11/2005 Page 123
Wiring with an External Power Supply
When needed, an external class 2 power supply can be used to supply power to Low
Voltage devices connected to the low voltage inputs. When this is required, wire the
system by following the diagram below.
Figure 8: Using an External Power Supply
You must consider the following when using an external power supply:
• Use the external supply for +24V (or other required device) and common to the
devices
• Any return from a device which is connected to a switch input must not exceed
+24VDC.
• Connect the common from the external supply to the common of any switch input
• Use the device output (Control Signal) to the "IN" terminal of the respective switch
input
• Use the "OUT" terminal from the switch input for device feedback, like a low
voltage switch LED
• WARNING DO NOT connect the +V of the external supply to any of the +24V
terminals of the relay panel. This will nullify the Class 2 rating of the power run.
IN
OFF
+24
OUT
IN
OFF
+24
OUT
External
Power
Supply
+24VDC typ.
Device
Device
Power +V
Common
Optional LED
Optional LED
Control Signal
+24VDC or 0-10VDC
Depends on Device
Control Signal
+24VDC or 0-10VDC
Depends on Device
COM
COM
COM
COM
Cabinet
Common
Terminals