Instructions / Assembly

Low Voltage Control Wiring Control Overview
Page 26
Control Wiring Termination
This section gives instructions for terminating all types of low voltage inputs.
• Leviton recommends minimum 18AWG stranded wire for all low voltage wiring.
• Terminate all control wiring directly to the terminal blocks on the printed circuit
board. Use a small 1/8-in. flat screwdriver on these terminals.
• Terminal blocks are 2-part terminals and can be removed for ease of termination.
When reinstalling them make sure they are plugged in the correct direction
according to the way they were wired.
• All control wiring shall be considered Class 2.
• Use control wire type and size as specified below:
Figure 14: Control Wire Type and Size
Input Trigger-What Determines an “ON”
Each of the low voltage inputs can be triggered by either the supply of voltage or a
connection to common. When voltage is supplied to an input indicating a change of
state, we call this “pulling up the input” or “active high.” When a connection to
common triggers the input, causing a change of state, we call this “pulling down the
input” or “active low.”
By default, all inputs are active high (that is receiving voltage to trigger). Active High
inputs must not exceed a nominal +24VDC and must be above +9vdc. Active Low
inputs must connect to the same common at the same potential as the cabinet.
To change from an active high input to an active low input, the polarity jumper must
change position. There are several illustrations which show the location of these
jumpers.
Input Power Requirements
The relay cabinet has a finite amount of power which it can supply to connected
devices. This topic is discussed in detail in “Power Considerations for Control Systems”
in Appendix A. Please make sure that you do not exceed the amount of available
peripheral power, or damage to your relay cabinet or connected devices may occur.
Connector Type Wire Size and type Torque
Switch Inputs 14-24 AWG, Stranded 2 in-lb.